REL Quake or ACI Force for semi small room

Dear Matthew and friends: My advise is that you need two subs in your, btw in any audio system.

Please take a look: http://forum.audiogon.com/cgi-bin/fr.pl?eanlg&1117893153&openflup&27&4#27

The crossover point is extremely critical and my experience always told me that it has to be at around: 80Hz.

Regards and enjoy the music.

Raul.

"That said when setting the sub up you would need to set the crossover slightly higher than the lower notes on the main speakers"

That has not been my experience at all. I have always had to set about 5 Hz lower than the stated -3dB point of my speakers.

Raul ... 2 subs MAY load a room better than one, but they also cost twice as much. Given a budget of $1000 I'd rather pick one $1000 sub than two $500 subs.

As for crossover ALWAYS being at 80Hz that would only apply if you are filtering the signal to the main speakers. If you are running the main speakers full range then the sub crossover frequency will depend on the specification of the main speaker. No one frequency will work.

yes, the guys at ACI recommend using a 60 or 80hz passive high pass filter on the mains. this just plugs inline to the interconnects b/t the pre-amp and amp.

i am curious if anyone has done this?

it certainly makes sense to not drive the speakers as hard in the lower realms.

at the same time, the thought of putting a cheap capacitor into my system seems like an added complication. because i have an intergrated, i'd have an interconnect leaving the pre-amp outputs, looping out, through the crossover, and right back into the amp input = weird.

my local dealer says that the high pass addition is silly, that the speakers roll off naturally where they should. the sub should just augment this natural roll off.

hum?

Dear Sean: It is not only that two subs may load a room better than one, it is that two are necesary for the stereo effect remember that the music is not only " fundamental frecuencies " but harmonics too.

Btw, I'm not saying that the crossover be ALWAYS at 80Hz but this is a good point to start when you are filtering the signal to the main speakers. I agree with you that no one frecuency will work.

+++++ " That has not been my experience at all. I have always had to set about 5 Hz lower than the stated -3dB point of my speakers. " +++++

I respect your point of view but I'm not agree with it on this regards: we have to remember that we use subwoofers not only for a better quality/quantity low bass but for a better mid bass/mid range performance.

Regards and enjoy the music.
Raul.

Dear Mattehw: With all respect your dealer dos not know nothing about, sorry.

+++++ " it certainly makes sense to not drive the speakers as hard in the lower realms..." +++++

Certainly is. Please read carefully the link that I already give you ( the one that I post in this thread ). Read from SUDDENLY and below. It will be interesting for you.

Regards and enjoy the music.
Raul.