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In Reply to: RE: I Need Help Achieving 100Hz & Below Correctly posted by Paul Joppa on August 15, 2014 at 11:39:07
Paul,I believe the room is pretty much a non-issue for me because the "sub" will see a room that's roughly 40'W x 12.5'D ---{and then some}--- with a ceiling that slopes from 8' to 10' in height. The reason for this is I have a very open layout with only a small 1/2 wall separating my audio room from my kitchen and my kitchen from my dining room. So bass should be a bit easier to attain than in many other rooms.
As for trying inexpensive but adequate "starter" subs I have a 120W NHT SA-2 dedicated sub-amp as well as the accompanying SW2 sub and/or a pair of dipole 15" "Augie" subs I could use with the SA-2 amp. So I have a couple of "starter" subs to play with. I was looking for suggestions as to what I should use after my experimenting is done. But I appreciate your input all the same!
I'm listening to:
Thetubeguy1954 (Tom Scata)
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Edits: 08/15/14Follow Ups:
My remarks are based on experiences that include larger, better-proportioned rooms than yours. I stand by them.
Paul is right that room modes can cause havoc with bass. One idea to remove room modes from concern is a bass strategy which places bass woofers (i.e, 4 or 6) on the front wall and a similar number of bass woofers wired out of phase on the back wall. This prevents room modes from occuring. People who have tried it rave about it.
You may be a purist by running your mains wide open, but believe me, the bass is muddying up the midrange of your wide band drivers. Your best bet is to cut out the bass no lower than 100 hz, and rely on your woofers to provide all the bass.
Retsel
Hi Retsel!
I would agree your statement; "... believe me, the bass is muddying up the midrange of your wide band drivers. Your best bet is to cut out the bass no lower than 100 Hz, and rely on your woofers to provide all the bass " is probably true 99% of the time. However due to the application of the Rispoli, 7-step, proprietary, cone-treatment to my drivers. If you heard the level of clarity & transparency in the midrange of my PS220-8 wide band drivers. Upon hearing them you'd probably agree with my assessment that adding crossover components to the PS220-8 driver would probably cause more sonic damage to the purity of the sound, than removing music below 100Hz would clean!
I'm listening to Night On Bald Mountain by Fireballet
Thetubeguy1954 (Tom Scata)
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Saturntube is right. Cutting the bass below 100 hz to your amps not only avoids a speaker-level crossover, but it reduces the load on the amps as well. This will dramatically reduce the distortion of the amps and the speaker.
Regardless of how good the speakers are, it is physics (doppler distortion) which is the cause for the distortion in the midrange when the midrange driver is trying to reproduce bass.
Retsel
Of course xovering at 100 hz could be done at line level, and not at speaker level. Anyway I would not touch what you like and add a subwoofer. IME Sub amps are the culprit and should be avoided at all costs. Even a Beringher DCX would be better, get nice SS amp with a damping factor of around 4000. Hook any sub to that and then evaluate.
If room modes are your concern, some filtering would still be possible with the DCX or other more profesional Digital XOver solutions.
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