QSC GX 7 used in my rig
Posted: Sun Sep 10, 2017 8:00 pm
Time has gone by and I have run quite a few live band shows very successfully using 4 X Titan 39's "V" plated powered with a QSC GX 7 through a Driverack PA 2 with appropriate limiter settings.
For tops I use the two DR 250's powered with a QSC GX 5.
All stage monitors, two WH 8's and two WH 10's powered with a pair of QSC GX 3's.
I use a mono pair of WH 8's for front fills set on top of the subs powered with another GX3.
Using the above rig for live bands I would have to say it is THE best live sound rig of it's size anywhere in my area. Also with live bands I never hit the limiters or see the clip light on any amps light up, the rig runs effortlessly.
However more recently I have run into electronic musicians and modern pop music which includes a lot of 30 hz and so have just finished building a Tuba 60 27" wide with a lab 15 and love it for this kind of music. I plan on having two of these in the future. However, the GX7's clip light flashes frequently on the bass drops and for this type of material I feel that the GX 7 is being flogged even though the limiter is still set to a conservative 55 volts within the PA 2 (lab 15 can have 60v) and the high pass is set to 25 hz.
Doing the math 60 volts into 8 ohms is only 450 watts, which the GX 7 should do 725 watts stereo @ 8 ohms. I understand it takes a lot more watts to reproduce the frequent excursions into 30 hz this music includes.
SOOOO.. why is my amp working too hard with this type of music when it seems appropriate from the math and do I need another larger wattage amp for this purpose?
For tops I use the two DR 250's powered with a QSC GX 5.
All stage monitors, two WH 8's and two WH 10's powered with a pair of QSC GX 3's.
I use a mono pair of WH 8's for front fills set on top of the subs powered with another GX3.
Using the above rig for live bands I would have to say it is THE best live sound rig of it's size anywhere in my area. Also with live bands I never hit the limiters or see the clip light on any amps light up, the rig runs effortlessly.
However more recently I have run into electronic musicians and modern pop music which includes a lot of 30 hz and so have just finished building a Tuba 60 27" wide with a lab 15 and love it for this kind of music. I plan on having two of these in the future. However, the GX7's clip light flashes frequently on the bass drops and for this type of material I feel that the GX 7 is being flogged even though the limiter is still set to a conservative 55 volts within the PA 2 (lab 15 can have 60v) and the high pass is set to 25 hz.
Doing the math 60 volts into 8 ohms is only 450 watts, which the GX 7 should do 725 watts stereo @ 8 ohms. I understand it takes a lot more watts to reproduce the frequent excursions into 30 hz this music includes.
SOOOO.. why is my amp working too hard with this type of music when it seems appropriate from the math and do I need another larger wattage amp for this purpose?