QSC GX5 output voltage
QSC GX5 output voltage
Anyone know what the output voltage is on the GX5?
Re: QSC GX5 output voltage
Voltage squared divided by impedance.
T39 24" 3012lf (1 built 1 in progress)
SLA Pro x 2
Yamaha S112V x 1
QSC RMX 2450
dbx Driverack PA
SLA Pro x 2
Yamaha S112V x 1
QSC RMX 2450
dbx Driverack PA
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Re: QSC GX5 output voltage
=wattsDan30 wrote:Voltage squared divided by impedance.
Solve for voltage.
BAT10, Bad Auto Tuba. Reverse folded TAT to fit JBL 1014D, 350W driver, voltage limit unknown.
Re: QSC GX5 output voltage
63 volts
I first looked up the specs on QSC site, then went and used the calculator to find the answer on this link....
http://www.the12volt.com/ohm/ohmslawcalculators.asp#15
I first looked up the specs on QSC site, then went and used the calculator to find the answer on this link....
http://www.the12volt.com/ohm/ohmslawcalculators.asp#15
TomS
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Re: QSC GX5 output voltage
UM.
what about hooking up a multimeter and measuring a sine wave at 50hz or 1khz?
wouldn't that give you something closer to real world measurement?
I think thats what he's asking.
what about hooking up a multimeter and measuring a sine wave at 50hz or 1khz?
wouldn't that give you something closer to real world measurement?
I think thats what he's asking.
8 tuba 30 24" 3012lf
4 otop 12 kappa pro 12a
4 QSC PL 236
2 QSC PL 2.4
2 DBX DR 260
2 DBX DR PA
(Need more Otops. Bwahaha!)
4 otop 12 kappa pro 12a
4 QSC PL 236
2 QSC PL 2.4
2 DBX DR 260
2 DBX DR PA
(Need more Otops. Bwahaha!)
Re: QSC GX5 output voltage
Yes real world thanks
- Jon Barnhardt
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Re: QSC GX5 output voltage
I've never pushed mine more than about 40-50 volts.
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Re: QSC GX5 output voltage
Im getting 80v at clip point...
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Re: QSC GX5 output voltage
Are you using one black and one red? That voltage is much higher than it should be for that amp.
80 volts would be 1600 watts at 4 ohms.....that's double the stated power. And while I don't doubt that you might get a little more from QSC amps.....it ain't that much.
80 volts would be 1600 watts at 4 ohms.....that's double the stated power. And while I don't doubt that you might get a little more from QSC amps.....it ain't that much.
6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210
"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."
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Re: QSC GX5 output voltage
Yea I have the multimeter hooked up to the output, black to black red to red. Over at the QSC forums they told me 80v is a reasonable clip point for that amp running a sine wave.
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Re: QSC GX5 output voltage
He gave me different info about running amps at full attenuation tho.. http://forum.qscservice.com/viewtopic.p ... e30#p21133
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Re: QSC GX5 output voltage
Respectfully....he's full of crap. Unless you have a way to keep the volume knobs at EXACTLY the same position ALL the time.....which you don't - then you need to know that they cannot be turned up. By keeping them all the way up - they can never be turned up any louder. By setting your limiter with them in that position, you will never blow your speakers. However, it you set your limiters with the volume knob anywhere but wide open - then your limiter means nothing the moment someone turns the knob up.ChrisMcCune wrote:He gave me different info about running amps at full attenuation tho.. http://forum.qscservice.com/viewtopic.p ... e30#p21133
You aren't living in the consumer world with these subs. You can't hear when a folded horn is getting too much, because the horn filters out the distortion that would normally tell you to turn 'em down. So, without a hard limiter - you'll have no indication that you are about to blow 'em until they are gone.
Tops are a different story, because you can hear when they are getting too much. However, if you are going to the trouble to limit them, then why sabotage yourself by allowing the limit to be bypassed by turning up the amp?
6 - T39 3012LF
4 - OT12 2512
1 - T24
1 - SLA Pro
2 - XF210
"A system with a few knobs set up by someone who knows what they are doing is always better than one with a lot of knobs set up by someone who doesn't."
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Re: QSC GX5 output voltage
He is absolutely right about the signal to noise ratio. In car audio/home audio or in a studio where the knobs are set once then forgotten, run your signal as hot as you can and your amps as low as possible to get the lowest noise floor. No question there about his method.ChrisMcCune wrote:He gave me different info about running amps at full attenuation tho.. http://forum.qscservice.com/viewtopic.p ... e30#p21133
However:
This is pro-audio, where we set up/tear down, transport, let other users play with the dials (either intentionally or inadvertently when a drunk turns into secret invisible sound guy), and having a sound system failure in a middle of a gig ruins everything. Once you lose your subs in the middle of an event that you were paid to provide for, all this will make sense. Even more so if the attendees paid to attend said event. This is your reputation on the line. Accidents happen, knobs get turned, faders slip. By having your amp gains maxed out when the limiter is set, then you (mostly) fool proof your system. The price you pay for an increase of system noise is negligible. Most amplifier system noise isn't in the subwoofer pass band anyways, you won't hear a difference. Tweeters yes, subwoofers never.
Ps: I read something about you worried about always being hard into the limiters at unity on the mixer because your amplifier puts out more than 50 volts and the gains are wide open. That's not true. You take down the subwoofer output gains in your driverack or DSP of choice to prevent that. You can set it so that at unity on your mixer you are just below the limiters kicking in for the subs. The limiters are your last line of defense in case of a mishap, you never want to run into them on purpose.
Built:
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience
17" width 10" driver Autotuba
2 x 29" width dual Lab12 Tuba60
6 x DR250 2510/asd1001
In progress:
2 x DR250 2510/asd1001
For best results, point the loud end of the array towards the audience
- BrentEvans
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Re: QSC GX5 output voltage
He's really not wrong Bruce... this is the right way to do it (technically) but you're right that you have to be able to control it. However... these are cheap and do the trick...Bruce Weldy wrote:Respectfully....he's full of crap. Unless you have a way to keep the volume knobs at EXACTLY the same position ALL the time.....which you don't ....ChrisMcCune wrote:He gave me different info about running amps at full attenuation tho.. http://forum.qscservice.com/viewtopic.p ... e30#p21133
http://www.sweetwater.com/store/detail/SEC2
Unless they have a screwdriver and are just super determined to get in there, they're not getting in there. If you're worried about the guy that has a multitool on his belt, buy these:
http://www.sweetwater.com/store/detail/HTX
And get yourself a security screwdriver for your toolbox.
There is ALWAYS a way to get around things without sacrificing performance.
Of course... the best thing to do is simply use amps that are roughly the right size for each speaker. That way you can limit and adjust gain structure in the DSP. If, though, you have to put a way-too-large amp on subs (or bridge a small one so it becomes a way-too-large one) whether permanently or in a pinch... you can do it without worrying.
99% of the time, things that aren't already being done aren't being done because they don't work. The other 1% is split evenly between fools and geniuses.