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Old 9th February 2013, 08:51 PM   #11
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Quote:
Originally Posted by Jsixis View Post
I have 2 of the Ebay 12 dollar 2.1 amps using the TDA 2030 chips. I haven't hooked up any gear to it but from the 1 night of testing it does have low and high pass cutoffs.
Thats good to know, is the x/o fixed and at what frequency?
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Old 10th February 2013, 04:54 PM   #12
Jsixis is offline Jsixis  United States
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Quote:
Originally Posted by Bill poster View Post
Thats good to know, is the x/o fixed and at what frequency?
On this board it is fixed, right now I have no idea of where it is crossed over or how. Going by my ear I would say close to 100hz and possibly lower as I only heard the kick drum and some low bass guitar out of the sub.
I was just making sure the amp worked before I installed it in a box. I did learn 1 thing, a 4 ohm woofer on bridged TDA2030 will short quickly.
(have to replace those 2 chips today)
I'm hoping to get the amp in a proper box next weekend and then I'll hook my audio tools and see what is what.
The PCB is 2 layers I will try to get a picture of the 2 layers.
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Old 10th February 2013, 05:53 PM   #13
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I asked a seller of this type of board about the xo and they said it was 160hz.

Kyle
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Old 11th February 2013, 12:08 AM   #14
Jsixis is offline Jsixis  United States
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the seller I bought mine from had no clue. I was asking about the power supply, finally hooked up a 12.6-0-12.6 2amp radio shack.
I spent the day testing power transformers. Naturally I have all of the wrong kinds :^(

It may be 160hz, I burnt the low end chips up using a 4 ohm 15" sub, it was working fine till I decided to crank it all the way up, then the sub started motor boating and before I could turn it down the chips fried. Oh well lesson learned.
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Old 13th February 2013, 08:34 PM   #15
blossom is offline blossom  New Zealand
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This can be used as 2.1, no crossover though.
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But that’s sidetracking the topic. I also have searched for what the threads tittle desires, and in particular for a 12 volt solution. And as far as i understand, there is no 35 to 50watt class D/T from 12volt(capable of 4 ohm). I wish somebody could prove this wrong!!!!!

There is one thing though, but power is limited at 12v with out going to 2ohm. That is the TAA4100A chip. 41hz does a DIY board.
http://shop.41hz.com/shop/item.asp?catid=42&itemid=796

2.1 solutions are something I have always been interested in. And there is not a lot of options available when it come to all in one including crossover that are descent for cheap.

Last edited by blossom; 13th February 2013 at 08:43 PM. Reason: expand post
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Old 13th February 2013, 09:28 PM   #16
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One solution worth noting is the combination of a miniDSP and miniAMP. You can run them stacked configured as either 2x20w, 4x10w or 2x10w+1x20w. You also get a tremendous amount of power to configure crossovers and other DSP functions. The cost is far higher than all the Ebay amps being looked at in this thread BUT the results and flexibility will benefit immensely. If the 40w miniAMP is not sufficient a 4x100 TK2050 amp could be used instead. The sub could run off of just one of the channels.

KM
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Old 13th February 2013, 09:32 PM   #17
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This is interesting, I also looked at the Hypex modules too. If using the miniDSP, cd u use say, a 4x50w amp and bridge 2 channels?

edit - like this one Hifimediy T1X4, TK2050 4 channel STA508

Last edited by Bill poster; 13th February 2013 at 09:35 PM.
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Old 13th February 2013, 09:36 PM   #18
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The miniDSP by it's self can be piped into any kid of amp as far as I know. The ability to bridge the amp's channels into one is up to the design and chips capabilities.

KM

Last edited by KyleinCowichan; 13th February 2013 at 09:39 PM.
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Old 13th February 2013, 09:52 PM   #19
blossom is offline blossom  New Zealand
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One common issue I seem to come across when looking for 2.1 is that the '1' usually only wants 8ohm.
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Old 13th February 2013, 10:39 PM   #20
zman01 is offline zman01  Bangladesh
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The Hifimediy 2.1 solution suggested by Bill Poster has the sub @ 4 Ohms.

Hifimediy DDX320v2 2.1 Digital Amplifier
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