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<blockquote data-quote="mercmilan" data-source="post: 7405128" data-attributes="member: 634736">Hi,I have seen it briefly mentioned in a thread or two before but other than an offhand comment not too much attention has been paid to this issue.The MB Quart ONX4.125 is a highly recommended budget-friendly amplifier that I was planning on utilizing to power a pair of front door components (channels 1&amp;amp;2) and then bridging channels 3/4 to power a 12&quot; SSA DCON with 250w RMS of power.After doing a little more research I know see the issue where the ONX4.125 has no subsonic filter setting so apparently you must use the hi-pass crossover as one. Ive seen people say that the subsonic filter needs to be set for around 47-40 or 45 at most. But the high-pass crossover is only 60-13,000Hz. Will this amp be sending many frequencies to my sub that it will be unable to replicate? How can I prevent this issue -- is there an inexpensive &quot;subsonic filter&quot; that I can add in somewhere? some line drivers have them.. thoughts?</blockquote>

[QUOTE="mercmilan, post: 7405128, member: 634736"] Hi, I have seen it briefly mentioned in a thread or two before but other than an offhand comment not too much attention has been paid to this issue. The MB Quart ONX4.125 is a highly recommended budget-friendly amplifier that I was planning on utilizing to power a pair of front door components (channels 1&2) and then bridging channels 3/4 to power a 12" SSA DCON with 250w RMS of power. After doing a little more research I know see the issue where the ONX4.125 has no subsonic filter setting so apparently you must use the hi-pass crossover as one. Ive seen people say that the subsonic filter needs to be set for around 47-40 or 45 at most. But the high-pass crossover is only 60-13,000Hz. Will this amp be sending many frequencies to my sub that it will be unable to replicate? How can I prevent this issue -- is there an inexpensive "subsonic filter" that I can add in somewhere? some line drivers have them.. thoughts? [/QUOTE]

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