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  #1  
Old 12-30-2009, 07:22 PM
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Amp help

Hey guys, I just bought a 400watt rms sub that's hooked up to a pioneer 5300t amp. I have it bridged to 380watts. I set the bass boost on the amp to 6 or half way up. Twice now after turning my jeep off briefly and then starting it back up I've got this constant "heart beat" coming from the sub. Like a sine wave, thump thump .... thump thump.... thump thump. I am guessing that it is probably the amp getting too hot, it did feel warm, but not smokin hot. Any ideas? I have the amp mounted inside the cargo tray area. Thanks!
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Old 12-30-2009, 07:30 PM
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Re: Amp help

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Originally Posted by mzh29 View Post
Hey guys, I just bought a 400watt rms sub that's hooked up to a pioneer 5300t amp. I have it bridged to 380watts. I set the bass boost on the amp to 6 or half way up. Twice now after turning my jeep off briefly and then starting it back up I've got this constant "heart beat" coming from the sub. Like a sine wave, thump thump .... thump thump.... thump thump. I am guessing that it is probably the amp getting too hot, it did feel warm, but not smokin hot. Any ideas? I have the amp mounted inside the cargo tray area. Thanks!
Where is the gain set?

Are you using a bass knob?

What kind of enclosure is the woofer in?

Is is a dual voice coil sub, or single? You're sure your sub is wired to 4 ohms, correct?


Non-pertaining advice: Turn the bass boost off. All that does is boost at a certain frequency (usually 40hz). It's not a volume knob or a gain knob.
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Old 12-30-2009, 07:54 PM
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Re: Amp help

I had the gain set to "normal". It's in a ported enclosure 1.7ft^3. As for the wiring I just hooked positive to positive and negative to negative.

I still have the stock cd player, I know an aftermarket head unit would make it sound alot better.
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Old 12-30-2009, 07:57 PM
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Re: Amp help

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Originally Posted by mzh29 View Post
I had the gain set to "normal". It's in a ported enclosure 1.7ft^3. As for the wiring I just hooked positive to positive and negative to negative.
Define "normal" or give a percentage...?

What's the enclosure tuned to?

What sub woofer?

Is the woofer a dual voice coil sub, or single?
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Old 12-30-2009, 08:09 PM
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Re: Amp help

It's a kfc-w3012 kenwood. I wanna say the gain is set to .4? On the kenwood website it says it has a "2 layer voice coil design", so I guess a single coil. The box is an hpr12g made by bassworx. I'm not sure what it's tuned to, can't find it anywhere.
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Old 12-30-2009, 08:16 PM
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Re: Amp help

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Originally Posted by mzh29 View Post
It's a kfc-w3012 kenwood. I wanna say the gain is set to .4? On the kenwood website it says it has a "2 layer voice coil design", so I guess a single coil. The box is an hpr12g made by bassworx. I'm not sure what it's tuned to, can't find it anywhere.
Ok, cool. It's a single 4 ohm woofer.

Now, you did bridge the connection on the amp, correct?

If so, then your wiring is good, you gain seems to be about right (minus the gain).

What are your crossover settings on the amp set at?

I'd dump the box (or return it if you can). Surely it's tuned very high (38-46hz), and there's not a lot of port volume or port area. Just a suggestion.
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Old 12-30-2009, 08:24 PM
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Re: Amp help

The amp just has an LPF switch on it, which I have turned on. I had a feeling that maybe I should stick with a sealed box, but I've never had a ported box and wanted to try it out. I'd like to avoid the hassle of returning the box. Do you think it would work if I sealed off the port with like a piece of plexiglass?
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Old 12-30-2009, 08:30 PM
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Re: Amp help

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The amp just has an LPF switch on it, which I have turned on.
Good. Leave that on. That will filter out the higher frequencies and only allow sub bass frequencies to be sent to the sub.

Quote:
Originally Posted by mzh29 View Post
I had a feeling that maybe I should stick with a sealed box, but I've never had a ported box and wanted to try it out. I'd like to avoid the hassle of returning the box. Do you think it would work if I sealed off the port with like a piece of plexiglass?
The thing with ported enclosures is that it is VERY VERY important that they are designed specifically for the woofer they are housing. This will make or break how it sounds... and given the general consensus about pre-fab vented enclosures, that one is probably awful.

Yes, you could seal the port, but plexi probably ain't gonna cut it.

I'd return it and get this;

http://www.sonicelectronix.com/item_...+-12SQTC-.html
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Old 12-30-2009, 08:50 PM
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Re: Amp help

Hmmm... I'll have to give it some thought. I think I might try sealing it off first and see if it makes a difference. It looks like it would be super easy with a wood block covered in black carpet. Then put the silver trim piece back on using longer screws to hold it in place. I mean it sounds pretty good. My main concern was the amp, I was listening to some pretty hard hitting songs with the volume cranked.

Just looked on their website, the box is tuned to 42hz for what it's worth.

On the kenwood site it says the sub has a free air resonance of 32hz, does that pertain to the type of ported box it should be in?
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Old 12-30-2009, 08:53 PM
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Re: Amp help

I know I've read on car audio forums that people have had this same problem, I just have never opened the threads - never had this problem. Maybe search around at caraudio.com or diymobileaudio.com
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Old 12-30-2009, 09:07 PM
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Re: Amp help

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I know I've read on car audio forums that people have had this same problem, I just have never opened the threads - never had this problem. Maybe search around at caraudio.com or diymobileaudio.com
Is there any way to lower the hz of the box?
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Old 12-30-2009, 09:10 PM
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Re: Amp help

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Is there any way to lower the hz of the box?
Not properly, no.
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