Feature:
This amp has all the features I need. Peavey amps tend to have better features - cooling system is better in my opinion -- but the QSC has all the options I need with bridging, inputs, outputs, clip, etc.

Quality:
Constructed well, sound quality is good, and more amps per channel than Peavey amp, equal to Crown.

Value:
Between sound quality, amps per channel, construction, and features, QSC is the best value on the market.

Desirability:
No regrets - I will purchase QSC next time I'm in the market with my experience so far.

Sound:
I've used Peavey and Crown amps in the past to push our sound system (6 loudspeakers w/4 10" and 3 horns on each & 1 Peavey monster subwoofer) and have had good experiences. At the recommendation of a colleague I went with QSC this time around and am very impressed with the quality of sound. I think it is at least equal to my Crown, better than my Peavey.

Ease of Use:
Most good amps generally plug and play... this is no different.

Support:
Haven't had to deal with them.

Overall:
I'm very hapy with the product. Overall I rate it as high as I can.

Feature:
Infinite options using the dip switch setup on the rear. Bridging, crossover points, etc are all documented well on the case for on the fly adjustments without a manual. Speakon is a great feature, with the exception of channel two Speakon only will drive channel two on the amp.

Quality:
Extremely well built. Interior is very solid, with the torroidal transformer mounted directly to the chassis with each stage on either side. Wiring is clean and braided and PCB quality is on par with much more expensive amplifiers.

Value:
For the price, you won't find many amplifiers of this caliber. You really do get a lot for your dollar.

Desirability:
They look like a utilitarian power amp. Nothing really special. The rack ears are dual layer. The back portion is part of the chassis, while the front portion unbolts. This makes bring the unit back to decent cosmetic condition a snap. Beware tho, if you bend the ears beyond use, you'll have to replace the entire chassis as they are a part of the chassis.

Sound:
Overall sound quality is there, but the fan can be noisy. Keep this in mind if you plan to use this in a sound sensitive environment.

Ease of Use:
See above. Out of the box it will function the same as any 2 channel power amp. Further adjustment can be made on the rear.

Support:
I needed help repairing a unit after it fell quite some distance. An enginner researched which components I needed. QSC is one of very few who will sell replacement parts and assemblies, as well as including engineering drawings and schematics in the support section of their website.

Overall:
I would buy another. I'd like to see QSC put out a smaller 1U unit in the 100-150 watt range, and with passive cooling, (no noise in the studio.)

Feature:
turn it on and forget about it!

Quality:
we play 150 one night jobs a year-never had a problem-have the same units for backup (8 total amps) only use them on monitors. They stay loaded in our truck all year round and are subjected to extreme heat and cold.

Value:
yes

Desirability:
practical and affordable

Sound:
always great- very seldom have to adjust the eq.

Support:
no problems

Overall:
untill it wears out! meets all our requirements.

I use these amps in my monitor system, I can put a 2 ohm load on it and and drive it hard all night with no problems. Worth its wieght in gold.

This amp really is great. It has huge power reserves and a lot of features. The infrasonic filter, clip-limiter, and parallel input mode are wonderful. This amp is really made to power subs just as much as stereo loads. I can only praise QSC. I am using it to power a subwoofer and the RMX850 can keep up with my cinema-volume sub.

the rmx 850 has plenty of clean power. i run stereo mode with 8 ohm speakers and this amp dilivers more than enough bass. if i had the money, i would go with the rmx 1450 for a little more power. but for driveing full range cabinets the 850 does have enough power.

The FAN has to go.. retrofit needed. Noisy as no other.