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In Reply to: RE: Dipole Subwoofers posted by stryke23x on July 11, 2016 at 00:12:57
Hi Stryke!
It might come as a surprise to you to discover I actually know Nick McKinney! I meet Nick around 2001 through Paul Butterfield and Mike Rispoli at a Central Florida Audio Society meeting at WMFE. I've also been recently been talking with Clayton Shaw about my using a pair of your A.E. Dipole 18s mounted on a baffle, one next to each of the Spatial Audio M3 speakers as subwoofers! I'd like them to cover from 100Hz and below and look quite similar to Clayton's M3 speakers. That would be the bomb! Providing one heck of a impact below 100Hz, no?
I'm Listening to: Across The Rubicon by Silhouette
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
Follow Ups:
Hi Tom, I definitely remember you from in the past. Were you on the basslist back in the day? I met Nick at the get together at Tom Danley's back in 1998 or 1999 I believe. Sadly Nick passed away this past year. I had taken over things for Nick after he went out of business in 2005. Would never be here doing this if I hadn't met him back then. Added a few things since that time. I think the Dipole18 with the M3 could be very cool. Clayton and I have discussed OB subwoofers as well.
Tomorrow I will be constructing a very simple H baffle and U baffle to take some measurements of. It looks like a single coil and resistor can be used to get quite flat response from below 30hz on up to 400hz or so. I will have results soon.
"Tomorrow I will be constructing a very simple H baffle and U baffle to take some measurements of. It looks like a single coil and resistor can be used to get quite flat response from below 30hz on up to 400hz or so. I will have results soon."
What kind of efficiency do expect to get with that configuration?
Dave
Hi Dave,
Open baffles in general are very inefficient due to the significant rolloff caused by the baffle. Adding the H frame or U frame does help increase the low end efficiency but can only do so much.
A single Dipole18 is about 93dB 1W. With the dual 8ohm coils in parallel for 4ohm, 2.83V input gives a max efficiency of about 96.5dB way up at 400hz. Modelling a 24" x 24" flat baffle shows a drop of of about 16dB from there to 30hz giving 80.5dB 2.83V at that point. The U baffle or H frame should get back somewhere between 6-10dB efficiency at 30hz which is quite good. It also increases the max output by the same amount. The OB is capable of about 98dB at 30hz, again with the U or H frame giving 6-10dB more maximum output. This requires only 20V input to do so, about 100W. Proper placement in the room will get back several dB more output. The plan is to measure the OB, U, and H all outside. Then bring into our well treated 13' x 21' room with 9ft ceilings and get some measurements at the listening position as well.
That is a lot better than I thought it would be. Will you be posting your results?
Dave
Hello again!
I would be very interested in your results of the H baffle and U baffle baffles. If you can get baffles like that to obtain flat response from below 30hz on up using just a single coil and resistor I'd be very, very interested in knowing more. If you wouldn't mind would you email me the results at: thetubeguy1954@yahoo.com I'd really appreciate it!
I'm Listening to: Across The Rubicon by Silhouette
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
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