Hello Art, JJ and all that are interested. I posted a link on the previous post, can you please let me know if you are able to download these files.
These are .wav files with a .pdf extension, so just change the extension to .wav and you should be able to listen. I suggest headphones, as these were recorded on my laptop mic, so might not be the best quality. I will try my Shure mic next, with a preamp to get correct recording levels. I think that will sound better, and will post that also, but this is a start.
I recorded with my horn guitar eight feet away from the laptop mic. You will hear mostly drivers/horns, but also the acoustic guitar itself, as you can tell from string noise, especially on the finger picking.
The finger picking recording is pretty mellow, as well as the slow chord progression recording. I am trying to highlight the sound of the guitar more than anything with these recordings.
The third recording is the same chord progression, but obviously a little faster and stronger. Nothing seriously rocking yet, but I do go a little harder and faster for fun. I mean it is an acoustic guitar. Oh wait, it is not a standard acoustic guitar, it is a Folded Horn Acoustic Guitar, 117 DB peak! 🤣
My playing is OK, not great, so keep that in mind. I have other songs I want to send later, open tuning chords up and down the neck, to get a better feel for how this sounds, with all the strings ringing from first fret position, to twelfth fret position.
I can hear some distortion, but not terrible. I likely have some work to do on the piezo fit, needs to have even pressure on every string of course. Plus the magnetic pickup sounds good, but tone controls seem to be more critical on this pickup.
Let me know what you think, let me have it! Thanks! Joe
These are .wav files with a .pdf extension, so just change the extension to .wav and you should be able to listen. I suggest headphones, as these were recorded on my laptop mic, so might not be the best quality. I will try my Shure mic next, with a preamp to get correct recording levels. I think that will sound better, and will post that also, but this is a start.
I recorded with my horn guitar eight feet away from the laptop mic. You will hear mostly drivers/horns, but also the acoustic guitar itself, as you can tell from string noise, especially on the finger picking.
The finger picking recording is pretty mellow, as well as the slow chord progression recording. I am trying to highlight the sound of the guitar more than anything with these recordings.
The third recording is the same chord progression, but obviously a little faster and stronger. Nothing seriously rocking yet, but I do go a little harder and faster for fun. I mean it is an acoustic guitar. Oh wait, it is not a standard acoustic guitar, it is a Folded Horn Acoustic Guitar, 117 DB peak! 🤣
My playing is OK, not great, so keep that in mind. I have other songs I want to send later, open tuning chords up and down the neck, to get a better feel for how this sounds, with all the strings ringing from first fret position, to twelfth fret position.
I can hear some distortion, but not terrible. I likely have some work to do on the piezo fit, needs to have even pressure on every string of course. Plus the magnetic pickup sounds good, but tone controls seem to be more critical on this pickup.
Let me know what you think, let me have it! Thanks! Joe
Joe,
I don't have a Google drive account, so can't say anything about the files.
That said, .wav files are supported on Google drive, no need to change the extension.
Are the recordings another acoustic guitar playing through the horns, or the completed Folded Horn Acoustic Guitar only?
I don't have a Google drive account, so can't say anything about the files.
That said, .wav files are supported on Google drive, no need to change the extension.
Are the recordings another acoustic guitar playing through the horns, or the completed Folded Horn Acoustic Guitar only?
Art - I really want you to hear this, and get your opinion, I will find another way to get a link on here, stay tuned. Just left as pdf for reasons on my end.
Still thru a guitar, going slow, but I do something every week. I am still traveling every week and working too much - wah! 🤣
I don't want to do YouTube until I get my second patent on this guitar anyway, so the only good news about the USPTO being so slow is I am still ahead of them! I check for progress with the USPTO every night after work. It should have been six months, it is ten months now.
Let's see what JJ says about the files that I gave him access to today (expires in two days JJ). 🙏 😎 I know you guys will tell me the truth. If you like it great, if not, tell me why! I have been listening to what I recoded recently thru headphones, I def am getting the good bass and high sparkle that I want. Now maybe the quality thru the laptop mic is not good enough, and I can make improvements, but I am on the right track. I just hit 22K hits on diyAudio, thanks all! Joe
Still thru a guitar, going slow, but I do something every week. I am still traveling every week and working too much - wah! 🤣
I don't want to do YouTube until I get my second patent on this guitar anyway, so the only good news about the USPTO being so slow is I am still ahead of them! I check for progress with the USPTO every night after work. It should have been six months, it is ten months now.
Let's see what JJ says about the files that I gave him access to today (expires in two days JJ). 🙏 😎 I know you guys will tell me the truth. If you like it great, if not, tell me why! I have been listening to what I recoded recently thru headphones, I def am getting the good bass and high sparkle that I want. Now maybe the quality thru the laptop mic is not good enough, and I can make improvements, but I am on the right track. I just hit 22K hits on diyAudio, thanks all! Joe
Forgo to mention also that the midrange sounds good, but I think about the same (put way more power!) Ian telling me they sound clean live was a great relief, I don't want to talk myself into anything, I need other people to listen. Hitting 120 dB (at horns only) was also pretty cool, I measured it live with a dB meter while he was playing. So my point is: my output data shows more bass, same mid and stronger highs, again all with much more power, as you guys have seen, and I am hearing that, makes sense.
Plus Art's Hornresp output looked pretty similar, but mine showed highs lasting longer...hmm.
I am a listening guy, but I am slowly but surely turning into a data guy also, I am impressed with how much they match, a great combo in my opinion.
Plus Art's Hornresp output looked pretty similar, but mine showed highs lasting longer...hmm.
I am a listening guy, but I am slowly but surely turning into a data guy also, I am impressed with how much they match, a great combo in my opinion.
Your playing is better than I can do. To me it sounds like a guitar; couldnt tell which part was the horn speaker, which part was additional pickup from the guitar you played mixed in, being in the same room. On the Blackbird one I definitely could catch the bass response you've been talking about.
I thought you had something like a Zoom or Tascam handheld recorder on hand; I'd think the mics in those would be better than the Laptop mic, which I heard getting some distortion on the 3rd selection. Plus, these record in stereo, which may let someone hear where the input acoustic guitar is - say, positioned on the left - and where the output horns are; placed on the right.
Something like this https://www.ebay.com/itm/165459240568 should allow you to easily get the laptop and its mic out of the performance recording. The mics that come built into it should work just fine for what you want to do, which eliminates the "which mic should I use?" factor. 24 bit, 96kHz ought to do it for a distortion free recording.
There's a zillion different models of these things to pick from; just get the one you're most comfortable with and can get to you in the most reasonable time. Doesnt have to be the most expensive one out there.
You might also try a recording with your USB measurement mic, if you can select it as input to whatever recorder software you're using. Still, it would be in mono, so harder to distinguish what part of the sound is guitar being played, what part is the horn speakers amplifying that sound.
I thought you had something like a Zoom or Tascam handheld recorder on hand; I'd think the mics in those would be better than the Laptop mic, which I heard getting some distortion on the 3rd selection. Plus, these record in stereo, which may let someone hear where the input acoustic guitar is - say, positioned on the left - and where the output horns are; placed on the right.
Something like this https://www.ebay.com/itm/165459240568 should allow you to easily get the laptop and its mic out of the performance recording. The mics that come built into it should work just fine for what you want to do, which eliminates the "which mic should I use?" factor. 24 bit, 96kHz ought to do it for a distortion free recording.
There's a zillion different models of these things to pick from; just get the one you're most comfortable with and can get to you in the most reasonable time. Doesnt have to be the most expensive one out there.
You might also try a recording with your USB measurement mic, if you can select it as input to whatever recorder software you're using. Still, it would be in mono, so harder to distinguish what part of the sound is guitar being played, what part is the horn speakers amplifying that sound.
Thank you JJ! I am happy that you can hear the improved bass response, data shows that is the strongest improvement. The highs are there also with data, but not as significant, maybe harder to hear on a recording of this quality, but I can hear that when I play.
It "sounds like a guitar" is what I expected. I have the power, I just don't want to degrade the sound, and I am not doing that. If you heard this with 3" drivers and horns not covered, you would know what I mean, that made the guitar sound "not so great". I want that great acoustic guitar sound WITH POWER. I am hearing that now.
I assure you that the drivers and horns are what you are hearing, from a distance of eight feet from mic, they blow the guitar away, actually from any distance. I will get more data to show that. When I measure the horn dB it is 120, and guitar is 80 dB. but of course they blend together with this unusual instrument, easily 80% of what you are hearing is drivers/horns, based on my experience.
I will do another recording with horns off, guitar only, then horns on, will be night and day, this was just a start. I need to spend more time on the build now, but I will do both.
I will look for a link to give you tomorrow Art, I think Dropbox may work, and I don't think you need that to download, stay tuned.
I posted another photo of soundboard progress. The #4-40 screws are delicate, need to drill straight, need to self tap straight, need correct location. Must screw in slowly and not break screws. The thread in the Maple is so small, if it F...ed up: toast, no repair will work. Having (48) screws is great, a few bad apples will not ruin the pie, I have none yet.
I thought about using the measurement mic, but bought a USB mic, will see how that goes.,
BTW - I was listening to Heartsfield tonight as I worked, anybody know them, they are great. They were voted #1 band in Chicago back in the day.
Acoustic and electric guitars, four part harmonies, rocking hard, great songs, I have been listening to them for many years, just saying.
Anybody else want to comment? I have many hits, please jump in. If you like it great, if not so much, that is OK also, love to hear all opinions. Thanks! Joe
It "sounds like a guitar" is what I expected. I have the power, I just don't want to degrade the sound, and I am not doing that. If you heard this with 3" drivers and horns not covered, you would know what I mean, that made the guitar sound "not so great". I want that great acoustic guitar sound WITH POWER. I am hearing that now.
I assure you that the drivers and horns are what you are hearing, from a distance of eight feet from mic, they blow the guitar away, actually from any distance. I will get more data to show that. When I measure the horn dB it is 120, and guitar is 80 dB. but of course they blend together with this unusual instrument, easily 80% of what you are hearing is drivers/horns, based on my experience.
I will do another recording with horns off, guitar only, then horns on, will be night and day, this was just a start. I need to spend more time on the build now, but I will do both.
I will look for a link to give you tomorrow Art, I think Dropbox may work, and I don't think you need that to download, stay tuned.
I posted another photo of soundboard progress. The #4-40 screws are delicate, need to drill straight, need to self tap straight, need correct location. Must screw in slowly and not break screws. The thread in the Maple is so small, if it F...ed up: toast, no repair will work. Having (48) screws is great, a few bad apples will not ruin the pie, I have none yet.
I thought about using the measurement mic, but bought a USB mic, will see how that goes.,
BTW - I was listening to Heartsfield tonight as I worked, anybody know them, they are great. They were voted #1 band in Chicago back in the day.
Acoustic and electric guitars, four part harmonies, rocking hard, great songs, I have been listening to them for many years, just saying.
Anybody else want to comment? I have many hits, please jump in. If you like it great, if not so much, that is OK also, love to hear all opinions. Thanks! Joe
Joe, to be comparable, you would need to measure levels at the same distance, if you measure an acoustic guitar near the sound hole it will be a lot more than 80 dB.
Heartsfield was a great band, I provided sound for them many times during the late 1970s and early 1980s, and bought their truck, the Enterprise from them around 1980. Here's a picture of my 1979 horn system with the Enterprise.
Heartsfield had bought the Enterprise from Jefferson Starship. Lots of memories wrapped up in that ride!
Art
Heartsfield was a great band, I provided sound for them many times during the late 1970s and early 1980s, and bought their truck, the Enterprise from them around 1980. Here's a picture of my 1979 horn system with the Enterprise.
Heartsfield had bought the Enterprise from Jefferson Starship. Lots of memories wrapped up in that ride!
Art
Whoa, that's really something! I gotta ask; what was the time to setup/stack everything, from when you first arrived? It looks like that was a lot of work.
Load in and set up time depends on the venue and crew. Setting up and wiring the stacks could be done in under 30 minutes, but generally I'd want to schedule load in about 2 hours before sound check to allow plenty of time for micing the stage, ringing out the monitors, and tuning the house system.
Yes I hear you Art about the distance, will do that, and will check out my USB mic, hopefully tonight, plus I will get you that link.
Wow, that is some serious power Art, love it! My horns are, shall we say, on the small side compared to that, but I only have so much room. 🤔
Heartsfield eh? In addition to being one of my all time favorite bands, they had great sound. You could always hear the four parts harmonies equally, great guitars...fiddle...I posted a picture of Heartsfield Collectors Item, recorded on Columbia, very tight, fantastic album. In fact all their albums are great. I bet I have seen them at least a dozen times, who knows Art, maybe you did the sound for one of the shows I was at...small world. Anyway, recommend this music to anybody that has not heard them before.
One night after their set, they closed with I think three Rolling Stones songs, Phil Lucafo blew the roof of with his guitar playing, I think maybe it was Rip This Joint. Of course Perry sang his heart out...as usual, what a great band. I remember thinking I like their version better than the Stones version. 🤣
I can remember nights when we pulled out a few acoustic guitars, and had a group of people singing along, harmonizing...the voices would drown out the guitars, so much fun, just another reason why I want to build this guitar. When getting drowned out, acoustic guitars (no amp) tend to get beaten a bit too hard, hurts the sound.
Wow, that is some serious power Art, love it! My horns are, shall we say, on the small side compared to that, but I only have so much room. 🤔
Heartsfield eh? In addition to being one of my all time favorite bands, they had great sound. You could always hear the four parts harmonies equally, great guitars...fiddle...I posted a picture of Heartsfield Collectors Item, recorded on Columbia, very tight, fantastic album. In fact all their albums are great. I bet I have seen them at least a dozen times, who knows Art, maybe you did the sound for one of the shows I was at...small world. Anyway, recommend this music to anybody that has not heard them before.
One night after their set, they closed with I think three Rolling Stones songs, Phil Lucafo blew the roof of with his guitar playing, I think maybe it was Rip This Joint. Of course Perry sang his heart out...as usual, what a great band. I remember thinking I like their version better than the Stones version. 🤣
I can remember nights when we pulled out a few acoustic guitars, and had a group of people singing along, harmonizing...the voices would drown out the guitars, so much fun, just another reason why I want to build this guitar. When getting drowned out, acoustic guitars (no amp) tend to get beaten a bit too hard, hurts the sound.
Art - see previous post, can you download this link from Dropbox?
Since you are a Heartsfield guy, do you remember Greystone Fox? Michael Flynn? He used to jam with Heartsfield, he was my guitar teacher when I was a young lad.
I remember trying to get into Heartsfield and Greystone Fox concerts, but I was too young, they would not let me in, had to be 21...
I believe JC Hartsfield grew up in the south, but moved to Chicago, he lived in my hometown for a while, and we were all huge Heartsfield fans, I mean all my friends loved them.
Anyway go easy on me, but you know I love the truth. These recordings are laptop mic, I can do better. If you can get this link, I can then send all kinds of recordings to you and JJ, get feedback, see where I can improve...let's make the acoustic guitar rock! Oh wait you already did that 🤣
Let's make the acoustic guitar rock with horns inside!
Since you are a Heartsfield guy, do you remember Greystone Fox? Michael Flynn? He used to jam with Heartsfield, he was my guitar teacher when I was a young lad.
I remember trying to get into Heartsfield and Greystone Fox concerts, but I was too young, they would not let me in, had to be 21...
I believe JC Hartsfield grew up in the south, but moved to Chicago, he lived in my hometown for a while, and we were all huge Heartsfield fans, I mean all my friends loved them.
Anyway go easy on me, but you know I love the truth. These recordings are laptop mic, I can do better. If you can get this link, I can then send all kinds of recordings to you and JJ, get feedback, see where I can improve...let's make the acoustic guitar rock! Oh wait you already did that 🤣
Let's make the acoustic guitar rock with horns inside!
I tired the pdf files and had a problem, the previous link now has wav files, can you download these Art??
Joe,
I took a listen, didn't hear anything too unusual, sounded like a guitar in a lively room.
Can't determine any level or tone difference added by the horn speakers from the recording of both.
Art
I took a listen, didn't hear anything too unusual, sounded like a guitar in a lively room.
Can't determine any level or tone difference added by the horn speakers from the recording of both.
Art
Thanks much Art, great to hear that, my goal as I have stated before, is to make the acoustic guitar rock, and hoped I could keep the great acoustic sound, but with much more power.
When I first designed this guitar, I could not know how it would sound, until it was built and tested. Who could know how this very unusual instrument would sound. Too much bass? Maybe even too much highs from the 3" full range speakers? Horn honk, which I still have not ever heard (some say from voice with many peaks). Not enough power? Totally unknown!
Great to see I now have links I can send to Art, JJ and anybody else interested. I assure you, what you heard on every recording was 80% horns, maybe more, none of those recording were acoustic guitar without horns (or waveguides).
Now that I have learned more about recording levels, I will provide guitar links with horns and without, same distance from mic. Rocking hard on the horns of course recorded too high, clipped and distorted. Recording at the correct level worked well. What I will do next is record the horn guitar and the acoustic guitar, which will be nowhere near as loud, recorded at the same level and distance. Any other suggestions? Thanks! Joe
When I first designed this guitar, I could not know how it would sound, until it was built and tested. Who could know how this very unusual instrument would sound. Too much bass? Maybe even too much highs from the 3" full range speakers? Horn honk, which I still have not ever heard (some say from voice with many peaks). Not enough power? Totally unknown!
Great to see I now have links I can send to Art, JJ and anybody else interested. I assure you, what you heard on every recording was 80% horns, maybe more, none of those recording were acoustic guitar without horns (or waveguides).
Now that I have learned more about recording levels, I will provide guitar links with horns and without, same distance from mic. Rocking hard on the horns of course recorded too high, clipped and distorted. Recording at the correct level worked well. What I will do next is record the horn guitar and the acoustic guitar, which will be nowhere near as loud, recorded at the same level and distance. Any other suggestions? Thanks! Joe
Well, you could play your pink noise source through the horn guitar (REW will generate it on your laptop headphone output) and record it as well. Same level as whatever the horns end up at when recorded, with another acoustic guitar / amp as input. Being able to download it and hear what that sounds like, we could also analyze it as a sound file.
Thanks JJ (Joe), I will do that! Not right away, many things to do, but great point.
The attachment is for anybody interested, but it also has some new info. I will record more tonight with Folded Horn Acoustic Guitar at recording level, then turn it off to hear standard guitar, for comparison. I like to listen next day for a fresh hear, so will not post until tomorrow, or maybe next weekend, stay tuned.
PC and USB mic are going well now, I like this setup. Really happy that the links works, so I plan on providing much to listen to in the future.
I have learned that horns are like humans, nobody is perfect! 🤣 If you look at slide #4, you will see the worst peak on my FR is approx. 80-90 Hz. sticks out so bad. I highlighted the frets on the bottom E string that are "ringing" too much, excessive vibration. It might sound good on an electric guitar distorted solo, but for an acoustic guitar, I do not like it. I consider this to be a flaw in my horn design and build.
The good news is you can only hear it on the magnetic pickup. Piezo only, totally gone. And it can only be heard if the magnetic pickup is maxed out at 9 or 10, so I can EQ it out, but I still don't like it. Thankfully it is only fret 5 thru 9 on the low E string, which does not get played much on an acoustic guitar. But if you are doing finger picking or bar chords, thar she blows!
Art - what do you think? How can I correct this? Unusual for horns? Hey, I only have some much room to work with! 🤔
The other good news is I tested every damn fret on every string, the rest are all clean! My biggest fear for this horn guitar was I would get some sort of undesirable sound everywhere, does not happen, whew! Clean!
I am in the enviable position of being able to learn about great audio engineering for the first time, and learn I will.
The soundboard finally has all screws in place, strong, strong, no worries there, I don't need any data (but I have it). I can feel strength with my hands, easily will hold. Mechanical Engineering and Engineering Design is my strength. I can pull that soundboard off in 10 minutes flat, and have it back on in 15 minutes, that issue is closed.
I have the tuners (Grover) holes in the neck. I should have CNC those holes, and the soundboard screws in both pieces, live and learn. I zigged where I should have zagged on a few soundboard holes, so not pretty, but will have no affect on sound.
I listened to the horns straight into my ears while I was playing, sitting on the floor, big time power, almost too much!
That leads me to directivity and off axis concerns, wow that is big. I am considering horn extensions. Hard wood, that follows the body and angles it forward at 90 degrees. Maybe a small base that is screwed into the body, and an extension that locks in with some well fitted slots, stay tuned.
Shop music for this weekend has been Delbert McClinton, The Band, Eat A Peach and Heartsfield. Thanks all! Please keep the comments coming, I love to hear all opinions! Joe
The attachment is for anybody interested, but it also has some new info. I will record more tonight with Folded Horn Acoustic Guitar at recording level, then turn it off to hear standard guitar, for comparison. I like to listen next day for a fresh hear, so will not post until tomorrow, or maybe next weekend, stay tuned.
PC and USB mic are going well now, I like this setup. Really happy that the links works, so I plan on providing much to listen to in the future.
I have learned that horns are like humans, nobody is perfect! 🤣 If you look at slide #4, you will see the worst peak on my FR is approx. 80-90 Hz. sticks out so bad. I highlighted the frets on the bottom E string that are "ringing" too much, excessive vibration. It might sound good on an electric guitar distorted solo, but for an acoustic guitar, I do not like it. I consider this to be a flaw in my horn design and build.
The good news is you can only hear it on the magnetic pickup. Piezo only, totally gone. And it can only be heard if the magnetic pickup is maxed out at 9 or 10, so I can EQ it out, but I still don't like it. Thankfully it is only fret 5 thru 9 on the low E string, which does not get played much on an acoustic guitar. But if you are doing finger picking or bar chords, thar she blows!
Art - what do you think? How can I correct this? Unusual for horns? Hey, I only have some much room to work with! 🤔
The other good news is I tested every damn fret on every string, the rest are all clean! My biggest fear for this horn guitar was I would get some sort of undesirable sound everywhere, does not happen, whew! Clean!
I am in the enviable position of being able to learn about great audio engineering for the first time, and learn I will.
The soundboard finally has all screws in place, strong, strong, no worries there, I don't need any data (but I have it). I can feel strength with my hands, easily will hold. Mechanical Engineering and Engineering Design is my strength. I can pull that soundboard off in 10 minutes flat, and have it back on in 15 minutes, that issue is closed.
I have the tuners (Grover) holes in the neck. I should have CNC those holes, and the soundboard screws in both pieces, live and learn. I zigged where I should have zagged on a few soundboard holes, so not pretty, but will have no affect on sound.
I listened to the horns straight into my ears while I was playing, sitting on the floor, big time power, almost too much!
That leads me to directivity and off axis concerns, wow that is big. I am considering horn extensions. Hard wood, that follows the body and angles it forward at 90 degrees. Maybe a small base that is screwed into the body, and an extension that locks in with some well fitted slots, stay tuned.
Shop music for this weekend has been Delbert McClinton, The Band, Eat A Peach and Heartsfield. Thanks all! Please keep the comments coming, I love to hear all opinions! Joe
Aieee! Yes. If it were me, I'd start that way. As I attempted to explain many replies ago, the little drivers for each horn need something to push against - and that would be the trapped air within the little cavity behind them. Else, in their floppy, unrestrained state they wont be able to dissipate as much power. Doing that might even rid you of the 89-90 Hz issue.
I'd just assumed the back of the guitar was a solid plate and you were covering / uncovering the front, when you were talking about the covered-uncovered experiments you were doing. Before you assembled the top onto it. Now I see the picture of the back, with the driver rear cavity wide open.
There's lots of experiments you can do if totally sealed doesnt work out. You could;
1. Have the speaker rear chamber ported to the back of the guitar. The port could be a tube, a slot or an array of many small holes.
2. You could cut a channel connecting the speaker rear chamber with the second chamber, to get more air volume behind the drivers, if the existing volume happens to be too tight. And the third chamber; it's there and you could use its additional volume if necessary. Even with electronics in there too.
3. You could make it vent up underneath the soundboard. Might give lots of feedback, but who knows how it'd behave until you try it, play with reversing the driver's polarity in the amplifier connection.
4. You could make it vent to the back (or front) from the second or third chamber, with that connecting channel cut between them.
5. You could make a narrow slot port exit between the horn mouths, though that would change the milled structure design a bit.
Starting with that chamber sealed is just the beginning; there's all kinds of things to try. You need a team working on it, to arrive at the best design before too long.
Thanks JJ, I like the options, and using the space in the chambers the electronics will be in, need to experiment with that for sure.
I normally do have the back of the speakers/guitar covered. I just removed that for an experiment, powerful, but def affects the horn sound.
And yes, when I said I listened to the horns covered and uncovered, I was referring to the large chamber divider on top of the entire horn, that is where the difference is amazing. Basically going from no horns at all to sealed horns entirely. I did not get around to recording anything last night, so will be next weekend.
Also I got rid of the low frequency ringing, I believe it was the small table I had the guitar on, bad idea, I think the entire small table moves! It is good to know where the extreme weak spot is, thankfully that seems to be the only one, and I can get rid of it! Joe
I normally do have the back of the speakers/guitar covered. I just removed that for an experiment, powerful, but def affects the horn sound.
And yes, when I said I listened to the horns covered and uncovered, I was referring to the large chamber divider on top of the entire horn, that is where the difference is amazing. Basically going from no horns at all to sealed horns entirely. I did not get around to recording anything last night, so will be next weekend.
Also I got rid of the low frequency ringing, I believe it was the small table I had the guitar on, bad idea, I think the entire small table moves! It is good to know where the extreme weak spot is, thankfully that seems to be the only one, and I can get rid of it! Joe