Subwoofers fades on low frequencies

I've got 2 x 12" Kenwood Typhoons installed in a sealed enclosure and they're hooked up on to a 2000 Watt monoblock Amp and gain is set about 30% . Whenever I play mp3s/songs with exstremely low bass tones/frequencies (like rap/hip hop type) it fades out. It almost makes like a funny rumbling noise. Could it be that there's not anough ampage to the subs or could it be a setting on the crossover ?

Thanks

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"when it's too loud, you're too old..."

what kind of HU are you running?

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I sometimes here a low rumbling noise as well but my bass is not fading out. I have no idea what is causing it. I've checked all the wiring and it all seemed fine. My noise is random but it is very low frequency. It can occur with the CD on "Pause" with the engine on or off. It stops as suddenly as it starts. Wierd!

I am running an Alipine CDA-9831 head unit.

Mike

ss-installer wrote:

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what kind of HU are you running?

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I have the JVC KD-LHX501 Touch/Voice Mp3/WMA Head Unit.

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"when it's too loud, you're too old..."

check your ground and make sure it has a good connection (scrape the hell out of the paint). make sure your RCAs are tight .

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It is most likely the MP3... MP3's TRASH low and high frequencies, and, well, they are not very nice to mids, either. Another thing could be your enclosure. If the Q of the system is too low or too high, the response gets really nasty - either peaky or too fast a roll-off. Does your amp have a subsonic filter (either fixed or adjustable) and is it on? If it is on, turn it off if possible. My first thought was the MP3, though...

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It all reminds me of something that Molière once said to Guy de Maupassant at a café in Vienna: "That's nice. You should write it down."

Nope it also happens with normal audio CDs... I'll play around with the settings and so on and I'll have a look for that subsonic filter. I'll try and re-adjust the ground, but seems fine. Thanks

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"when it's too loud, you're too old..."

Check the range of your subwoofers, its usually 20hz-250/300hz. If the songs are going lower than that, the subs have nothing to play. The seems to be enough amperage, also check the frequency output on your amp as well, make sure its down low. and check to see if ur amp has a built in crossover, and check its setting as well.

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1987 Nissan 300ZX N/A
1994 Audi 90 Quattro CS

Oh yeah, make sure its set to LPF. And check your head units built in crossover settings. set to to a preset bass level.

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1987 Nissan 300ZX N/A
1994 Audi 90 Quattro CS

I'm confirming that there is a built in crossover... I've got both LPF and HPF. The LPF is set to full and the HPF is set to low. Then there's a couple of other settings, but I'm not sure about them. I'll have a look later and tell you what they are. The ground is perfectly grounded so I reckon it is a setting on the crossover ? I've got a seperate 2/3 way crossover aswell between my 2000 Watt monoblock for my subs and my 700 Watt Calibra wich feeds my 6 x 9" Kenwoods.

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"when it's too loud, you're too old..."

You keep saying you have a 2000w monoblock. Which amplifier is it? How do you have the subs wired?


Does this happen at low volume levels?

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New Project: 2003 Pathfinder

It is a Starsound SSA-4150 2000 Watt x 4 Channel.

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"when it's too loud, you're too old..."

did you say the low freq is set all the way up? 250htz? try all the way down between 50-80.

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I'll ask again. Does this happen at low volumes?

Also, how many watts _RMS_ is the amplifier per channel? How do you have it wired? Stop quoting max wattage - it means nothing.

My guess is that your amplifier is clipping and you're getting some funky mechanical noise from your woofers instead of bass as it reaches xlim rather than the low notes.

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New Project: 2003 Pathfinder