Subwoofers fades on low frequencies

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N34l

Member - Posts: 7

Joined: March 22, 2005

Location: South Africa

Posted: March 22, 2005 at 7:40 AM / IP Logged

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

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

ss-installer

Silver - Posts: 444

Joined: February 27, 2005

Location: United States

Posted: March 22, 2005 at 8:18 AM / IP Logged

what kind of HU are you running?

mrmsudawgs

Copper - Posts: 145

Joined: February 22, 2005

Location: United States

Posted: March 22, 2005 at 8:29 AM / IP Logged

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

N34l

Member - Posts: 7

Joined: March 22, 2005

Location: South Africa

Posted: March 22, 2005 at 8:33 AM / IP Logged

ss-installer wrote:

what kind of HU are you running?

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

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

ss-installer

Silver - Posts: 444

Joined: February 27, 2005

Location: United States

Posted: March 22, 2005 at 8:34 AM / IP Logged

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

haemphyst

Platinum - Posts: 5,054

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Joined: January 19, 2003

Location: Michigan, Bouvet Island

Posted: March 22, 2005 at 8:47 AM / IP Logged

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...

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."

N34l

Member - Posts: 7

Joined: March 22, 2005

Location: South Africa

Posted: March 22, 2005 at 8:50 AM / IP Logged

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

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

c3d

Copper - Posts: 45

Joined: February 05, 2005

Location: Canada

Posted: March 22, 2005 at 9:32 AM / IP Logged

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.

1987 Nissan 300ZX N/A

1994 Audi 90 Quattro CS

c3d

Copper - Posts: 45

Joined: February 05, 2005

Location: Canada

Posted: March 22, 2005 at 9:38 AM / IP Logged

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

1987 Nissan 300ZX N/A

1994 Audi 90 Quattro CS

N34l

Member - Posts: 7

Joined: March 22, 2005

Location: South Africa

Posted: March 23, 2005 at 12:17 AM / IP Logged

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.

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

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