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Old 8th April 2011, 08:37 AM   #711
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346km, so not possible to listen before buying...
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Old 8th April 2011, 11:07 PM   #712
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Default Sure boards

Hi, actually the Sure is made in China also. The advantage of getting them through PartsExpress would be that they are an excellent vendor and handle returns and exchanges quickly, honorably and efficiently. A great vendor to deal with.

Plus, their price on the Sure is unbeatable. They also sell the accompanying Meanwell 27V power supply for $48... your 4ch amp boards + power supply would cost about $100USD before shipping.

The Meanwell would also work well on the 41Hz amps and has been getting very good comments on diyaudio for the good sound quality.

Yes, power supplies make up a BIG part of the overall sound... I've been using 24V/20A SLA batteries with a marine charger, and more recently have been using a RedWine Audio BlackLightning LFP 25.6V supply, and THAT makes these amps sound incredibly good.


OK, about the frequency response: it's actually quite flat in the audio band (within less than 1/2 dB) and you can extend the bottom end by replacing the crappy input cap for a good quality 2 to 10uF paper in oil, or foil, or whatever good quality cap you choose.

Many people change the caps and obtain big differences in sound according to the type they use... I have a friend who has a multiple selection stereo selector switch with 6 (!!) different types of matched capacitors on each channel so he can pick the sound he likes best according to the music he is playing and his preference of the moment.... pretty wild!

BTW, I just looked at the 41Hz site, and it looks like they are now selling some of their boards pre-assembled (hooray! they heard the voice of popular demand!), and at reasonable prices. Have another look with them, they also have very good sonic reputation!

Judging by your responses, it would seem almost as if you are very suspicious and pre-disposed against class D. Keep an open mind!
While it's true that most of the older and some of the newer classD amps are not audiophile material, SOME of these, like the Sure, 41Hz, Helder... and especially the Virtue amps... are really incredibly good sounding regardless of price. And they probably will push your CSS drivers to unreasonably loud levels, if you so desire. IMO these Tripath amps also sound better than most any Hypex or ICEpower units. And when they are hot-rodded and modded with good quality caps and coils... well, it's amazing.

Now, when you factor in the low, low, low price of entry, and availability of inexpensive but good sounding power supplies, ease of use and so on, you have amps with simply remarkable value. I hope you will actually try some. Your ears and pocketbook may very well thank you for it.

Good luck.
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Old 8th April 2011, 11:18 PM   #713
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Default Power supplies

The Meanwell SP-320-27 supply you referenced is the 27V version of the 24v unit Parts Express is selling for $48USD

Sure 24 VDC 14.6A 350W Regulated Switching Power Supply

The extra 10% voltage will give you a little more power into 8 Ohms, only about 1.6 db extra headroom.

For $48USD vs $135....I would save the money and get the 24V unit, with these amps it's really the extra current capability that seems to make the most difference.

Enjoy!
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Old 10th April 2011, 04:40 AM   #714
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Talking Correction

The extra headroom from the 27v supply vs the 24V is only about 1dB
Hardly worth a 3x price increase!
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Old 10th April 2011, 11:17 AM   #715
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Guys, just a heads up - the 27v Meanwells are available on ebay for very reasonable money! I picked mine up for $34, just have to put up with long delivery times.
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Old 11th April 2011, 04:11 AM   #716
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Default 34 USD for the 27V unit?

That's a good price! How much is shipping?
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Old 11th April 2011, 08:00 AM   #717
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That included shipping!

350W 27V DC 13A Power Supply Regulated Switching New | eBay

I was mistaken however, it's not actually a meanwell, it's a B&J. Still, should do the job nicely.
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Old 15th April 2011, 02:05 AM   #718
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Well, I am finally starting to assemble cabinets Rullknufs, so maybe in a couple weeks I can let you know how a twin EL70 sounds. Given my experience with the mMarS I am hoping for great things.

I will start a new thread once I have some pictures and progress worth posting. Expect that to take far longer than necessary though.
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Old 15th April 2011, 07:23 AM   #719
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Quote:
Originally Posted by Lerg View Post
Well, I am finally starting to assemble cabinets Rullknufs, so maybe in a couple weeks I can let you know how a twin EL70 sounds. Given my experience with the mMarS I am hoping for great things.

I will start a new thread once I have some pictures and progress worth posting. Expect that to take far longer than necessary though.
Oh, interesting!
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Old 28th April 2011, 08:58 AM   #720
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Just discovered Alison Krauss
Downloaded 2GB of FLAC yesterday, sounds fabulous on both headphones and speakers.

I also got the Sister Drum album, pretty amazing as well...
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