SUBWOOFER SETUP
Matt
PLX 1602, and 2 Carvin 4ohm 800w subs. If I bridge the amp (mono), it
will generate 1600w at 4ohms. If the speakers are hooked up in series,
does this setup mean I am getting 800w at each speaker? What if I do not
bridge the amp? The spec sheet calls stereo out at 500w per channel.
Off to flip through the Yamaha Guide to Live Sound. THANX!
matt
John Halliburton
"Matt" <ndtn...@comcast.net> wrote in message
news:3FC4B4C5...@comcast.net...
> Was wondering what is the best setup for my amp/subwoofer. I have QSC
> PLX 1602, and 2 Carvin 4ohm 800w subs. If I bridge the amp (mono), it
> will generate 1600w at 4ohms.
If the speakers are hooked up in series, does this setup mean I am getting
800w at each speaker?
No, ohm's law is working here. Two 4ohm cabinets hooked up in series will
yield a total load of 8ohms.
The PLX1602 will develop roughly half of the 1600watts with this hookup, or
800 watts total, which will split between the two cabinets, and yield
400watts into each box.
What if I do not bridge the amp? The spec sheet calls stereo out at 500w
per channel.
Without changing amps, I'd say the best set up is using the amp in stereo,
and run one subwoofer off of each channel. Either situation is
underpowered, but the amp should be more stable in stereo mode at four ohms
each side. It would be wise to provide extra fan cooling in the rack with
the amp, as it will heat up. You really should have clean headroom in
sizing an amp to the power spec of the subs, I'd look into something in the
1000-1200 watts per channel range for your subs. A used Crown MA2400 would
be a nice start-well proven to be a good line of subwoofer amps-and not bad
on the rest of the frequency range too.
Best regards,
John Halliburton
Servodrive/Sound Physics Labs, Inc.
www.servodrive.com
Matt
out bridges mono 8ohm is 1100w; so each cabinet will get 550w??
If I hook this up in stereo, the amp will produce 500w at 4ohms. The
stereo setting will be easier on the amp than bridging?
Matt (really confused now).
liquidator
> So if I hook the amps up in series, its 8ohm total. The spec sheet calls
> out bridges mono 8ohm is 1100w; so each cabinet will get 550w??
>
A serious word of caution-what are you calling series? Chaining from one cab
to another is PARALLEL unless you do some special wiring. 2 (4 ohm) load in
parallel is 2 ohms- which just might cook that amp in bridged mode.
I would recommend running the amp at 4 ohms/channel an daisy chain the
inputs.
> If I hook this up in stereo, the amp will produce 500w at 4ohms. The
> stereo setting will be easier on the amp than bridging?
>
> Matt (really confused now).
>
You probably will damage the amp if you run it bridged. Run it normal but
chain the inputs (parallel mono)
Matt
from channel 1 to sub on stage left, another cable from channel 2 to sub
on stage right. I understand that the parallel setting on the amp will
split a single (mono) input between the two channels. My question now is
what will the load be with this set up (no bridging, normal set up)?? I
thought the ohms would be the sum of both speakers (but, i think that is
for bridging???)??
If I run the amp in parallel, and I have two 4ohm 800w subs (which will
be 2ohms in the above setup?), will I be OK with the amp I am using (QSC
PLX1602)?? It says power at 2ohms per channel is 800w? This is where I
am confused.
Thanks for the help!!!
Pete Kerezman
>If I run the amp in parallel, and I have two 4ohm 800w subs (which will
>be 2ohms in the above setup?)
It will NOT be 2ohms! It will be 4ohms *per channel*. If you have
your amp manual, read it! If you don't, it's at:
http://www.qscaudio.com/products/amps/plx/plx.htm
Texas Pete
liquidator
"Pete Kerezman" <pete...@aol.com> wrote in message
news:e3m9svguf82f10ev5...@4ax.com...
> On Wed, 26 Nov 2003 11:25:42 -0500, Matt <ndtn...@comcast.net> wrote:
>
> >If I run the amp in parallel, and I have two 4ohm 800w subs (which will
> >be 2ohms in the above setup?)
>
> It will NOT be 2ohms! It will be 4ohms *per channel*.
Pete is correct if you run the amp's inputs in parallel. This is what I
recommend.
If you run the speakers in Parallel and bridge the amp it will be a 2 ohm
load on an amp rated for only 4. I do NOT recommend this.
The difference is running the amp channels in parallel vs running the
speakers in parallel. This is 2 entirely different settings.
Matt
Reinforcement book. It says to calculate net impedance when speakers are
in parallel with my set up (2 4ohm subs), the net impedance is half the
impedance of either speaker, in my case 2 ohms. That lead me to my power
amp book, which is confusing (me).
matt
Matt
matt
Charlie Escher wrote:
> In article <3FC4FD44...@comcast.net>, ndtn...@comcast.net says...
>
>>Maybe I am interpreting this incorrectly.
>
>
> Yes, you are.
>
>
>>I am reading the Yamaha Sound
>>Reinforcement book. It says to calculate net impedance when speakers are
>>in parallel with my set up (2 4ohm subs), the net impedance is half the
>>impedance of either speaker, in my case 2 ohms. That lead me to my power
>>amp book, which is confusing (me).
>
>
> Each amp channel drives one speaker, so each channel sees a 4 ohm load.
> The amp channels are paralleled, not the speakers.
Pooh Bear
> Maybe I am interpreting this incorrectly. I am reading the Yamaha Sound
> Reinforcement book. It says to calculate net impedance when speakers are
> in parallel with my set up (2 4ohm subs), the net impedance is half the
> impedance of either speaker, in my case 2 ohms. That lead me to my power
> amp book, which is confusing (me).
What do you do for a living btw Matt ?
Graham
Adair Winter
and 2 or A and B) plug in the output from your crossover to Input A on the
amp. now you'll have seperate control over each sub channel on the amp and
each cab will see 500watts.
or, set the amp in stereo and do the same as above, except you will have to
parellel the inputs on the amp with seperate cables. say, output from
crossover to amp channel 1 then take another cable and plug it into amp
channel 1 and also connect it to amp channel 2..
Adair