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<blockquote data-quote="thylantyr" data-source="post: 3031137" data-attributes="member: 560358"><p>If you are driving 8 ohm speakers, you can probably install a</p><p></p><p>toggle switch to disable the fan. It's an easy load. I wouldn't</p><p></p><p>expect much heat generated, it's a more efficient class H design, a</p><p></p><p>class AB amp with two tier power supply.</p><p></p><p>I remember reading about people using the Crown XLS402 {big AVS thread},</p><p></p><p>some folks just disconnect the fans, many did the fan mod to reduce fan</p><p></p><p>speed which reduces air flow, a few replaced the fans with 'quiet fans'</p><p></p><p>which too is CFM limited.</p><p></p><p>.. and XLS {version A - C amps} had very crappy heatsink design.</p><p></p><p><a href="http://home.pacbell.net/lordpk/proamps/Crown_XLS-402A.jpg" target="_blank">http://home.pacbell.net/lordpk/proamps/Crown_XLS-402A.jpg</a></p><p></p><p>XLS version D is better.</p><p></p><p><a href="http://home.pacbell.net/lordpk/proamps/Crown_XLS-402D.jpg" target="_blank">http://home.pacbell.net/lordpk/proamps/Crown_XLS-402D.jpg</a></p><p></p><p>.. but PLX is even better.</p><p></p><p><a href="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-3.jpg" target="_blank">http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-3.jpg</a></p><p></p><p>Those are very good sinks.</p><p></p><p>If you disable the fan, it should work fine.</p><p></p><p>or just remove the fan/shroud housing to allow the sinks to vent better,</p><p></p><p>convection cooling.</p><p></p><p><a href="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-5.jpg" target="_blank">http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-5.jpg</a></p><p></p><p>amp with fan/shroud in place;</p><p></p><p><a href="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-1.jpg" target="_blank">http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-1.jpg</a></p><p></p><p>You know, there are many PLX's on the used market, they've been in the</p><p></p><p>field forever. Now that PLX2 and PL3 came to market, the PLX users get</p><p></p><p>the upgrade itch and will sell PLX at lower prices than the last year or two</p><p></p><p>to get the latest model. But PLX2 is 99.9% the same as PLX in regards to</p><p></p><p>the power and amp stages. lol ..</p><p></p><p>So... my point is. Lets say you snagged one for $600... Try it out for a few</p><p></p><p>months. If you don't like it, put it back on ebay and get 90% of you money</p><p></p><p>back.</p><p></p><p>QSC resale value is good.</p><p></p><p>You can operate these amps at 2 ohm/ch {4 ohm bridged}, but if the system</p><p></p><p>is active, I drive under 1 ohm load on tweeters in bridged mode and 2 ohm midranges</p><p></p><p>in bridge mode, but you can cheat like this running woofers. The amp is robust</p><p></p><p>enough to handle some abnormal situations, other amps will complain {QSC RMX, Crown XLS,</p><p></p><p>Behringer EP series, and I doubt the new Crown XTI can hang from the internal pics I've seen, etc}.</p></blockquote><p></p>
[QUOTE="thylantyr, post: 3031137, member: 560358"] If you are driving 8 ohm speakers, you can probably install a toggle switch to disable the fan. It's an easy load. I wouldn't expect much heat generated, it's a more efficient class H design, a class AB amp with two tier power supply. I remember reading about people using the Crown XLS402 {big AVS thread}, some folks just disconnect the fans, many did the fan mod to reduce fan speed which reduces air flow, a few replaced the fans with 'quiet fans' which too is CFM limited. .. and XLS {version A - C amps} had very crappy heatsink design. [URL="http://home.pacbell.net/lordpk/proamps/Crown_XLS-402A.jpg"]http://home.pacbell.net/lordpk/proamps/Crown_XLS-402A.jpg[/URL] XLS version D is better. [URL="http://home.pacbell.net/lordpk/proamps/Crown_XLS-402D.jpg"]http://home.pacbell.net/lordpk/proamps/Crown_XLS-402D.jpg[/URL] .. but PLX is even better. [URL="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-3.jpg"]http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-3.jpg[/URL] Those are very good sinks. If you disable the fan, it should work fine. or just remove the fan/shroud housing to allow the sinks to vent better, convection cooling. [URL="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-5.jpg"]http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-5.jpg[/URL] amp with fan/shroud in place; [URL="http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-1.jpg"]http://home.pacbell.net/lordpk/proamps/QSC_PLX3402-1.jpg[/URL] You know, there are many PLX's on the used market, they've been in the field forever. Now that PLX2 and PL3 came to market, the PLX users get the upgrade itch and will sell PLX at lower prices than the last year or two to get the latest model. But PLX2 is 99.9% the same as PLX in regards to the power and amp stages. lol .. So... my point is. Lets say you snagged one for $600... Try it out for a few months. If you don't like it, put it back on ebay and get 90% of you money back. QSC resale value is good. You can operate these amps at 2 ohm/ch {4 ohm bridged}, but if the system is active, I drive under 1 ohm load on tweeters in bridged mode and 2 ohm midranges in bridge mode, but you can cheat like this running woofers. The amp is robust enough to handle some abnormal situations, other amps will complain {QSC RMX, Crown XLS, Behringer EP series, and I doubt the new Crown XTI can hang from the internal pics I've seen, etc}. [/QUOTE]
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