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<blockquote data-quote="amf83" data-source="post: 33982" data-attributes="member: 543340">The Setup:&nbsp; I just bought a kappa 120.1SE (has a rating of 300w RMS) and a sony Xplod 760w amp which runs 380w RMS at 4 ohm to the sub.&nbsp; The kappa is in a 1.1cu. ft. box; all wiring is the right guage, good connections, etc.&nbsp; Polyfil liner in the box.&nbsp; Amp low pass filter is set at 90hz.&nbsp; Gain and boost are at factory default.The Problem:&nbsp; The sub handles really low test frequencies great...plays them loud and clear; some songs and types of music play okay.&nbsp; I am interested in SQ not SPL.&nbsp; However, at moderate/low volume and higher, many songs/sounds cause the sub to distort with a buzz that comes from around the edge of the speaker.&nbsp; It&#039;s not any physical vibration in the car--it is coming from the driver.&nbsp; This can only be heard if you are in the back seat near the sub.&nbsp; From the front, everything sounds very good.&nbsp; I do not know if this buzzing, almost snapping sound is normal.&nbsp; It seems to occur more often at the higher end of the crossover frequency with bass that isnt real low.&nbsp; The 40hz range is fine.Thoughts:&nbsp; It looks to me like the speaker is travelling too much-- it really gets moving even at low volume.&nbsp; This sounds like &#039;clipping&#039; but the amp is matched well on power.&nbsp; Any ideas on what to do to fix the problem?&nbsp; Because I do not hear it with the trunk pass-through closed or when I am in front, it&#039;s not a sound issue, but this sound doesn&#039;t seem normal so I am thinking it might be damaging the sub, eventually.&nbsp; Help! This is my first install and I did my homework....-adam</blockquote>

[QUOTE="amf83, post: 33982, member: 543340"] The Setup: I just bought a kappa 120.1SE (has a rating of 300w RMS) and a sony Xplod 760w amp which runs 380w RMS at 4 ohm to the sub. The kappa is in a 1.1cu. ft. box; all wiring is the right guage, good connections, etc. Polyfil liner in the box. Amp low pass filter is set at 90hz. Gain and boost are at factory default. The Problem: The sub handles really low test frequencies great...plays them loud and clear; some songs and types of music play okay. I am interested in SQ not SPL. However, at moderate/low volume and higher, many songs/sounds cause the sub to distort with a buzz that comes from around the edge of the speaker. It's not any physical vibration in the car--it is coming from the driver. This can only be heard if you are in the back seat near the sub. From the front, everything sounds very good. I do not know if this buzzing, almost snapping sound is normal. It seems to occur more often at the higher end of the crossover frequency with bass that isnt real low. The 40hz range is fine. Thoughts: It looks to me like the speaker is travelling too much-- it really gets moving even at low volume. This sounds like 'clipping' but the amp is matched well on power. Any ideas on what to do to fix the problem? Because I do not hear it with the trunk pass-through closed or when I am in front, it's not a sound issue, but this sound doesn't seem normal so I am thinking it might be damaging the sub, eventually. Help! This is my first install and I did my homework.... -adam [/QUOTE]

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