What would the major differences be between running two 250W rms 12" subs vs
one 400W rms 12" sub. I am talking about powering it with 300W rms. Which
one would give better SQ?

Also I suppose the 300W amp will drive one sub better that two, is this
true?

I listen to rock music mostly and I need some high quality bass not that
cheap high SPL ****

Assuming you built the boxes correctly and youuse the same type of box for
both setups, the dual 12 box will walk all over the single 12 box. The
single 12 would have to have immense Xmax to make up for the extra surface
area of the dual 12s and it usually can't be done.


Paul Vina



"Johan Wagener" wrote in message
...
What would the major differences be between running two 250W rms 12" subs
vs
one 400W rms 12" sub. I am talking about powering it with 300W rms. Which
one would give better SQ?

Also I suppose the 300W amp will drive one sub better that two, is this
true?

I listen to rock music mostly and I need some high quality bass not that
cheap high SPL ****

OK, so how about the power. is 300W enough to drive two 250W subs? Or at
least for the time being. I just don't want the subs to distort because of
too little power.



"Paul Vina" wrote in message
news:KJlFb.11819$VB2.20860@attbi_s51...
Assuming you built the boxes correctly and youuse the same type of box for
both setups, the dual 12 box will walk all over the single 12 box. The
single 12 would have to have immense Xmax to make up for the extra surface
area of the dual 12s and it usually can't be done.


Paul Vina



"Johan Wagener" wrote in message
...
What would the major differences be between running two 250W rms 12"
subs
vs
one 400W rms 12" sub. I am talking about powering it with 300W rms.
Which
one would give better SQ?

Also I suppose the 300W amp will drive one sub better that two, is this
true?

I listen to rock music mostly and I need some high quality bass not that
cheap high SPL ****

OK, so how about the power. is 300W enough to drive two 250W subs? Or at
least for the time being. I just don't want the subs to distort because of
too little power.

Speakers can't distort from too little power. The only way you can cause
distortion from too little power is if you drive the amp into clipping in
order to get it louder than it can cleanly play. Having two subs instead of
one will help prevent that as the total sensitivity of the system is
increased due to increased cone area.

All else being equal of course.

Thanks Mark, so it would be best to go for the two sub setup

"Mark Zarella" wrote in message
...
OK, so how about the power. is 300W enough to drive two 250W subs? Or at
least for the time being. I just don't want the subs to distort because
of
too little power.

Speakers can't distort from too little power. The only way you can cause
distortion from too little power is if you drive the amp into clipping in
order to get it louder than it can cleanly play. Having two subs instead
of
one will help prevent that as the total sensitivity of the system is
increased due to increased cone area.

All else being equal of course.

What would the major differences be between running two 250W rms 12" subs vs
one 400W rms 12" sub. I am talking about powering it with 300W rms. Which
one would give better SQ?

Also I suppose the 300W amp will drive one sub better that two, is this
true?

I listen to rock music mostly and I need some high quality bass not that
cheap high SPL ****

I listen to rock mostly as well, and have tried various setups without
changing boxes or amps, so I can give my unbiased thoughts on this.

My subs tend to like power (350W RMS for my old 10's, my new 12's are
rated for 400w RMS). With my old setup, I had one amp driving both 10's
and it sounded good, but when I switched to one amp for each sub, it
really woke things up.

When I built the box for my 10's I bench tested it in my house, with my
Kenwood KAC-7201 amp. I tried three different configurations and I'll
report my findings.

1) L channel to L sub, R channel to right sub. Amp threw 150W RMS into
each sub and saw a load of 4 ohms on each side. I'm not going to say
whether this sounded good or bad, I'm going to use this one as a benchmark.

2) Bridged the amp, wired the subs in parallel. Amp is rated for 460W
RMS into 4 ohms and it was seeing 2 ohms, so probably somewhere over 500
W going into the pair of subs though I have no way of knowing. This
setup was noticably louder than config 1, with no drop in punch or
percieved SQ.

3) Took one sub out of config 2, so the amp was still bridged, but it
was only running into 1 sub, and it saw a 4 ohm load. This setup was
equally as loud as config 1, though not as loud as config 2. But the amp
obviously ran a lot cooler than config 2 and I imagine the amp would
last longer.

I would suggest running 1 sub closer to it's RMS limit (300 into a 400W
sub is perfect) rather than slightly underdriving 2 subs. As soon as I
get the cash I'm going to buy a second amp so I can run 460w into each
sub. Technically it may not be any louder than my current setup, but I'd
rather know that the amps weren't having to work as hard, and I believe
that with two sets of power supplies, caps, and all the other fun stuff
in an amp, it's better to have two amps running comfortably, than one
amp going crazy. Better for SQ that is...

Hope this helps,

Aaron

3) Took one sub out of config 2, so the amp was still bridged, but it
was only running into 1 sub, and it saw a 4 ohm load. This setup was
equally as loud as config 1, though not as loud as config 2. But the amp
obviously ran a lot cooler than config 2 and I imagine the amp would
last longer.


You ran one sub in a box twice as large as it should have been? That's not
a fair comparison.

You ran one sub in a box twice as large as it should have been?
That's not
a fair comparison.


No no, my sub box has a devider. I will never run two subs in the same
chamber. Blew a sub once like this...

No no, my sub box has a devider. I will never run two subs in the same
chamber. Blew a sub once like this...

Ah, I see. Then it's a fair comparison. Never mind me.

Not sure how one can blow a sub without using a divider though. But that's
another issue.

Ah, I see. Then it's a fair comparison. Never mind me.

Not sure how one can blow a sub without using a divider though. But that's
another issue.

Two subs, two seperate amps, one running the left channel, other running
the right. A song came on with stereo bass and one speaker overpowered
the other, burned the voice coil up and made the leads un solder
themselves from the cone. =) LOL

That was the last time I ever bought a pre fabbed box.

An unseperated box would work fine if the subs were connected to one
channel, or you were running an amp in mono. I was asking for it running
two seperate amps with seperate signals.

Cheers,

Aaron