[nikongod]

One more because nobody has replied within the last 30 seconds.

 

[nikongod]

I think the chips on there now are part of a gainclone(ish) circuit. 

 

[TheLaw]

My end budget...That's kind of the reasoning behind what I'm trying to do. I have an amp board. I have the transformer and wiring harness and satellite speakers. I don't see a purpose of trashing these parts or reusing them on something else...as that would render everything else remaining in the 2.1 setup useless. 
 
I'd really like to keep it sub $50 which is why I'm trying to base it off something I already have.
 
I bought a new subwoofer as well. It's a HiVi (Swan) M4N. It's an 8Ohm speaker whilst the sub that it is replacing was a 4Ohm speaker. The datasheet for the TFA9842J says that it can do only 7.5W on a 4ohm speaker and 15W on an 8ohm speaker. Hopefully that will work out and there won't be any power issues.
 
It cost me $20 shipped. So with the $20 I spent on replacement parts and $20 on the woofer, I have about $10 left in the budget to go towards building a new sub box. I think I have MDF in the garage, but I might need to get some sealant or something.
 
Hopefully I'm not sounding too noobish. I guess trying to fix something that is already a piece of crap is sort of useless, but to my ears, the stock Logitech sub really didn't sound all that bad...
 
Well, everything should be in within about a week. I hope it works out well. There's really not much that could go wrong.

 

[nullstring]

It bewilders me how people can have budgets like $50 that aren't adjustable..
 
Must be all children?
 
IDK

 

[TheLaw]

If you have an adjustable budget, then you have no budget at all.

 

[TheLaw]

What would you recommend I add? I seriously don't know what else I could dump into it, without being outrageously stupid.

 

[TheLaw]

This is the sub I bought by the way. I'd say it's quite a good speaker for the price. http://www.youtube.com/watch?v=ROsEcXnHv_I&feature=related

 

[TheLaw]

Wow now I feel stupid as hell....I just bought an 8ohm speaker for a 4ohm amplifier. According to the datasheet, I thought it was an 8ohm but I was wrong....Shoot...

 

[nikongod]

these things happen

 

[nikongod]

what does the datasheet for the amplifire chips say?

 

[nikongod]

what makes a 4-ohm amplifire one? 

 

[nikongod]

is it the fact that its marginally stable into 4 ohms?

 

[nikongod]

generally yes.

 

[nikongod]

it cant hurt that the power output is moar

 

[nikongod]

this is important to an OEM with a shoestring budget.