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<blockquote data-quote="tinmanchris217" data-source="post: 5984170" data-attributes="member: 610505">Hey Guys,I had a strange occurrence during gain setting of my old amp the other day.&nbsp; Normally, this topic doesn&#039;t belong in the Sub&#039;s section, but I think it&#039;s enclosure-related unloading.Equipment:2x Pioneer Premier ts-w2501d4 (2.5 cf per, tuned @ 50 Hz) - handles 1600wRMS for bothLanzar Vibe 268 - puts out ~400w RMS @ 4 ohms, conservativelyPlenty of electrical for this ampGain Setting Time:So according to basic math, this amp should have a V_max &amp;gt;= Sqrt(400*4) = 40V across the terminals.&nbsp; I get to about 30 V on a 50 - 60 Hz tone and the woofer quickly transitions from stable and strong, to loose and bottoming out.I need to check the impedance of the woofers when this happens, but the phenomenon is repeatable, after you get above 30 V.I can&#039;t find a reasonable explanation for the first 300w to be well controlled, and magically it gets loose as a moose.&nbsp; I&#039;m not clipping the amp, and the woofers can handle much much more...My question:Since I have 10&#039;s in a big arse box, is it possible that the box dynamics to cause this?</blockquote>

[QUOTE="tinmanchris217, post: 5984170, member: 610505"] Hey Guys, I had a strange occurrence during gain setting of my old amp the other day. Normally, this topic doesn't belong in the Sub's section, but I think it's enclosure-related unloading. Equipment: 2x Pioneer Premier ts-w2501d4 (2.5 cf per, tuned @ 50 Hz) - handles 1600wRMS for both Lanzar Vibe 268 - puts out ~400w RMS @ 4 ohms, conservatively Plenty of electrical for this amp Gain Setting Time: So according to basic math, this amp should have a V_max >= Sqrt(400*4) = 40V across the terminals. I get to about 30 V on a 50 - 60 Hz tone and [B]the woofer quickly transitions from stable and strong, to loose and bottoming out.[/B] I need to check the impedance of the woofers when this happens, but the phenomenon is repeatable, after you get above 30 V. I can't find a reasonable explanation for the first 300w to be well controlled, and magically it gets loose as a moose. I'm not clipping the amp, and the woofers can handle much much more... My question: Since I have 10's in a big arse box, is it possible that the box dynamics to cause this? [/QUOTE]

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