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Class D Switching Power Amplifiers and Power D/A conversion

ICEpower 50asx2 modules
ICEpower 50asx2 modules
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Old 23rd October 2015, 02:41 AM   #61
netxing is offline netxing  China
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confused I am.
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Old 24th September 2016, 03:09 PM   #62
wdecho is offline wdecho  United States
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I have decided to give this board a try with some very efficient horns. I am undecided on whether I will need a buffer. The latest pdf file in a block diagram shows an input buffer. Page 21.

http://www.icepower.bang-olufsen.com...ower50asx2.pdf

Does anyone know whether the board has been updated with a buffer for the front end from experience with this board? I have a FW B1 buffer to use if needed but was just curious to see what others say. The buffer described in the topic is pretty easy to build as well.
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Old 24th September 2016, 04:08 PM   #63
pguerin is offline pguerin  France
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Quote:
Originally Posted by wdecho View Post
I have decided to give this board a try with some very efficient horns. I am undecided on whether I will need a buffer. The latest pdf file in a block diagram shows an input buffer. Page 21.

http://www.icepower.bang-olufsen.com...ower50asx2.pdf

Does anyone know whether the board has been updated with a buffer for the front end from experience with this board? I have a FW B1 buffer to use if needed but was just curious to see what others say. The buffer described in the topic is pretty easy to build as well.
Hi wdecho,

There is no input buffer on 50ASX2 boards, and the input impedance go as low as 6k at 20 kHz, cf :

www.diyaudio.com/forums/class-d/192789-i...ods.html#post2642203

(50ASX2 and 125ASX2 modules probably share the same input stage design.)

I use this module connected to a Najda DSP and the buffer is required, the high section was muddy without.

I've used this design for the input buffer :

theslowdiyer.wordpress.com/2013/09/02/pr...cepower-asx-modules/

This combo is sounding very good IMHO.

BR,

Pascal
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Old 24th September 2016, 04:25 PM   #64
wdecho is offline wdecho  United States
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Thanks Pascal.
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Old 24th September 2016, 05:02 PM   #65
wdecho is offline wdecho  United States
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Another question. Reading the info you provided Pascal, Stokessd said "the amp needs a low output impedance source to drive it." What is considered a low output impedance? I have a number of preamps but my go to one now is a BA3 preamp and from what I found the output impedance of it is around 300 ohms. Is this considered low enough? I know I will find out when I try and use it with this amp but I am just curious. I will add a buffer if necessary but I am a believer in less is better.
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Old 24th September 2016, 05:11 PM   #66
famousmockingbird is offline famousmockingbird  United States
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From the literature provided;

"The single ended input buffer has an anti-aliasingfiltering and a DC capacitor. The input impedance of the signal input section is minimum 8kΩ over the audio bandwidth, which is an acceptable loading condition for pre-amps, active crossover outputs etc."

300 ohm source impedance will be fine. The rule of thumb is usually 10x so anything under 800 ohms shouldn't be loaded down too badly.
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Old 24th September 2016, 07:33 PM   #67
wdecho is offline wdecho  United States
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Thanks.
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Old 25th September 2016, 04:12 PM   #68
pguerin is offline pguerin  France
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Quote:
I have decided to give this board a try with some very efficient horns.
Hi wdecho,

I would be interrested by reading your listening impressions
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Old 25th September 2016, 05:10 PM   #69
wdecho is offline wdecho  United States
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Quote:
Originally Posted by pguerin View Post
Hi wdecho,

I would be interrested by reading your listening impressions
I will post when I have built and listened to it for a few days. I think what all the talk of a buffer with this amp is what not to do, using just pots to adjust sound. A good pre or buffer is necessary or build the buffer described in the instructions of the board. I think what this board is designed for is in speaker placement or some other device such as television, etc. It should be plenty powerful enough for my 103db horns as a stand alone amplifier.
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Old 28th September 2016, 10:36 PM   #70
wdecho is offline wdecho  United States
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Quote:
Originally Posted by pguerin View Post
Hi wdecho,

I would be interrested by reading your listening impressions
It only took less than an hour to get this board working. My first impression is: It sounds way better than it should. I am going to wait a few days before saying anything more. I have learned it takes a few hours listening to a new amp and comparing it with some of my others before saying too much. The only other Class D I have played with is the TPA3116 and each time I have put it in my system I am at first impressed but then after about an hour of listening it begins to fatique me. This amp does not appear to do that.
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