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Author Topic: qsc plx amps  (Read 8038 times)

Gareth James

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qsc plx amps
« on: December 18, 2004, 07:01:12 pm »

Can anyone tell me how reliable a PLX1602 would be operating into a 4ohm mono bridge mode to power a sub?
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ChainedDragon

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Re: qsc plx amps
« Reply #1 on: December 18, 2004, 11:54:43 pm »

should run just great


They'll run fine in 2ohms even, as long as you dont push them to hard
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Weogo Reed

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Re: qsc plx amps
« Reply #2 on: December 19, 2004, 11:32:22 am »

Hi,

To clarify:

"They'll run fine in 2ohms even, as long as you dont push them to hard"

Note, the original post said 4 ohms BRIDGED.
This is the same to the amp as running 2 ohms STEREO.

The PLX2602 will NOT do 2ohms BRIDGED.  Very few amps will.

For long life, I would not push the 1602 hard at either 4 ohms bridged or 2 ohms stereo.

Good health,  Weogo
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Gareth James

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Re: qsc plx amps
« Reply #3 on: December 19, 2004, 01:49:22 pm »

So whats the deal? How can i get enough power (~1600W) into my 4ohm sub? I cant afford crown MA's!!
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Mike MacWillie

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Re: qsc plx amps
« Reply #4 on: December 19, 2004, 02:55:01 pm »

The plx should be fine at 4 ohms bridged.. You could also use an rmx 1850HD, it was built to run at 4 ohm bridge all day long.. and It'll give you 1800 watts @ 4 ohm bridged.
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Evan Kirkendall

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Re: qsc plx amps
« Reply #5 on: December 19, 2004, 09:11:49 pm »

I dont see why you would have any problems running the amp at 4 ohms bridged. QSC has a great reputation and I havent seen many of their amps fail, even under some of the worst conditions.
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bgavin (Bruce Gavin)

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Re: qsc plx amps
« Reply #6 on: December 20, 2004, 10:16:56 am »

The RMX 1850HD is specifically optimized for 2 ohm stereo operation.  It has larger heat sinks for this severe load.  The downside is the 43-odd pounds, instead of 21 pounds for the PLX.  The 1850HD is less expensive though.
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Mike {AB} Butler

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Re: qsc plx amps
« Reply #7 on: December 23, 2004, 02:02:42 pm »

kaisersoze wrote on Sat, 18 December 2004 16:01

Can anyone tell me how reliable a PLX1602 would be operating into a 4ohm mono bridge mode to power a sub?


As a PLX owner who has used a 1602 many times for sub duty, I can tell you that the amp works great at 4 ohms bridged, and is VERY reliable - first amp I ever took a chance to run that hard, and it delivered! I can also say that 1600W on subs is barely enough for even small gigs; more is better.
Some people don't like the PLX on subs, but I think they're just fine.
Regards,
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Mike Butler,
Principal, Technology and Operations,
Dascott Technologies, LLC

Tim Padrick

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Re: qsc plx amps
« Reply #8 on: December 23, 2004, 09:45:09 pm »

My choice would be a used K2 (about 2400w bridged into 4 Ohms, 38 pounds, $800-ish on eBay) if you can conveniently add a bit of forced air cooling to your rack.  

Gareth James

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Re: qsc plx amps
« Reply #9 on: December 24, 2004, 09:13:46 am »

Well i get the impression either the RMX1850HD or PLX1602 is the way to go since i dont want to have to mod my amp rack for extra cooling.

There are a couple of things im still not clear on however. A no. of posts are telling me 1600W is not enough for subs, doesnt that depend on the sub?! Apart from this im going to be running this amp real hard as it will be used occasionally for a drum and bass night. If im exceeding the long term capabilities of my drivers im surely not going to get more sound because of power compression and probably running the risk of voice coil failure?

Also isnt running at 2400W compared to 1600W only an inaudible 1.5dB rise or are the equal loudness curves having some effect here?

OR will the music still have enough peaks (even when run through LMS compression) to stop full sine power getting through?

Excursion is not an issue here, the drivers are only pushing 20mm max at 750W with a >30mm max. This figure should be even lower with a steep rolloff just above this point.

Sorry to ramble on again but i want to get this as right as right can be!

Thanks to all who have lent their advice and shared the knowhow, its much appreciated!! Very Happy
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