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QSC PLX amps |
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colint 
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Joined: 06 October 2007 Location: United Kingdom Status: Offline Points: 5227 |
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 Topic: QSC PLX ampsPosted: 08 June 2008 at 12:26am |
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I have 2 plx amps 1 is a 3402 and the other a 1602,
I run the 3402 on a pair of 1 x 12 jbl loaded 1 x 12" cabs (2206 & 2426 comp) into 8ohms @ 700watts full range
and the 1602 bridged mono into 4ohms @ 1600 watts on pair of 1 x 18" ASS reflex cabs (2241hpl loaded) and even though I can run it up to clip with no problems (they do get a bit warm though) it doesn't seem that loud, has anyone else found these amps to be a bit down on there rated power?
My old EV p3000's although lower in power seemed to have much more grunt than the PLX amps and I never saw a clip light on either of the EV's!
is it the amps or am I just going deaf with old age?
Edited by colint - 08 June 2008 at 12:36am |
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SteveAATW
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Posted: 08 June 2008 at 3:55am |
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PLX struggle to do bass as do most budget/entry level class D designs
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bmw28
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Posted: 08 June 2008 at 4:24am |
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i run a plx 1602 on tops ev sx300 which sounded clear & loud, but had a plx 3402 on subs .. 2 x w b lines which i felt sounded flat on the bass. I think it goes back on the issue of light weight vs heavy weight amps... after swicth to a Crest CA 18 which took my bins to a other Dimension (pd1860 loaded)
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andyamp
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Posted: 08 June 2008 at 8:01am |
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colint
the plx amps are class H amplifiers.
on bench testing they are one of the few amplifiers that stand up to testing and pass.
on sound testing i found the same thing as you.
this is becouse there is a big differance between the size of the ferrite transformer needed to give Big bottom end and rms.
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a wise man changes his mind a fool does not.
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colint
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Posted: 08 June 2008 at 8:35am |
Hi Andy I was quite happy with the sound quality, it was the total lack of power I was supprised with, when using the 3402 on bass @ 8ohms the amp was trully gutless and went up to clip real easy in a small room with about 100 punters in?
when I changed the amps around with 3402 on tops and bridged the 1602 tha system really came alive quality wise but still didnt sound like the 3200 watts the cabs were supposed to be getting, in fact I ran it up to just under clip for about 6 hours with no adverce effect to the speaker system all 4 cabs are rated at 600 watts each!
I think I need to suffer the weight and get the transformered amps back out!
Model Watts per channel 8 Ω: 20 Hz–20 kHz, 0.03% THD4 Ω: 20 Hz–20 kHz, 0.05% THD2 Ω: 1 KHz, 1% THDPLX 8Ω 4Ω 2Ω1602 300 @ 8ohms 500 @ 4ohms 800 @ 2 ohms3402 700 @8 ohms 1100 @ 4ohms 1700 @2 ohms A little overrated methinks?
Edited by colint - 08 June 2008 at 8:50am |
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Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes!
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andyamp
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Posted: 08 June 2008 at 10:24am |
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I know what you mean,i have tested a lot of amps as well as made lots.
testing shows that to fix this on an smps amplifier it needs to have a Big ferrite transformer.
i am testing a ukp amp at the moment with a big ferrite.
twice the size needed to do the rms output.
and this amp does bass.
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a wise man changes his mind a fool does not.
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dwsound
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Posted: 08 June 2008 at 1:41pm |
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hi
re the PLX amps, it does state in the manuals, that the amplifier will only do its rated output at 2 ohms for a "optimum" time then the power supply limits the output. so your 1700w is more likely to be half that- i belive this is only at its 2 ohm rating- i certainly remember this was the case on the original PLX's dan |
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ceharden
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Posted: 08 June 2008 at 1:53pm |
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Has anyone compared the PLX with the Powerlights? Eg PLX 3602 vx PL340? I'm assuming the Powerlights would be better, not being the 'cut down' version?
I'm wondering whether to get something like a PL340 for bass then use PLX's on mid-tops to keep the cost down. |
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colint
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Posted: 08 June 2008 at 5:02pm |
It's class H and at the last price of over £900.00 for the 3402 hardly budget or entry level
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Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes!
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SteveAATW
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Posted: 08 June 2008 at 5:19pm |
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Sorry early morning dunce moment, its the touring Powerlight series that are D
By budget/entry level I meant in comparison to the other lightweight amps - ie they're about 1/3 of the price of the touring amps. PLX is to PL what Crowns XTi is to the I-Tech etc - the amp manufacturers are never going to make or allow the cheaper lightweights to outperform their bigger brothers, chances are they will engineer them not too. Bass seems to be the test which defines how good an amp is and pound to a penny most of the budget lightweights, whilst competent at sub, don't exactly set the world alight with it. |
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colint
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Posted: 08 June 2008 at 9:00pm |
I think in general switchmode amps are ok for mid/hi's and fold back and that's about it
these are the second lightweight amps I have "invested" in the first being the carver pm1.5 and neither could cut it?
in fact the carvers turned out to be not much more than hi-fi amps in a rack format so it looks like I'm going to be dragging out the austin armstrong's I have in reserve until I can find a pair of EV P2000's they're Bloody heavy but at least I know they'll never let me down and do what i want!
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Never criticise another man until you've walked a mile in his shoes. Once you have, call him what you like, you're a mile away and you've got his shoes!
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toastyghost
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Posted: 08 June 2008 at 9:05pm |
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Lab Gruppen amps seem to do the business on sub, every time I've heard them.
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andyamp wrote: