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MiniDSP 4x10 HD Measurements
MiniDSP 4x10 HD Measurements
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Old 15th May 2016, 07:21 PM   #21
billshurv is offline billshurv  United Kingdom
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MiniDSP 4x10 HD Measurements
Quote:
Originally Posted by Omholt View Post
Nice test.


miniDSP seems to basically offer mediocre products and I'm not sure they will change that. Good value for the money but not great quality.
A connector you don't like doesn't make it mediocre. What else is wrong with them?
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Old 15th May 2016, 11:12 PM   #22
tomchr is offline tomchr  Canada
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Default MiniDSP 2x4 Measurements

As requested, the MiniDSP 2x4 measurements.

Please note that these measurements were intended as a quick look at the performance of the single-ended version of the 2x4 and not an in-depth characterization. Thus this set of measurements should not be considered complete, rather a quick glance at the performance. I also no longer have access to this 2x4, so I can't go back and take more measurements.

I may get my paws on a 2x4 differential version in the future and will post a full set of measurements of it if that materializes.

Tom
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MOD686: Up to 240W/8Ω, <0.00025% THD. MOD86: 40W/8Ω, 0.000054% THD. HP-1: 3W/20Ω, -130dBc THD, 128dB DNR.
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Last edited by tomchr; 15th May 2016 at 11:15 PM.
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Old 15th May 2016, 11:15 PM   #23
Salas is offline Salas  Greece
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MiniDSP 4x10 HD Measurements
Tom, thanx
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Old 16th May 2016, 03:26 AM   #24
twest820 is offline twest820
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Quote:
Originally Posted by tomchr View Post
The CMRR is less than stellar. That's to be expected from a discrete solution, though, it looks like the layout could use some tightening up to prevent the degradation above 1 kHz.
Does the board show a pair of lowpass caps on the inlet diff amp? If so, it's more likely their tolerance than layout symmetry.

The -54dB floor below 100Hz suggests 0.1% matching. If MiniDSP gets that by design rather than good luck coming off the reel IMO that'd be notable.
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Old 16th May 2016, 04:59 AM   #25
tomchr is offline tomchr  Canada
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They appear to be using LC (!) filters on the inputs. The CMRR at higher frequencies could be dominated by the tolerance of the inductors.

I don't know whether they use 0.1 % or 1 % tolerance resistors. -54 dB CMRR would imply 0.2 % matching.
In the old days, resistors were binned which meant you were more likely to get resistors that were closer to the tolerance limits than to the centre of the distribution. I don't know if that's still the case or if the manufacturers have improved the process enough that they can rely on spot testing or skip testing altogether.

Tom
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Old 16th May 2016, 05:43 AM   #26
twest820 is offline twest820
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That'd do it too. What dominates just depends on the LCR values and tolerances chosen; in a well designed circuit caps tend to be the limiting factor but it depends on cost headroom in the BOM and how much the designer optimized.

Since diff amp CMRR is a function of relative pair ratios in a resistor quad there's an extra factor of two. The terminology's not standardized and even in matched quad datasheets it's often unclear exactly what one's getting; I've seen both definitions here in use in the industry. Whether there's a 0.1% take out and its extent would depend on the manufacturers, R values selected, and how the fab lines are operated. In general I would tend to guess probably not so much due to differences in temperature ranges, TCRs, and thermal ratings. It's plausible for certain Susumu selections and straightforward within Yaego's RT series. 0.5% is increasingly popular and doesn't necessarily cost more than 1% so that's a possibility to consider as well.
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Old 16th May 2016, 06:01 AM   #27
Omholt is offline Omholt  Norway
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MiniDSP 4x10 HD Measurements
Quote:
Originally Posted by billshurv View Post
A connector you don't like doesn't make it mediocre. What else is wrong with them?
Noise and distortion. The in blox units also lack a display, which really should have been there when you have volume control.

Last edited by Omholt; 16th May 2016 at 06:03 AM.
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Old 16th May 2016, 02:57 PM   #28
Davey is offline Davey  United States
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Quote:
Originally Posted by Omholt View Post
Noise and distortion. The in blox units also lack a display, which really should have been there when you have volume control.
Well then, many thanks to Tom for posting some proper baseline noise and distortion performance measurements, and providing some thoughts on the trade-offs involved.

The lack of display is a feature-related issue and not a measurement-related issue.

If the noise and distortion performance of the 4x10Hd unit is not acceptable to you, then obviously you will move on and use something different?

Dave.
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Old 16th May 2016, 03:12 PM   #29
billshurv is offline billshurv  United Kingdom
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MiniDSP 4x10 HD Measurements
I'd like to see measurements for something that has significantly better noise and distortion. Clearly Omholt has some to hand and would be nice for him to share.

Personally I like the lack of a display. the behringer line, although very good once all the mods (and the didden volume control) are put in shouts 'stick me in a rack'. Personal opinion of course.
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Old 16th May 2016, 03:43 PM   #30
Omholt is offline Omholt  Norway
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MiniDSP 4x10 HD Measurements
Hypex DLCP has better hardware but the software hasn't been completed and is lacking some.

The miniDSP 4x10Hd is good value like mentioned but not a great product. miniDSP as a company seems to be aiming at the budget market and are successful at what they do. However, those who want a stellar product have to look somewhere else. At the moment the choices are few though but there are products and plans on the way.
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