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Junior Varsity
QSC PL3 on subs
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<blockquote data-quote="Langston Holland" data-source="post: 41725" data-attributes="member: 171"><p>Re: QSC PL3 on subs</p><p></p><p>The PL380 has an amazing amount of voltage swing in bridged mode, but Bennett's right, in a perfect world you'd buy bigger amps that don't need to be run bridged. It's generally best to run amps at twice their lowest rated load impedance unless the mfg specifies the sweet spot for you such as Crown does for the ITech's.</p><p></p><p>Another downside that some folks mention is that bridged mode halves the nominal damping factor by doubling the amp output impedance. I think this reasoning is bogus because the standard damping factor equation is bogus. The truth is that the real electrical damping factor includes round-trip cable and voice coil resistances which makes the approx .02Ω impedance on each of the amp's positive output terminals a drop in the bucket.</p><p></p><p>If you want to experiment with bridging you can always do a one-sub shootout with the PL380 (I assume) you already have and see if bridged mode makes a significant difference or not. If you decide it's worth it, I'd use PL380's, not something smaller that will run closer to it's maximum output. Class D is a real advantage as well when you're driving an amp hard. You'll also need to provide a 30 amp supply for these things when bridged. If you find that the amp does not trip a 20 amp breaker in bridged mode, the sub is getting driven to its max with the PL380 in stereo mode.</p></blockquote><p></p>
[QUOTE="Langston Holland, post: 41725, member: 171"] Re: QSC PL3 on subs The PL380 has an amazing amount of voltage swing in bridged mode, but Bennett's right, in a perfect world you'd buy bigger amps that don't need to be run bridged. It's generally best to run amps at twice their lowest rated load impedance unless the mfg specifies the sweet spot for you such as Crown does for the ITech's. Another downside that some folks mention is that bridged mode halves the nominal damping factor by doubling the amp output impedance. I think this reasoning is bogus because the standard damping factor equation is bogus. The truth is that the real electrical damping factor includes round-trip cable and voice coil resistances which makes the approx .02Ω impedance on each of the amp's positive output terminals a drop in the bucket. If you want to experiment with bridging you can always do a one-sub shootout with the PL380 (I assume) you already have and see if bridged mode makes a significant difference or not. If you decide it's worth it, I'd use PL380's, not something smaller that will run closer to it's maximum output. Class D is a real advantage as well when you're driving an amp hard. You'll also need to provide a 30 amp supply for these things when bridged. If you find that the amp does not trip a 20 amp breaker in bridged mode, the sub is getting driven to its max with the PL380 in stereo mode. [/QUOTE]
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QSC PL3 on subs
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