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<blockquote data-quote="Jimi77" data-source="post: 8845338" data-attributes="member: 673702"><p>I'll echo what others have said:</p><p>1) Sounds like the amp is okay. I think that amp is fine for those subs.</p><p>2) Enclosure is way too small for those subs. IMHO those subs belong in 1.5cuft each, if not closer to 2cuft/sub. (High QTS & VAS). Those would be good subs for an infinite baffle set up, terrible subs for an under the seat enclosure with very little airspace. That enclosure (airspace) screams 10s to me. </p><p>3) Sounds like you isolated the problem to the subs/enclosure.</p><p></p><p>The lack of airspace might be the cause of the problem but it's hard to say. Check for air leaks. Make sure the subs are wired in phase. Try disconnecting one of the subs and see if the distortion goes away. Make sure the amp is set up properly. LPF set to ~100hz. SSF to off. Make sure the hi/low input is in the correct position. Turn bass boost to 0db and boost frequency to ~30-40hz. You can use that bass boost circuit to boost the low end that the box is certainly cutting off, but I'd keep it to ~3db and no more or he'll end up cooking his subs. Try removing the subs from the enclosure and playing them free air to see if the distortion is still present.</p></blockquote><p></p>
[QUOTE="Jimi77, post: 8845338, member: 673702"] I'll echo what others have said: 1) Sounds like the amp is okay. I think that amp is fine for those subs. 2) Enclosure is way too small for those subs. IMHO those subs belong in 1.5cuft each, if not closer to 2cuft/sub. (High QTS & VAS). Those would be good subs for an infinite baffle set up, terrible subs for an under the seat enclosure with very little airspace. That enclosure (airspace) screams 10s to me. 3) Sounds like you isolated the problem to the subs/enclosure. The lack of airspace might be the cause of the problem but it's hard to say. Check for air leaks. Make sure the subs are wired in phase. Try disconnecting one of the subs and see if the distortion goes away. Make sure the amp is set up properly. LPF set to ~100hz. SSF to off. Make sure the hi/low input is in the correct position. Turn bass boost to 0db and boost frequency to ~30-40hz. You can use that bass boost circuit to boost the low end that the box is certainly cutting off, but I'd keep it to ~3db and no more or he'll end up cooking his subs. Try removing the subs from the enclosure and playing them free air to see if the distortion is still present. [/QUOTE]
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