or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › New 2ch plate amp: miniDSP with Icepower 125ASX2
New Posts  All Forums:Forum Nav:

New 2ch plate amp: miniDSP with Icepower 125ASX2

post #1 of 26
Thread Starter 
http://www.minidsp.com/products/plate-amplifiers/pwr-ice125

Just received an email this morning that miniDSP has a new plate amp. Looks like a 2-channel (can't see any analog outputs) miniDSP + Icepower 125ASX2 amp module (used in Peachtree Decco, etc.). Same DSP as the miniDSP 2x8/8x8.

It's a little pricier than the slightly less powerful equivalent plate amp from Hypex after shipping and duty/brokerage fees (I understand they're now shipping to the US by one of the private couriers, so fees are higher than when miniDSP shipped via USPS - USPS didn't ask me for any duty or brokerage fees on my 8x8 or 2x4s) but the miniDSP software is by now a known commodity, and I'm not sure the Hypex has Mac software for their onboard DSP. Still, an interesting little thing, and plenty of power for most mains.
post #2 of 26
That looks sweet. I may have to pick up a few of these sometime next month. I wish they would come out with a 3-channel plate amp + dsp options, though. I think the price is pretty reasonable. How much do those Hypex amps go for?
post #3 of 26
Nice! Could be a cool way of doing a compact active 2-way monitor. Price isn't too bad, imho but I'd like just a bit more power. Looked at the datasheet and there is no mention of power output @ 8ohms which would be more typical.
post #4 of 26
65 at 8ohms its on page 8 of datasheet
post #5 of 26
Gah! What the heck! I looked. tongue.gif

Well then... good to know. Wish the 4ohm rating was it's 8ohm rating.
post #6 of 26
Thread Starter 
Quote:
Originally Posted by Martycool007 View Post

***I think the price is pretty reasonable. How much do those Hypex amps go for?

Under $300 shipped from Meniscus or Madisound. (Link above is to Meniscus.) Hypex also has a more powerful one for $364 + shipping at Madisound.

Note that the cheaper Hypex is the only one of the three with a line-level subwoofer output.
Quote:
Originally Posted by Scott Simonian View Post

Nice! Could be a cool way of doing a compact active 2-way monitor. Price isn't too bad, imho but I'd like just a bit more power. Looked at the datasheet and there is no mention of power output @ 8ohms which would be more typical.

Stereophile tested a $3000 stereo receiver that uses the Icepower 125ASX2. They eked out 70W/4Ω and 120W/8Ω. (Note that the PS is built onto the amp module.) It also performed pretty impressively for a Class D amp in their simulated speaker load, with basically inaudible interaction between the source impedance and the driven load:

post #7 of 26
From the datasheet of the 125ASX2 - bridged output for subwoofer use;

Output power @ 1%THD+N 20Hz < f < 20kHz - 450 W (4 Ohms @ 230V AC)
Output power @ 1%THD+N 20Hz < f < 20kHz - 370 W (4 Ohms @ 115V AC)

I am thinking about this plate amp for Stereo Integrity HT 18" D2 (wired for 4 Ohms) use... Do you think it would be underpowered? Tiny apartment so not really a high SPL environment.
post #8 of 26
I wonder how the easy, or hard the Dsp/EQ/Crossover software is to set up for a novice? Is this amp capable of importing measurements from the likes of REW? Is the mic from MiniDsp compatible with this amp, or does it come with its own mic?
post #9 of 26
John Reekie intends to use this plate amp for his latest project on HiFi Zine. Thought you fellas might be interested in his proposal.

http://johnr.hifizine.com/2013/07/hifizine-active-two-way-speaker-proposal/
post #10 of 26
Interesting. I ordered a DBX2496 yesterday, may have to cancel that order and pick up some of these amps!
post #11 of 26
Hi folks, I guess I'm new here smile.gif Thanks GIEGAR for the link to my proposal cool.gif

Martycool007, some answers to your questions:
Quote:
Originally Posted by Martycool007 View Post

I wonder how the easy, or hard the Dsp/EQ/Crossover software is to set up for a novice?

It's the same type of setup as in the other (IIR based eg 2x4, 2x8) miniDSP units. The connection is via Ethernet not USB so you do need a wired network handy.
Quote:
Is this amp capable of importing measurements from the likes of REW?

It can import a set of parametric filters generated by REW's auto-EQ function. This works on the input EQ and both output EQs.

It doesn't import measurements directly.
Quote:
Is the mic from MiniDsp compatible with this amp, or does it come with its own mic?

The amp doesn't have any measurement capability built in. As long as you can measure with REW (or any other measurement program), that's what you'd use.

Hope that helps smile.gif
post #12 of 26
Quote:
Originally Posted by DS-21 View Post

It's a little pricier than the slightly less powerful equivalent plate amp from Hypex ... I'm not sure the Hypex has Mac software for their onboard DSP.

The Hypex amps look pretty cool too! I wasn't aware of those. The Hypex webshop has a slightly pricier version with digital in/pass. FYI the miniDSP software for the plate amp is Windows only (currently).
post #13 of 26
Thread Starter 
Quote:
Originally Posted by HifiZine View Post

FYI the miniDSP software for the plate amp is Windows only (currently).

Wonder why the massive step backwards? Hopefully that "currently" doesn't last for long.
post #14 of 26
Quote:
Originally Posted by DS-21 View Post

Wonder why the massive step backwards? Hopefully that "currently" doesn't last for long.

I believe it's because of the Ethernet/AVB connectivity (instead of USB). miniDSP mentioned this in their forum, I got the impression that a Mac port is on the cards.
post #15 of 26
Hifizine, do you know of any possible plan on a 3-channel plate amp with dsp? What do you guys prefer for us users to measure with? REW? Or what is the best way to measure, speaking in terms of both hardware and software? I currently have a Behringer ECM-8000 mic that I need to send to CSL to have calibrated. I also need to find a new sound card as the computer that I will be using is an older laptop. I might also need to pick up a mic pre-amp to power the mic. Any suggestions?
post #16 of 26
Quote:
Originally Posted by Martycool007 View Post

Hifizine, do you know of any possible plan on a 3-channel plate amp with dsp?

Hi again, it doesn't seem like a near term thing, here's the miniDSP response: http://www.minidsp.com/forum/pwr-ice-support/9274-new-plate-amplifier-new-forum-section?start=6#9683
Quote:
What do you guys prefer for us users to measure with? REW? Or what is the best way to measure, speaking in terms of both hardware and software? I currently have a Behringer ECM-8000 mic that I need to send to CSL to have calibrated. I also need to find a new sound card as the computer that I will be using is an older laptop. I might also need to pick up a mic pre-amp to power the mic. Any suggestions?

Well, REW is free and has a lot of features, I think it's worth learning to use although it has its quirks. Wrt the soundcard there's stacks of choices but here's one that I think is a good option: http://www.hifizine.com/2012/12/focusrite-scarlett-2i2/
post #17 of 26
Quote:
Originally Posted by Martycool007 View Post

Hifizine, do you know of any possible plan on a 3-channel plate amp with dsp? What do you guys prefer for us users to measure with? REW? Or what is the best way to measure, speaking in terms of both hardware and software? I currently have a Behringer ECM-8000 mic that I need to send to CSL to have calibrated. I also need to find a new sound card as the computer that I will be using is an older laptop. I might also need to pick up a mic pre-amp to power the mic. Any suggestions?
An Omnimic would be a much better investment.
post #18 of 26
Actually, I would rather have an all-in-one setup like the Omni-Mic but unfortunately I can not swing $300 for it at this time. I already have an ECM-8000 and can pick up a Xenyx 502 locally for $40, so all I would need then is a sound card and figure out how to calibrate my ECM-8000 mic.

Hifizine- I read that entire thread that you linked. Can you verify that particular sound card would not need a mic-preamp? It appears to already have phantom power built in, so it would be a plug & play with my ECM-8000 and HP desktop (Windows-7) computer? How much does the Scarlett 212 go for?
post #19 of 26
Hi Marty, the 2i2 has the mic preamp (well, 2 actually) built in, no external preamp is needed. I can't vouch for your specific computer but I don't see any reason why it wouldn't work. Assuming you are in the US it seems to sell for around $150.
post #20 of 26
Well then I might have to pick up one of these as I would much rather have an all in one sound card/mic-preamp. Can you tell me how to go about getting my Behringer ECM-8000 calibrated? Should I send it to Cross Spectrum Labs for calibration?
post #21 of 26
By time you have the mic calibrated, purchase a sound card, you're up in Omnimic territory, but will still be using inferior software. You're not paying $300 for just a mic, the software included is excellent.
post #22 of 26
I already have a mic, the ECM-8000, and I can get a Behringer Xenyx for less than $40 so that would leave only the sound card and mic-calibration. I would prefer to use the Omni-Mic, but right now I can't afford it.
post #23 of 26
Hi Marty, do you have line in and line out connections on your computer? If so, the Xenyx may be all that you need. If so, you can get started with the mic you have as it is and get it calibrated a bit later on. Although to be honest I am not very much a fan of that approach having tried to help a couple of people with it (noisy/flaky in-computer soundcards) but it may work fine for you.

Another option would be the calibrated UMIK from CSL. That may end up cheaper in the long run. USB mics have some limitations but work fine for the main task of frequency response measurements. The key thing IMO is a proper calibration as without that everything else is a bit pointless.

I'm not able to comment on the Omnimic as I have no experience with it.

Back on the topic of the miniDSP plate amp smile.gif If anyone is interested I have written a second proposal for a smaller speaker, any comments would of course be appreciated:

http://johnr.hifizine.com/2013/08/hifizine-mini-convertible-active-speaker-proposal/
post #24 of 26
Great driver selection for a mid-range, portable, two way. While the replaceable base is a novel idea, I woudn't waste time porting that build. Any time I've run a small driver below 65Hz, I lose midrange definition, and imaging.It's not noticeable at first, but once you free the driver up to handle midbass duties only, everything improves.

This amp looks fantastic though. I'm between a Hypex and minidsp right now for my pair of sealed TC Sounds Epic 12s .I use a dbx 260 for processing, so a plate with minimal controls is actually preferred.
post #25 of 26
Thank you Xyrium, for your comments. I'd agree that porting a small driver is a compromise.
post #26 of 26
Hi, for those interested, the first article using the plate amp being discussed here is up:

http://www.hifizine.com/2013/09/the-mini-convertible-active-loudspeaker-design/
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › New 2ch plate amp: miniDSP with Icepower 125ASX2