Davi

It worked well, I put it between the SVP and the power amp

TUBE ULTRAGAIN MIC100 User Manual 5. Specifications XLR Input Connector balanced/unbalanced Type transformerless, DC-decoupled input Impedance approx. 2 kΩ Max. input level +7 dBu / -20 dB with pad ¼" TRS Input Connector balanced/unbalanced Type transformerless, DC-decoupled input Impedance approx. 1 MΩ Max. input level +16 dBu / -20 dB with pad Audio Outputs Connectors XLR connector + ¼" TRS jack balanced/unbalanced Type transformerless, DC-decoupled output Impedance approx. 700 Ω balanced, approx. 350 Ω unbalanced Max. output level approx. +26 dBu @ 100 kΩ

Ive got this tube preamplifier that I use at home, im wondering if this would solve the issue

Would a boost pedal between the pre and power amp solve the volume issue ?

There is very little technical information in the SVP-CL manual, it doesnt mention anything about the output level

Im using a speakon to jack for the first cab then daisy chaining the next cab speakon to jack to get a 4ohm parallel connection. The manual also gives the option of balanced jack. Ive been using unbalanced jack, tonight I will try a balanced jack to see if the 20kohm (balanced) to 10kohm (unbalanced) makes much difference.

Ive got 2 QSC 1850hd Power amps, im considering selling them both and buying something that has the option of changing the input sensitivity from .775 to 1.5v

Yes, that brings everything to 8ohms and even less headroom

It does seem that way, if it wasnt for the boost from spectracomp compressor on my pedal board it would be completely useless for band rehearsal

Yes and full on the preamp output also

Hi, Im currently using an Ampeg SVPCL preamp into a QSC 1850hd power amp, into 2x8ohm cabs daisy chained single channel with parallel switches engaged on the power amp, ive noticed the output of the Ampeg is very low and is possibly due to a voltage mismatch. What would be a good solution to this problem ? Maybe adding an EQ between the preamp and power amp or perhaps a boost pedal at the end of the pedal chain, im not sure. Any help would be appreciated. Many thanks