Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Class D Switching Power Amplifiers and Power D/A conversion

500W of ICEpower for USD0, deal or not?
500W of ICEpower for USD0, deal or not?
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 21st August 2019, 06:12 PM   #11
menlobob is offline menlobob
diyAudio Member
 
Join Date: Jan 2017
Quote:
Originally Posted by mga2009 View Post
What kind of buffer you used? Do you have pictures?

I've read ICEpower modules requiere a buffer for FR usage, but it's not necessary for SW duty.

As soon as I receive it I will post picture of the innards, and impression of the SQ.
I built two amps. One uses a single 125asx2 in stereo mode. Connected the single ended inputs direct to the amp module with no buffers needed. The second is a dual mono with two 125s in BTL mode, which requires differential input into to the amp to drive the positive and negative side of the bridged output. For this I used a converter buffer from Ghent audio: ghentaudio --- RTX (unbalnced RCA to balanced XLR Converting) Module

Hereís a picture of the dual mono amp with the buffer modules. Since the amp you ordered supports bridged output, there must be a buffer or transformer to generate the differential input needed by the amp module. I may order a couple of these today. If they have 125asx2 module in them theyíre worth the price just for pulling the module out. Otherwise if the input stage sounds good then these are a real bargain.
Attached Images
File Type: jpg FFD4A712-26DE-478D-8620-A2544852104B.jpg (674.9 KB, 566 views)
  Reply With Quote
Old 21st August 2019, 08:33 PM   #12
Turbowatch2 is online now Turbowatch2  Germany
diyAudio Member
 
Join Date: Aug 2013
Location: Northern germany
The sound of ICE amps can suffer without a buffer, if the souce is not low impedance. If you have a preamp that drives them well, you do, off course, need no buffer. Some models may sound better if driven symetrically from a strong buffer, as the input stages are not build to be used single ended. So, this is a "maybe" situation. Some commercial amps with ICE modules use transformer inputs.
  Reply With Quote
Old 21st August 2019, 08:48 PM   #13
menlobob is offline menlobob
diyAudio Member
 
Join Date: Jan 2017
Quote:
Originally Posted by Turbowatch2 View Post
The sound of ICE amps can suffer without a buffer, if the souce is not low impedance. If you have a preamp that drives them well, you do, off course, need no buffer. Some models may sound better if driven symetrically from a strong buffer, as the input stages are not build to be used single ended. So, this is a "maybe" situation. Some commercial amps with ICE modules use transformer inputs.
My dsp drives them with no issue.
  Reply With Quote
Old 21st August 2019, 08:52 PM   #14
mga2009 is offline mga2009
diyAudio Member
 
Join Date: Nov 2015
Great info!

I am still learning about amps, so I still don't understand quite well things like buffer and

So, to drive this modules in BTL mode I do need a "unbalanced to balanced converter"? That means that with a "unbalanced to balanced" converter like the Ghent Audio RTX (or feeding them with a balanced signal) I can convert any stereo amp (meaning ICEPOWER 50asx2se) to a BTL one?


OK, If I feed the amp with a balanced low impedance signal, I don't need a buffer? I will feed my amps with a 3e Audio DSP, which provides single ended input and balanced output, is it enough?
ADAU1701-2In4Out | 3e Audio

Thanks in advance!
  Reply With Quote
Old 21st August 2019, 08:58 PM   #15
menlobob is offline menlobob
diyAudio Member
 
Join Date: Jan 2017
Quote:
Originally Posted by mga2009 View Post
Great info!

I am still learning about amps, so I still don't understand quite well things like buffer and

So, to drive this modules in BTL mode I do need a "unbalanced to balanced converter"? That means that with a "unbalanced to balanced" converter like the Ghent Audio RTX (or feeding them with a balanced signal) I can convert any stereo amp (meaning ICEPOWER 50asx2se) to a BTL one?


OK, If I feed the amp with a balanced low impedance signal, I don't need a buffer? I will feed my amps with a 3e Audio DSP, which provides single ended input and balanced output, is it enough?
ADAU1701-2In4Out | 3e Audio

Thanks in advance!
You have to have balanced input to the amp module for bridged mode. And you must wire the bridge mode selector pin and speaker outputs correctly.

Iíve been thinking of using that 3e Audio DSP as an amp frontend as well.
  Reply With Quote
Old 21st August 2019, 09:09 PM   #16
mga2009 is offline mga2009
diyAudio Member
 
Join Date: Nov 2015
Quote:
Originally Posted by menlobob View Post
You have to have balanced input to the amp module for bridged mode. And you must wire the bridge mode selector pin and speaker outputs correctly.

Iíve been thinking of using that 3e Audio DSP as an amp frontend as well.
Thanks for your reply!

The VOCOPRO Featheramp does have a bridge mode selector (obviously), but my 50ASX2SE does not... so I can't use it in bridge mode, correct?
  Reply With Quote
Old 21st August 2019, 09:11 PM   #17
menlobob is offline menlobob
diyAudio Member
 
Join Date: Jan 2017
Quote:
Originally Posted by mga2009 View Post
Thanks for your reply!

The VOCOPRO Featheramp does have a bridge mode selector (obviously), but my 50ASX2SE does not... so I can't use it in bridge mode, correct?
This is the biggest advantage to the 125 over the 50. The 50 is factory configured either stereo or BTL and you canít switch it after the fact (at least not easily/safely).
  Reply With Quote
Old 21st August 2019, 09:32 PM   #18
mga2009 is offline mga2009
diyAudio Member
 
Join Date: Nov 2015
Quote:
Originally Posted by menlobob View Post
This is the biggest advantage to the 125 over the 50. The 50 is factory configured either stereo or BTL and you canít switch it after the fact (at least not easily/safely).
Excellent. I will keep you posted then with the innards of the VOCOPRO Featheramp.

In the best of cases it has a nice ICEpower amp module with a nice pre-amp.
  Reply With Quote
Old 22nd August 2019, 12:51 AM   #19
hifiamps is offline hifiamps  United States
diyAudio Member
 
Join Date: Jan 2016
I would like to get two of these to run as monoblocks. Too bad the enclosure is too big, even after removing the 6U (19.0 x 10.4") rack size face plate. It looks like the box is still very large compared to the compact 160x80x32.6mm module. So I would just pull the modules, and save the cases for another project. More junk in the garage, oh well. Still seems like a pretty good deal.
  Reply With Quote
Old 22nd August 2019, 05:15 PM   #20
gsrchrisu is offline gsrchrisu  Canada
diyAudio Member
 
Join Date: Feb 2019
Still listed for 400 cdn. Super interested to see some internal pics. And still dont believe in the counterfeit conspiracy that some believe with the 125asx2.
  Reply With Quote

Reply


500W of ICEpower for USD0, deal or not?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
[FS] ICEpower 200ASC + ICEpower 200AC sipsik Swap Meet 25 3rd November 2017 01:37 AM
Power Supply for 500W+500W Amplifier Pittbull Power Supplies 24 28th October 2010 11:13 AM
Selfoscillating HalfBridge 500W+500W by IR. Interested? deflorator Class D 0 10th October 2004 03:30 PM


New To Site? Need Help?

All times are GMT. The time now is 02:53 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Copyright ©1999-2019 diyAudio
Wiki