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In Reply to: RE: Help Needed Selecting The Right Hi-Efficiency Subwoofer posted by thetubeguy1954 on May 02, 2017 at 12:34:42
What drivers are you using?
I never understood something about the Beauhorns. To get much sound reinforcement at lower frequencies (150 to 500 hz) to bring up the efficiency of something like a Lowther, the front horn would have to be much larger than that of the Beauhorns. If that is the case, then how do the Beauhorns achieve that level of efficiency? Is the front horn just for show? Maybe the Beauhorns utilize a very small compression chamber to balance out the frequency response?
One thing I found with my Hedlund Horns is that the back horn has to be very well braced to get great quality midbass from them. You can ask what Paul Butterfield about that because he did the same thing to his Hedlund Horns.
The subwoofer you use depends on what you want to use the system for. If you only need response down to 30 hz for audio, then a small boxed subwoofer, such as a Rythmic would be fine. If you want to go lower for home theater type stuff, then you will need something with more oomph. Another idea is to check out the push-pull slot loaded type subs (push-pull sealed box, vented box, open baffle...).
I had a Genesis servo sub (a single 15 inch driver) with my Hedlund horns, and it worked out very nice for audio.
I'm using Lowther DX4 drivers in my Beauhorn Virtuoso cabinets. I may be mistaken but I read somewhere that the front horn of the Virtuoso covers frequencies from 300 Hz and above. I feel the back horn covers sufficiently down to at least 50 Hz at all times and sometimes it seems lower. I used to use Sachiko back loaded horns and having heard Paul's Hedlund horns many times at his home, I know:
1) The Sachikos were the better sounding of the two designs.
2) I prefer the Beauhorn over the Sachikos.
As far as the horns I'll use as subs, obviously the lower the better, but that being said, 30 Hz to 90 Hz would probably be sufficient for my needs 95% of the time. I want to get these subs right the very first time, so I'm NOT rushing into anything. So far I 'm leaning towards using a pair of tapped horns, with a couple of great plate amps...
I'm listening to: Make Someone Happy by Sophie Milman
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
I think the DX4 drivers are very nice. Most people say they prefer the "A" series of Lowther drivers to the DX series, but a few prefer the DX series over the "A" series.
As far as what frequency response that the Beauhorn front horn accentuates, I recently did a literature search on this forum, and ran across a post by Thorsten Loesche who stated that the front horn of the Beauhorn boosts frequencies down to 300 hz. That may be what you are referring to. I still don't understand this statement giving the size of the front horn mouth, though.
I suggest that you high pass the DX4s at whatever frequency that makes sense to preserve the midrange. If the Lowther DX4s try to reproduce lower frequencies, the midrange will distort. I have 15 ohm DX4s and the x-max is 3 mm. The 8 ohm variety of the Lowther DX4s has only 1 mm of x-max. Also the 15 ohm Lowther DX4s don't have the 2khz frequency bump like the 8 ohm variety does.
My Lowther DX4s are on open baffle and I high pass (1st order) the DX4s at 100 hz, maybe a little higher. Even at that fairly high frequency, some significant bass rich music can still cause issues even with the high pass. I figured out that I likely need to add a second order to the high pass crossover. You are likely in a better place than me because the backhorn will provide some loading to the driver at lower frequencies to dampen the cone movement.
Have you compared the doorknob diffusers to the holey doorknob diffusers that Lowther sells? I saw that Dave Slagle still uses the bullet style of diffuser with his Azura horns. That maybe because the Azura horns have a faster expansion compared to most horns. He, of course is using his field coil Lowhters, and maybe that makes a difference.
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