Just playing with the idea of building a tapped horn with the same Fane woofer (black line) and turning the horn into bass reflex instead of closed back (grey line). This looks like a pretty good match - and I always wanted to try out a tapped horn as well. Another project to the list...
Attachments
Trying out Clio pocket and some basic crossover. This is the on axis response (red) and phase (minimum selected in Clio, green) after some EQ. In room, 1/6 octave smoothed and no gating, in room at around 70 cm.
I definitely need to start building the second one🙂
I definitely need to start building the second one🙂
Hi Jaroslav, I really like your project, I "casually" have a pair of GRS PT 6816 and I hope to clone it soon. My works with the beautiful horns you printed for me are progressing and I hope to report them soon on Diyaudio.
Congratulations and happy holidays.
Congratulations and happy holidays.
I forgot, what is at 1KHz the Sensitivity (2.83V @ 1m) of your Ikea Kallax MEH ?
Regards
Guglielmo
Regards
Guglielmo
Hi Guglielmo, glad to hear that! I can send you the 3D model if you wish. Unfortunately, I have not measured the sensitivity yet, maybe next week.
Just keep in mind that this shape came out of curiosity and special needs to fit my shelf (not the Kallax, but the same depth) between two wardrobes in my working room. I will have to measure the directivity pattern more precisely, the first crude measurements suggest that these should be fit for the purpose but are a bit beamy in the HF (as expected). I will experiment a bit with some 3D printed phase plugs as others suggested, it should help also with straightening the FR in the top end. Because to get them this straight, EQ is needed.
All that said, even a single one is so enjoyable in its intended place that I will start building the second one soon (and finish the first one properly, too🙂 )
And I started thinking about some bass modules to fit nicely between the pair, most probably sealed boxes with one or two 12" woofers.
Just keep in mind that this shape came out of curiosity and special needs to fit my shelf (not the Kallax, but the same depth) between two wardrobes in my working room. I will have to measure the directivity pattern more precisely, the first crude measurements suggest that these should be fit for the purpose but are a bit beamy in the HF (as expected). I will experiment a bit with some 3D printed phase plugs as others suggested, it should help also with straightening the FR in the top end. Because to get them this straight, EQ is needed.
All that said, even a single one is so enjoyable in its intended place that I will start building the second one soon (and finish the first one properly, too🙂 )
And I started thinking about some bass modules to fit nicely between the pair, most probably sealed boxes with one or two 12" woofers.
Hello,
may this experience can help with the GRS?
https://www.diyaudio.com/community/threads/acoustical-notch-filter-for-tpl-150.359480/page-4
may this experience can help with the GRS?
https://www.diyaudio.com/community/threads/acoustical-notch-filter-for-tpl-150.359480/page-4
Yes, that is exactly what I am after. Some sort of acoustic filter / phase plug to get rid of the +- 10 kHz peak. I also saw some similar for Neo8, which the GRS is a clone of.
I am thinking about options, while this form is pretty compact, I could fit three more conventionaly looking MEHs (say 80x35) to build a L - C - R system for matrix listening.
The planar driver has a narrow vertical directivity anyway and I really like how the Fane Sovereign 8-225 works together with it.
The matrixed Single Stereo Speaker with 3FE22s (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-6884821) works so nicely, so it encourages me to experiment further with this concept on a larger scale.
But first, I will set up the Hydra clones (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-6952116) as the sides and the F1 clone (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-7067167) as the center channel on the shelf.
The only thing is I need to figure out how to create the matrix with the DSP I have available.
The planar driver has a narrow vertical directivity anyway and I really like how the Fane Sovereign 8-225 works together with it.
The matrixed Single Stereo Speaker with 3FE22s (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-6884821) works so nicely, so it encourages me to experiment further with this concept on a larger scale.
But first, I will set up the Hydra clones (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-6952116) as the sides and the F1 clone (https://www.diyaudio.com/community/...-little-full-range-driver.379277/post-7067167) as the center channel on the shelf.
The only thing is I need to figure out how to create the matrix with the DSP I have available.
Measure once, print twice🙂 I realized that it is wrong before printing, but at least I managed to confirm this shape would fit. It is most probably a bad shape anyway. I plan to try the "micro waveguide" (on each hole) style as well.
I should still build the second one. And the first larger symmetrical prototype will be used as center for the LCR testing.
I should still build the second one. And the first larger symmetrical prototype will be used as center for the LCR testing.
Attachments
I revisited this little box (and the Aura F1 clone with 3FE22s as the second channel) and made a simple 1st order crossover at around 800 Hz (22 uF in series with the tweeter and 1.56 mH in series with the woofer). I also pulled out my Chinese Bouyurange 300B amplifier.
I am shocked. Even though the MEH needs EQ in the mids to make it more even and with low end roll off above 100 Hz, I am getting very enjoyable sound. Must be the 300B amp... adding something I really like. Detailed 3D soundstage, I am hearing things I have never noticed before.
I need to find out if it is the amp or speakers (or the room arrangement?). I also need to equalize both and add some bass (mono for now).
I am shocked. Even though the MEH needs EQ in the mids to make it more even and with low end roll off above 100 Hz, I am getting very enjoyable sound. Must be the 300B amp... adding something I really like. Detailed 3D soundstage, I am hearing things I have never noticed before.
I need to find out if it is the amp or speakers (or the room arrangement?). I also need to equalize both and add some bass (mono for now).
I'm headed out the door right now and can't look it up, but GRS makes a planar that sits halfway between the size of the NEO3 and the NEO8.
If it was $200 it would be killer for something like this, but at $60 (iirc) it's just dead-simple to make a really solid Unity horn.
Basically, most planars struggle to play down to 1500Hz, but the GRS can reliably play down to 1khz or even 700Hz.
On the downside, there's very little output above 10khz. I've long wondered if a pair of the GRS NEO3 clones could be used to replace one of the larger planars.
If it was $200 it would be killer for something like this, but at $60 (iirc) it's just dead-simple to make a really solid Unity horn.
Basically, most planars struggle to play down to 1500Hz, but the GRS can reliably play down to 1khz or even 700Hz.
On the downside, there's very little output above 10khz. I've long wondered if a pair of the GRS NEO3 clones could be used to replace one of the larger planars.
A small update. For some reason, the midbass on the Kallax Syn was inverted (most probably a wiring mistake - cable or inside) and I was getting an awful null. Fixed that by swapping the wires on the connector. I also installed MiniDSP 2x4 HD and since the midbass is more sensitive than the planar tweeter, I added two low shelf filters. This hybrid crossover seems to work really fine, I just need to tune the mono bass unit crossover a bit more now.
Unfortunately not, since I have finished the SPL Runt clones (https://www.diyaudio.com/community/threads/2-way-synergy-inspired-by-spl-runt.378456/latest), I am using them exclusively. I only remember that the polars of the planar were not too great. They only worked well within ca 30 degrees.
Does the vertical directivity of these narrow naked planars improve once mounted in a horn with say an 80x50 profile?
Re-reading my own post, I realize that the driver I'm describing in my post is the exact driver that Pelanj used 🙂
NE08 = 7.88" x 3.5"
Horn mouth/baffle polar frequency: c = 10^6/(a*b)
a = wall angle in deg
b = mouth width (or height) in inches
c = -6 dB frequency
metric = (2.54*10^628.57")/(a*b) in cm~7.94" height
Hmm, flat baffle = 10^6/(180*7.88) = 705 Hz though using the published 700 Hz = 7.94" height, so not sure which is the more accurate; regardless, throat height = 10^6/(80*700) = ~17.28"
throat width = 10^6/(50*700) = 28.57"
At a glance then, 'improve' is your call.
I am thinking about making a V2.
This time, with the half size planar and 3D printed horn. I really like the shape and I need some relatively smallspeakers for a workshop. The asymmetrical shape would be beneficial, since there is not much room for toe-in.
And this time, the horn itself will be a bit larger to really fit into a 1x1 Kallax shelf. The 3D model will be a bit of a challenge for me and will have to be printed in 4 or 5 pieces. Maybe with a space for the Extron amps.
This time, with the half size planar and 3D printed horn. I really like the shape and I need some relatively smallspeakers for a workshop. The asymmetrical shape would be beneficial, since there is not much room for toe-in.
And this time, the horn itself will be a bit larger to really fit into a 1x1 Kallax shelf. The 3D model will be a bit of a challenge for me and will have to be printed in 4 or 5 pieces. Maybe with a space for the Extron amps.
I had some time to build up the preliminary model:
I am not sure if this is worth building. As shown, the horizontal angle (single flare) is ca 53 degrees, the primary vertical 45 degrees and secondary ca 53 degrees. The intention was to use these in a small workshop (all three dimensions just around 200 - 230 cm) placed on their side in two opposing corners - for background listening while working. I might actually get better off with just two full range drivers in triangular boxes aimed so that their axes cross in the middle of the room.
I am not sure if this is worth building. As shown, the horizontal angle (single flare) is ca 53 degrees, the primary vertical 45 degrees and secondary ca 53 degrees. The intention was to use these in a small workshop (all three dimensions just around 200 - 230 cm) placed on their side in two opposing corners - for background listening while working. I might actually get better off with just two full range drivers in triangular boxes aimed so that their axes cross in the middle of the room.