QSC Amp Questions

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Stephen W

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Can someone explain the differences between the lines of products from QSC? I am lost as to the "real" differences from the RMX, PLX, Etc. series.

Also, would anyone recommend Crown over QSC?

Thanks for any input guys (and gals!)

-- Stephen
 

djstevieray

Somewhere On Hoth
RMX-Their "beginner" amp. Good quality at a great price. Uses heavier power supplies.
PLX-Light weight amps. Use a switching power supply. They go up to the 3402 extremely powerful, and still only weighs 21 lbs.
PL & PL2 series-This is their touring series of light weight amplifiers. They are between 18-34lbs depending on model (pl or pl2) and power output. These babies are the most expensive, but also give you the most features, and some of the highest output of any amps available.

For mobile work the PLX are usually the preffered series. Leight weight and power output that fits almost any need for mobile work. The RMX are good as well for mobiles, especially if your on a tighter budget, but remember that the money you save on the amps you may pay later for chiropractic bills. Also except for the RMX-1850HD the RMX line are not particularly suited for driving 2ohm loads. I usually recommend the PLX.

The Crown vs. QSC issue depends on many things. If you could give us a little more info like budget, power requirements, and the load you would be putting on the amp. Either myself or someone else here would be better qualified to recommend the best amp for your situation. Also don't forget their are other amps out there that compare favorably to the amps your asking about as well.

Compare RMX to the American Audio Plus line.
Compare the PPLX to the Crest Audio LT or better yet the ST series of amps.

So as I said if you give a little more info, I can help you a little better. Its a great time to be a DJ looking for any equipment. There is a perfect Amp, CD Player, Mixer for just about any given situation and budget.
 

Tom Hamkens

New Member
The "real" differences in QSC amps is the power supply. The RMX series uses a toroidal transformer, the PLX uses the Powerwave power supply also found in the PowerLight. With the different power supplies, comes different weights. That's why QSC can put out a much more powerful amp than Crown that weighs a lot less. Crown doesn't make an amp that compares to the QSC PowerLight series in either output, small size or low weight.

I've been using QSC amps for over 15 years and I won't buy anything else. I've got racks of MX's, PLX's, PL's, RMX's and USA's that I have never had cleaned or any maintenance to them that fire up and crank out the tunes whenver they're needed. I installed 3 USA series amps in a casino a few years back that have never been turned off. They are on 24/7 and have never had a problem.
 

Tom Hamkens

New Member
If it's not available in North America, then I don't worry about it. Also, these amps plug into 220V service to get these outputs not 110V like the PL's. I didn't see anywhere what kind of amperage they draw. So, let's compare apples to apples, OK?

Contractor amps don't count since they're not made for the rigors of the road.
 

Brandon Fisher

Active Member
I think the questions have been answered but my .02 is that no I would not compare a QSC to a Crown in the higher level lines.
 

Darrell Osborne

New Member
I've used Crown amps for quite a few years, without any problems and have been happy with them. But, I just bought 2 PLX3402, which I have had for about a month, that have impressed me as well. I went with QSC because I can get a higher output amp for less money, less weight, and I believe it draws less current from the outlet. The quality Crown amps are a little more expensive, heavier and, once again I'm not sure, but I believe they draw more current from the wall due to the power supply. But when you have that Crown hooked up to your sub, it definately pushes it. I don't have enough experience yet with the QSC's to say the same.

I wouldn't say one is better than the other without saying what it is better for. There are advantages to both, but I see more advantages to the mobile DJ side for QSC.
 

Brandon Fisher

Active Member
rollinjukebox said:
Brandon Fisher said:
I would not compare a QSC to a Crown in the higher level lines.
You're right, there is no comparison. :D
Just to clarify I support Crown 100%.

Darrell,
I can run both my K2's at full tilt off of a 20amp circuit given there is nothing else on it.. They only pull 8amps each. The Macro Tech's, Power Tech's, Power Base's are a differetn story those pull a ton of power.
 

Tom Hamkens

New Member
The K2 is comparable in output to the RMX 2450 or the PLX 3002. The 2450 draws only 7 amps and the 3002 draws 10 amps. I can't find anywhere in the K2 PDF file that states amperage draw. The PLX weighs 21 lbs., the RMX weighs 44.5 llbs and the K2 weighs 38 lbs. So comparing the 3 amps, the PLX 3002 wins because of the 17 lb weight difference and the slight edge in wattage output.
 

Brandon Fisher

Active Member
Its on the back of my amps that has the draw. When weight is not a concern I choose the Crown. If weight is an issue in equation then the QSC wins on weight.
 

Stephen W

New Member
Thanks for your help guys! Actually, they are for an install, so power and weight are not really an issue. Reliability is my top concern! Thanks again!
 

Brandon Fisher

Active Member
How many are you going to be getting? What speakers will you be powering? and How much electrical power do you have available for the amps and other gear? What is the budget?
 

djstevieray

Somewhere On Hoth
Brandon Fisher said:
How many are you going to be getting? What speakers will you be powering? and How much electrical power do you have available for the amps and other gear? What is the budget?
Didn't I say that? :wink:

Anyway for an installation I would lean more towards either Crown Macro-Techs, or the Contractor series. Although the PL2 are another good choice. I have seen Micro/Macro-Techs that have been in club installs 15+years now, with no problems.
 

NickyB

Gear and Equipment Moderator
I wouldn't hesitate to compare Crown's to QSC's. There is amp that compares in any power category but you do have to compare apples to apples. You want Crown MacroTech power and performance then compare them to the QSC PL touring series. Compare Crown K series with the PLX's and the Crown CE series to the RMX's.

Crowns are great for driving subs but they are very current hungry and work fantastically in a fixed installation. For mobile DJ work, things are a little different. You don't know from venue to venue what your power availability will be so in this case less demand is more!

The 'key' specs to look at in amps are:
1 - Continuous(rms) watts/channel into 4/8 ohm loads for the full audio range (i.e. 20-20K)
2 - Total Harmonic Distortion (THD) should be less than .1% full range
3 - Damping Factor - minimum 200; higher is better
4 - Weight if its an issue; mobiles want light, Perm install usually doesn't matter.

Expect to pay for quality and every manufacturer generally has models that fit into high, mid and budget quality criteria.

NickyB
 

Tom Hamkens

New Member
QSC amps are just as good at driving subs as Crown and yet they're not as power hungry.

Just so you know, I have nothing against Crown except that they are power hungry and they weigh too much. Even when doing installs, I don't want to have to lift them heavy SOB's. For club installs, the contractor series of amps, Crown, QSC or other brand, are not the amps you're looking for. Most C series amps have outputs in volts instead of watts. Notice: I said most, not all. Some C series amps do both but still not what you're looking for since they're low wattage amps. They're usually designed for distribution systems.

For club or church installs, I normally recommend the PLX series of amps by QSC or if money is no object, I recommend the PowerLight series by QSC.
 

dj kf

New Member
First off I've been using crown macrotechs for years and I've never had any problems with them. I feel that you need to listen to switching power supply amps, and conventional amps back to back and do some testing (under different stress conditions)to decide which ones you like the best. Many of the top sound companies around the world feel that the macrotech 5000/5002 are some of the best sub amps ever made and I have to agree. Thomas will tell you that their is no difference in the sound of the two types but as I said either listen yourself or talk to someone that knows what they are talking about. I know that Thomas will start talking trash about the pl 9 but its unfair to compare the power of that amp to the 5002, try comparing it to the pl 6.0 or 6.0II and I think that you will be impressed with the crown. I have two friends that own huge eaw and turbosound rigs that have just gotten rid of their pl 9.0's and went back to the old heavy macro 5's. Also theirs a couple of new competitors to the US market in the switching power supply class the lab gruppen fp6400 and the camco vortex 6. I've picked up 4 lab gruppen fp6400's over the last couple of months and I'm impressed so far 5000 watts and just 21 pounds.
 

Tom Hamkens

New Member
I would never talk trash about the QSC PL 9. Why in world would I do that? I do just the opposite. Find me a Crown amp that compares to the PL 9. Betcha can't do it!

If you really think that Crown amps push subs better than QSC well, go ahead and think that. I'll let you. Do a blind A/B of comparable QSC and Crown amps pushing the same set of speakers, using the same processing gear and I'll bet you that you can't tell the difference. I'm not the only one that knows this.
 

Brandon Fisher

Active Member
Well I guess because Mom and I have done the blind test it can't be done. Oh well, I will never be able to convince anyone of that.
 
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