Hi, I have 2 pioneers 10″? TS-W257D4, and an alpine amp MRP-F200. I hooked it up to the stock 1998 maxima head unit so I used a LOC from BestBuy. At low volumes they sound okay, but when I turn them up just little more they have a thumping noise and they sound like they can’t handle the power. :confused: Amp is not even half way up. They don’t sound like they’re blown. Another detail; subs are not mounted in a wooden box but in the back of the cars where the stock speakers are on the rear dash I cut out bigger holes and fitted them there. Could this be because it goes through a (LOC) to a stock HU or maybe because the aren’t in a enclosure? I appreciate you taking your time to read this

Why did you do that? You only need one sub. It needs to be in an enclosure designed for the sub. The amp must have a Low pass filter in it, so the high frequencies aren't seen by the sub. What you have is a piece of cardboard that rattles.

I'd actually look into a boxed enclosure with a class D amp that includes a low pass filter.

To do it right, you need an an active crossover. 2 or 3-way and a minimum of 1 stereo and one mono amplifier (I recommend class D for the mono amp).

If you wan't low bass, pay attention to the specs of the system.

I think you have a very expensive rattle.

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Originally Posted by KeepItSimpleStupid

Why did you do that? You only need one sub. It needs to be in an enclosure designed for the sub. The amp must have a Low pass filter in it, so the high frequencies aren't seen by the sub. What you have is a piece of cardboard that rattles.

I'd actually look into a boxed enclosure with a class D amp that includes a low pass filter.

To do it right, you need an an active crossover. 2 or 3-way and a minimum of 1 stereo and one mono amplifier (I reccommend class D for the mono amp).

If you wan't low bass, pay attention to the specs of the system.

I think you have a very expensive rattle.

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Thnks a lot for you reply. Just wanted to say that I do have an amp with low pass swich and it's hooked up right.

The lack of an enclosure is the major problem. You could be distorting because the gain is too high as well or the amp is underpowered. Your not going to get the proper bass response without a proper enclosure. Two sub's allows it to be louder with less power per channel.

It is mounted in the deck and that could act as an "enclosure of sorts" if it's rather tight.

Take a look at this: Choosing the Right Subwoofer Box - Polk Audio

And

Loudspeaker enclosure - Wikipedia, the free encyclopedia

Quote:

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Originally Posted by KeepItSimpleStupid

The lack of an enclosure is the major problem. You could be distorting because the gain is too high as well or the amp is underpowered. Your not going to get the proper bass response without a proper enclosure. Two sub's allows it to be louder with less power per channel.

It is mounted in the deck and that could act as an "enclosure of sorts" if it's rather tight.

Take a look at this: Choosing the Right Subwoofer Box - Polk Audio

and

Loudspeaker enclosure - Wikipedia, the free encyclopedia

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The last thing that you said "It is mounted in the deck and that could act as an "enclosure of sorts" if it's rather tight."... what exactly do you mean?

It's not the same as having just a 10" speaker in the middle of the living room. In that case the enclosure has infinate volume.

When speakers are mounted in a deck, the volume of the truck is like the volume of a speaker enclosure, only bigger. But it has holes and rattles and is not tight. You might have gotten unlucky and the trunk causes the speaker to resonate. That sound woul dbe unpleasant.