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Bad sub design? How to improve?

post #1 of 34
Thread Starter 
I was looking at my sub that came as a part of a $40 surround kit from newegg and wondering exactly where the 60watt RMS sub speaker was. Since I didn't see it on the outside (bad design?) I decided to crack the biggest box open. Well there it was... all sealed up inside a two room box. The area behind the cone is completely sealed... and the area in front is a ported chamber. Shouldn't the speaker be on the outside with the back of it in a ported chamber? I took a few pictures so you can see what I'm talking about. I'm thinking of knocking out that middle wall to make it one large chamber and putting the speaker on the side. That's the way all the other subs I've seen are done. Is this a good idea and could it help get the most out of this weak sub (which at the moment makes next to no bass, just some wooshing noises), or should I just leave it as is? The only requirement is I have to use this box because all the volume and surround adjustments are on a front panel of the sub (bad design again).

And one separate question: why does the sub cone have four wires going to it? There's a red and black pair on each side.
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post #2 of 34
well you could always pop the speaker and cables out, create a box that better suits the sub, looks like a 5 or 10 inch...thats all i can think of.
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post #3 of 34
Your sub shouldn't be sealed. It needs a hole somewhere to let out air pressure otherwise bad things happen. yeah it should be on outside with back in chamber with a port of someform.

If you want a challenge build a chamber your self.
post #4 of 34
Thread Starter 
Quote:
Originally Posted by metalkobra
well you could always pop the speaker and cables out, create a box that better suits the sub, looks like a 5 or 10 inch...thats all i can think of.
Well all the volume and surround adjustments are on a front panel of the sub (bad design again) so I have to stick with this box. Also it's a 5 inch... nothing compared to my 12 but I just want it for some higher bass.
Quote:
Originally Posted by Cuthy
Your sub shouldn't be sealed. It needs a hole somewhere to let out air pressure otherwise bad things happen. yeah it should be on outside with back in chamber with a port of someform.

If you want a challenge build a chamber your self.
Yeah that's what I was thinking. For the back of the cone there is nowhere for the air pressure to go so it's pretty handicapped I think.
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post #5 of 34
Your sub enclosure is called Band pass. One side of the case is sealed. and the other is ported. It allows for more bass at lower frequencies but at a smaller frequeny range. It is perfectly normal sub box
    
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post #6 of 34
Thread Starter 
Quote:
Originally Posted by SpookedJunglist
Your sub enclosure is called Band pass. One side of the case is sealed. and the other is ported. It allows for more bass at lower frequencies but at a smaller frequeny range. It is perfectly normal sub box
Oh... so this is a normal design? Would I be better off leaving it as is then? I was noticing it sounds darn good at 45 Hz but much lower or higher and it starts to fade away.
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post #7 of 34
Yes it is completely normal. If you are not familiar with box design I suggest that you leave it alone. There are benifits to to different bass enclosures.
I will try to break them down for you with as few words as possible

Sealed boxes:
produce nice tight bass across a broad frequency range. These are the best sounding boxes in my oppinion.They have the flattest frequency response. They require slightly more power from the amp though.

Ported boxes:
Usually larger than a typical sealed box . they will be usually louder than a ported box. the frequenxy range is still good. but not very flat frequency response causing there to be very peaky notes. thos notes are usually adjusted via port length.

Isobaric:
Basically two speakers face to face but off phase. usually installed in a sealed box. requires two subs so ill skip the details.

Band pass:
Read above post.

Any questions?
    
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post #8 of 34
Thread Starter 
Quote:
Originally Posted by SpookedJunglist
Yes it is completely normal. If you are not familiar with box design I suggest that you leave it alone. There are benifits to to different bass enclosures.
I will try to break them down for you with as few words as possible

Sealed boxes:
produce nice tight bass across a broad frequency range. These are the best sounding boxes in my oppinion.They have the flattest frequency response. They require slightly more power from the amp though.

Ported boxes:
Usually larger than a typical sealed box . they will be usually louder than a ported box. the frequenxy range is still good. but not very flat frequency response causing there to be very peaky notes. thos notes are usually adjusted via port length.

Isobaric:
Basically two speakers face to face but off phase. usually installed in a sealed box. requires two subs so ill skip the details.

Band pass:
Read above post.

Any questions?
yes... how is a ported box usually louder than a ported box?
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post #9 of 34
it was a typo, they are louder than a sealed box... your box is a bandpass type box,the loudest of all desighns, but also, the most distortion producing, i have the same type sub as you with my theater system and i was thinking the same as you, but i instead left the box the way it was, excepy put the port of your sub directly onto a much larger box, that itself had a port in it, i lost some spl, but i gained exponential amounts of low end frequency response! which is what i like... so it comes down to what music/sound your playing through the sub and what u prefer as to what kind of box u need...
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post #10 of 34
bandpass are realy only used in car audio where the tunning freqency (most likely around 45hz in this case) is used to complement the gain in the car. usually 120?.

in a large room that doesn't apply so bandpass is rarely used because it offers such a small frequency response.

what i would do is keep the front cover off and lift the sub onto the desk. behind the monitor (if possible) and see if thats what you like.

you'll probably get worst low booming bass but that'll be made up in tight controled and probably more accurate bass in a larger frequency range.

its really up to personal opinion though. see what you like.
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