QSC USA 1300 How do I Bridge?
Mark Scotford
power my new pair of EV SB181 Subs. I do not have a manual for this
amp (I got it secondhand) and the QSC site only has a very basic
operators manual which does not tell U how to run this amp in bridge
mode. Are there any kind souls out there who have first hand
experience of this (old) amp, and can tell me how to do it. Plus any
other (helpful) tips on this configuration. The whole set up consists
of an EV P1250 amp powering my EV SX300's (Mid-Top) with a DBX 223
electronic crossover (with an infinatly variable crossover point).
Another thing I want to just double check with you guys is that, will
I get more perceived output from my subs, running them in bridged mono
rather than running them in stereo? if so how much (is it double)?
TIA, Mark Scotford (UK)
kapteeni kosminen
we have one in our rehearsal place. so this might not go right, but i
think there's just a switch on the back of it. hope i got it right.
this was professional :)
--
anssi
Tom Hole
Mark,
I could not find any specs on the 1300, but it looks like it is a 1310
with an old name. According to QSC's spec sheet, you cannot run a USA
series amp into 4 ohms bridged. It will only do 8 ohms bridged. You
may want to email QSC and see if they recommend bridged into 4 ohms.
It'll do a 2 ohm load stereo, so maybe it can handle a 4 ohm bridged
load.
Are the dip switches on the back of the 1300 the same as the 1310? If
so, set them up like this:
1 2 on (up)
3 4 5 off (down)
6 7 8 on (up)
If not, set the inputs to parrallel, all CH2 dip switches off, and the
limiter on, low pass on, lowpass to 30 hz.
The important thing on the QSC dip switchs is to set all of the CH2
specific dip switches to off. I set up my RMX 2450 bridged with the
CH 1 & 2 limiter on, and the amp clipped at about 15 watts. I then
set it up like the picture on the back of the amp said and it worked
fine.
As far as power goes, unless the 1300 will go to 4 ohms bridged, you
will be underpowered if you use it on the subs. EV has proprietary
power ratings (they are trying to fool people to think they are more
powerful than other manufacturers who list RMS, program and peak power
ratings), but it looks like each sub should be getting 600 watts. Each
300 should be getting 300 watts.
Here's how I would set it up:
EV1250 bridge mono - EV181s parrallel (each sub gets 650 watts)
USA 1300 2 channels, each into 8 ohms - 1 EV300 per channel (each
speaker gets 375 watts)
This should power the speakers properly.
Don't get confused between stereo and 2 channel operation. You never
need a stereo signal to the subs.
Tom
Mark Scotford
>Mark Scotford <ma...@markXscotford.com> wrote in message news:<er340u0vgbbk6jc7g...@4ax.com>...
>> I have a QSC USA 1300 (Not1310) and I want to run it in bridge mode to
>> power my new pair of EV SB181 Subs. I do not have a manual for this
>> amp (I got it secondhand) and the QSC site only has a very basic
>> operators manual which does not tell U how to run this amp in bridge
>> mode. Are there any kind souls out there who have first hand
>> experience of this (old) amp, and can tell me how to do it. Plus any
>> other (helpful) tips on this configuration. The whole set up consists
>> of an EV P1250 amp powering my EV SX300's (Mid-Top) with a DBX 223
>> electronic crossover (with an infinatly variable crossover point).
>> Another thing I want to just double check with you guys is that, will
>> I get more perceived output from my subs, running them in bridged mono
>> rather than running them in stereo? if so how much (is it double)?
>> TIA, Mark Scotford (UK)
>
>Mark,
>
>I could not find any specs on the 1300, but it looks like it is a 1310
>with an old name. According to QSC's spec sheet, you cannot run a USA
>series amp into 4 ohms bridged. It will only do 8 ohms bridged. You
>may want to email QSC and see if they recommend bridged into 4 ohms.
>It'll do a 2 ohm load stereo, so maybe it can handle a 4 ohm bridged
>load.
>
>Are the dip switches on the back of the 1300 the same as the 1310? If
>so, set them up like this:
A: Mine does not have DIP switches, rather 16W DIL solder pads like a
8W DIP but uses wire links instead.
>
>1 2 on (up)
>3 4 5 off (down)
>6 7 8 on (up)
>
>If not, set the inputs to parrallel, all CH2 dip switches off, and the
>limiter on, low pass on, lowpass to 30 hz.
>
>The important thing on the QSC dip switchs is to set all of the CH2
>specific dip switches to off. I set up my RMX 2450 bridged with the
>CH 1 & 2 limiter on, and the amp clipped at about 15 watts. I then
>set it up like the picture on the back of the amp said and it worked
>fine.
>
>As far as power goes, unless the 1300 will go to 4 ohms bridged, you
>will be underpowered if you use it on the subs. EV has proprietary
>power ratings (they are trying to fool people to think they are more
>powerful than other manufacturers who list RMS, program and peak power
>ratings), but it looks like each sub should be getting 600 watts. Each
>300 should be getting 300 watts.
>
>Here's how I would set it up:
>
>EV1250 bridge mono - EV181s parrallel (each sub gets 650 watts)
>USA 1300 2 channels, each into 8 ohms - 1 EV300 per channel (each
>speaker gets 375 watts)
A: Had tried to avoid using the QSC for my Mid/Tops for no other
reason than that, one of the reasons I bought the EV P1250 over the
P1200 was to use the filters/enhancers of the P1250, to get the best
sound out of my SX300's, I was happy to have a slightly reduced Bass
response in favour of more clarity in my mid/top end, or am I just
being a wally?
>
>This should power the speakers properly.
>
>Don't get confused between stereo and 2 channel operation. You never
>need a stereo signal to the subs.
A: Agreed but until I know how to run my QSC (if thats what I end up
doing) in bridge mode, this was the default way of running them.
>
>Tom
A: Tom thanks for taking the time to reply, you have got me thinking
about which Amp I should drive what now. I will be getting a new amp
for my subs when I can afford it, something with a bit more poke, just
in the meantime trying to get the best out of my kit, thanks.
Regards, Mark Scotford (UK)
Scott Koons
Mark Scotford <ma...@markXscotford.com> wrote in article
<er340u0vgbbk6jc7g...@4ax.com>...
One very important item to remember about that amplifier is the input is
RTS [tip -]. you may have your polarity reversed between subs and tops if
this isn't taken into consideration. As for bridged mode, there should be a
switch at the bottom of the amp that switches the amp to bridged mode. The
amp will support a 4 ohm bridged load.
--
Scott Koons
SDK Electronics
http://www.sdkelectronics.com
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Tom Hole
"Mark Scotford" <ma...@markXscotford.com> wrote in message
> On 26 Nov 2001 11:24:12 -0800, tom...@hsanet.net (Tom Hole) wrote:
>
> >Mark Scotford <ma...@markXscotford.com> wrote in message
news:<er340u0vgbbk6jc7g...@4ax.com>...
> >> I have a QSC USA 1300 (Not1310) and I want to run it in bridge mode to
> >> power my new pair of EV SB181 Subs. I do not have a manual for this
> >> amp (I got it secondhand) and the QSC site only has a very basic
> >> operators manual which does not tell U how to run this amp in bridge
> >> mode. Are there any kind souls out there who have first hand
> >> experience of this (old) amp, and can tell me how to do it. Plus any
> >> other (helpful) tips on this configuration. The whole set up consists
> >> of an EV P1250 amp powering my EV SX300's (Mid-Top) with a DBX 223
> >> electronic crossover (with an infinatly variable crossover point).
snip
> A: Tom thanks for taking the time to reply, you have got me thinking
> about which Amp I should drive what now. I will be getting a new amp
> for my subs when I can afford it, something with a bit more poke, just
> in the meantime trying to get the best out of my kit, thanks.
> Regards, Mark Scotford (UK)
That all makes sense. Scott posted a reply on how to get it to go bridged
mono. Run the QSC on the subs and see what happens. If it blows up, you
can get a new QSC RMX 1450 that will power the subs nicely for $300 US.
Let us know how it works out.
One of the bands I am doing sound for has this same setup. I run a QSC RMX
2450 on the subs and an RMX 1450 on the tops (lots of headroom). The 300s
are a bit harsh and take a bit of work on the EQ, but the combo sounds good
with those amps. I set the xover at 175Hz.
Tom
RAWDAWGS
and they said as long as you dont have the clip light on steadily the amp will
bridge at 4 ohms The amps are designed to compete with the Crown Microtech
series 600 and 1200 and they were felt the amp should have been spec'd
accordingly.SM.
Jim Morgan
>We use a QSC 1300 and 1700 and they are great. I talked to the tech guys at QSC
>and they said as long as you dont have the clip light on steadily the amp will
I'm pretty sure you're thinking of the Series 1.
IIRC, there was a 1400 and a 1700. Both solid amps.
The USA series the USA 1300 which later became the USA 1310.
Remove NOSPAM to reply
Spammers and flamers and trolls, Oh My!
Mark Scotford
Thanks for taking the time to reply, in my original post I was asking
the question how do I put the QSC USA1300 into bridge mode, as I do
not have a manual for mine and the QSC web site does not have a manual
telling me how to do it. It has manuals for the 1310 and a couple of
people have given me their best guess at how to do it. I need somebody
who has done it, to give me the definative answer, can you help?
Thanking you in anticipation.
Mark Scotford (In the UK)
PS If anybody has the user manual in electronic form, please could you
email it to me at ma...@markXscotford.com (remove the X to reply).
Mark Scotford
everythings hunky dorey, thanks.
Mark Scotford