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Am I correct that all I need is the amp board and the power supply? So V2.0 (2*100W) board + Meanwell 27V SMPS. (~$100 shipped total)I have to do the wiring, add power switch, RCA jacks, ...
That sounds about right. Although I would wait a couple weeks as they are finalizing a dual mono block and PS design which will probably be very well-priced and would be a smarter choice amp-wise (depending on your speakers, anyway) than a single board. Very exciting time for diy audio!
How do you see the new dual mono amps comparing to the existing offerings? And would you mind elaborating on why and with what kind of system you would see these as a better choice?Thanks,Rod
My assessment is purely based on the watts provided (and I'm speaking specifically of the Hifimediy here, not the classdaudio). With the dual mono you will be able to provide more power and cleaner audio to your speakers, also I believe they are working on a pretty good design for the PS. As to the second half of your question that's pretty broad and I couldn't answer that without more info except to say that the TK2050 is effectively more like 2x70w, not 100w. 100w would be with high distortion. So depending on your speakers' efficiency 70w may or may not be enough for your needs. Here is part of the dual mono.http://www.diyaudio.com/forums/class-d/164274-new-tk2050-board-45.html
Looks like it's available now...http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=130420520248
That was fast. They are on a roll. 300 Watts! for $100. Accepts both DC and AC. Wow. That looks pretty dang cool. Somebody has to get one and report back!
Well the 300 Watt rating is into a 4 Ohm load, so 150 is a more realistic number...
I run 4 ohms...
Me too. They say on the ebay page that the PSU board can accept either a SMPS feeding DC or an AC source. Would there be any reason to use an SMPS other than to possibly save some energy as well as lower component cost from not having to buy a more expensive torroid? If AC is supplied, is the only component needed an AC transformer? They say the AC range is 22V-35V and DC is 30-50V. Are these amp boards not using a + and - power supply rail like the Class D Audio amps, and therefore only a single 35VAC secondary transformer would be required? Lastly, any idea what the storage capacitance of the PSU board is, and could a separate PSU board be used for each amp board? I would like to build a complete dual mono with 2 transformers and 2 PSU boards, even if it isn't necessary because of the low cost of component parts. Steve
Fair enough guys. I guess I'm used to commercial amp manufacturers usually giving power ratings into an 8 Ohm load, so when comparing, I like to try to keep things as equal as possible. When I read that an amp has 300 Watts/Channel I assume that is into an 8 Ohm load. Then I do some research and find out that spec is into 4 Ohms, and it's rating of 150 into 8 Ohms is a bit of a let-down to me.
I agree they should be rated at 8 ohms, like most all amplifiers traditionally have been rated. I think this 4 ohm rating for class D amplifiers started with Hypex UCD and B&O ICEPower, and now every other class D maker feels they have to also spec at 4 ohms so their products will be comparable and competitive. Never should have happened. Steve
most amps capable of 8 ohm load are not necessarily capable for 4 ohm load or the power would not have doubled, for example, 150 8 ohm perhaps 200 4 ohm instead of 300.
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