OOps! Sorry. From the info on the home page I assumed you did. Thanks for the reply and I will probably find my way with the stuff I already have. Just have to take the time to learn the dials and do-dads. No need for B&W level research here.😀
I use the Smith&Larson Woofer Tester Pro. I just acquired a USB mic, so I be testing a few of the free programs. Of course, I can't use any of them for my commercial work, but they will be good for quick and dirty in-room measurements.
Bob
Bob
Just took a quick look at the site. That's an impressive system. "An Exceptional Value at $999.95" 😀😀😀
I will read the docs there and hopefully learn some things. Let us know the results of the free software experiments when you get a chance. Thanks for the reply.
I will read the docs there and hopefully learn some things. Let us know the results of the free software experiments when you get a chance. Thanks for the reply.
Bob,
I use Holmimpulse for measurements. It is free, works great and easy to use. It even has a wm61a calibration file to normalize the Panasonic mic. You can do search for "wm61a measurement" and they show how to connect the mic capsule to a 3.5 mm jack so you can plug into the sound card mic input of your PC.
I use Holmimpulse for measurements. It is free, works great and easy to use. It even has a wm61a calibration file to normalize the Panasonic mic. You can do search for "wm61a measurement" and they show how to connect the mic capsule to a 3.5 mm jack so you can plug into the sound card mic input of your PC.
X, I saw the diagrams last night. The Panasonics show a delivery date no later than June 6. Looking forward to using them. Will check out Holmimpulse by that time.
Ah, right!
I have a Dayton EMM-6. I downloaded REW and HolmImpulse. I spent all of 15min with them. REW ran out of the box. Holm didn't. I did not have the time to play with it. I may get back to it next week.
As I said, I cannot use either commercially. Just for my own amusement.
Bob
HolmImpluse and REW both up and running on Windows 7 64 Bit. It's off to study hall - looks like fun!!
One thing about some laptop built in sound cards: they only go to 10 khz which is fine for cabinet bass work. You may need an external usb mic input to do 20 khz.
Another test done.🙂
The DNAs and the ACAs do indeed make a nice combination. I've been using the Honey Badger amps for all the auditions so far, but the Amp Camp modules hold their own for a low cost easily built complete system. There is a little less body again at the low end but all the notes are there. Just for a simple approximate comparison - I have a $125 Sony Boom Box (W/Turbo Bass Boost 😉), and this combo sounds better. That's great for a $30 pair of amps and as X says - a $16 speaker that does 30 Hz. Of course the BB doesn't get anywhere close to the width of stage and voice/instruments placement produced by the DNA pair. A direct feed from the Walkman sounds great, but the DNAs can make good use of a lot more power than that.
The timbre of this combination is a bit lacking but that, IMO, can be tweaked in with some crossover work and/or a different tweeter. I think the bass response can get better once I move the Cornus and the Sunflowers out and get the DNAs closer to the corners of the room. I'ts pretty cluttered on that wall. I'll report back on that later. I believe the Cornus offer a little more flexibility of location, but that shouldn't stop one from building and trying a pair of these.
I'll add that the exceptional horn effect like the 30 Hz stuff reported earlier doesn't translate directly when the more complex wave forms in music are played. I think that is to be expected considering the small magnet/motor on these drivers. The Vifas most likely have a better grip on the cone movements.
Just happens I read a statement on the Bob Brines site today describing the listener's approach that fits well here..... paraphrasing: - excellent results can come from realistic and moderate expectations of the equipment being used.
From what I'm hearing, this combo matches that sentiment.
BTW: I'm familiar with the concept but not very knowledgeable in application - does anyone think there is merit to distance/offset calculations for tweeter placement for this build?
The DNAs and the ACAs do indeed make a nice combination. I've been using the Honey Badger amps for all the auditions so far, but the Amp Camp modules hold their own for a low cost easily built complete system. There is a little less body again at the low end but all the notes are there. Just for a simple approximate comparison - I have a $125 Sony Boom Box (W/Turbo Bass Boost 😉), and this combo sounds better. That's great for a $30 pair of amps and as X says - a $16 speaker that does 30 Hz. Of course the BB doesn't get anywhere close to the width of stage and voice/instruments placement produced by the DNA pair. A direct feed from the Walkman sounds great, but the DNAs can make good use of a lot more power than that.
The timbre of this combination is a bit lacking but that, IMO, can be tweaked in with some crossover work and/or a different tweeter. I think the bass response can get better once I move the Cornus and the Sunflowers out and get the DNAs closer to the corners of the room. I'ts pretty cluttered on that wall. I'll report back on that later. I believe the Cornus offer a little more flexibility of location, but that shouldn't stop one from building and trying a pair of these.
I'll add that the exceptional horn effect like the 30 Hz stuff reported earlier doesn't translate directly when the more complex wave forms in music are played. I think that is to be expected considering the small magnet/motor on these drivers. The Vifas most likely have a better grip on the cone movements.
Just happens I read a statement on the Bob Brines site today describing the listener's approach that fits well here..... paraphrasing: - excellent results can come from realistic and moderate expectations of the equipment being used.
From what I'm hearing, this combo matches that sentiment.
BTW: I'm familiar with the concept but not very knowledgeable in application - does anyone think there is merit to distance/offset calculations for tweeter placement for this build?
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Bob,
Thanks for the update with the ACA's. I can't wait to build those ACA's as soon as I find some time. I need a sensitive speaker though with only 5 watts max. Thinking of something like the FE126EN for high sensitivity in a BLH or the Betsy in a MLTL.
If you want, I can sim the tweeter placement for you in AkAbak - just need the T/S params and cross-over specifics and connections - AkAbak does it all - the electrical as well as the acoustic portions, in addition to placement and diffraction effects.
Thanks for the update with the ACA's. I can't wait to build those ACA's as soon as I find some time. I need a sensitive speaker though with only 5 watts max. Thinking of something like the FE126EN for high sensitivity in a BLH or the Betsy in a MLTL.
If you want, I can sim the tweeter placement for you in AkAbak - just need the T/S params and cross-over specifics and connections - AkAbak does it all - the electrical as well as the acoustic portions, in addition to placement and diffraction effects.
Thanks for the offer, I'll get the data together and send it to you. In the picture the JC-2 Pre is pushing the ACAs. It sounds good at rather high volume and using a pre may influence what you select as a driver. Just a thought.
Your setup is awesome! I really like how you built the amps to power the speaker too. I guess video is next???
Bob,
Do you have photos of your ACA build posted somewhere? Your heatsinks appear to be dc to dc converter half bricks which I considered using because they are inexpensive but folks on the ACA thread said they would get too hot. I think they should dissipate 10 watts ea no problem.
Do you have photos of your ACA build posted somewhere? Your heatsinks appear to be dc to dc converter half bricks which I considered using because they are inexpensive but folks on the ACA thread said they would get too hot. I think they should dissipate 10 watts ea no problem.
Bob,
I was thinking how you say this sounds pretty good for the price. It's rare to have a true HiFi setup with a Steve Deckert BLH speaker powered by a Nelson Pass single ended class A amp for under $100! I bet it sounds better than many $700 stereos out there. Nice job.
I was thinking how you say this sounds pretty good for the price. It's rare to have a true HiFi setup with a Steve Deckert BLH speaker powered by a Nelson Pass single ended class A amp for under $100! I bet it sounds better than many $700 stereos out there. Nice job.
I posted somewhere but don't have the link handy. I'll take the risk of hijacking the thread and repost till I find it. There was some text but here are the pics. Two xeon heatsinks per amp.
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Hijack away! Are those surplus pc cpu heatsinks? I like the angle bracket as main structure and heatsink base. I am thinking of using a Pentium 2.4 GHz cooler fin.
Thanks all for the complements. Yes, PC stuff - I got bunches of them while building a render farm with a some dual processor surplus motherboards.. They came from eBay about four years ago. There are still some good units there at a bargain.
I salvaged four 8' links of 3" X 3" X 1/4 structural aluminum from my former employer. I'm gonna be lost when I run out. !!!
I salvaged four 8' links of 3" X 3" X 1/4 structural aluminum from my former employer. I'm gonna be lost when I run out. !!!
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That's a nice score of aluminum angle stock. Metalsdepot.com sells 8 ft of 3x3x0.25 angles for $91 ea. Another option for amp structures with lots of surface area for heat transfer are Bosch rails.
Aluminum Structural Framing - Aluminum Structural Framing - aluminum, custom worktable, ergonomic workstation, extrusion, framing, framing components, industrial framing, lean manufacturing, modular construction, profiles, structural framing, t-slot
They build clean room workstations and Porsche assembly lines with this stuff.
They actually are not that expensive compared to plain channels and let you connect things with T-slots. They come in many profiles. http://www13.boschrexroth-us.com/catalogs/mge70/sections/section2.pdf
Maybe a 4 in long free eval-sample will be a great heat sink?
OK, we will get back to our regular programming now of the DNA horn. Actually the angles can make good out rigger legs... so it is related 🙂
Aluminum Structural Framing - Aluminum Structural Framing - aluminum, custom worktable, ergonomic workstation, extrusion, framing, framing components, industrial framing, lean manufacturing, modular construction, profiles, structural framing, t-slot
They build clean room workstations and Porsche assembly lines with this stuff.
They actually are not that expensive compared to plain channels and let you connect things with T-slots. They come in many profiles. http://www13.boschrexroth-us.com/catalogs/mge70/sections/section2.pdf
Maybe a 4 in long free eval-sample will be a great heat sink?
OK, we will get back to our regular programming now of the DNA horn. Actually the angles can make good out rigger legs... so it is related 🙂
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How would the FE167e fit into the DNA horn? Horn length seems to be about right and also the coupling chamber / bass reflex chamber (it is a hybrid after all) is right for the FE167e . It certainly is more reasonably sized than the Replikon (narrow the FP163 from 30 to 20 cm and you are almost spot on) and I do like the rear horn opening.
Thanks.
Thanks.
