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post #2671 of 2685 Old 12-19-2014, 02:30 PM
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Shouldn't that be 's' (shield) and '-' (negative) jumper-ed? As per

http://www.hometheatershack.com/foru...dsp-howto.html

Or has that changed?
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post #2672 of 2685 Old 12-19-2014, 02:38 PM
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Quote:
Originally Posted by dtsdig View Post
Maybe I didn't read back far enough. You are using the MiniDSP 2x4 balanced, correct? How are you connecting your AVR to the input(s) of the Mini? RCA to bare wires into the phoenix connectors of the Mini, but do you have the "S" and "+" terminals jumped with jumper wire? Same on the Phoenix output terminals on the Mini. How are you wired from those outputs to the XLR or 1/4" inputs of your amp?
ah, I see. I am using the unbalanced Version. See my post above where I just have ordered a balanced


Not quite sure how balanced signal are measured but I intend to find out.


If i recall correctly, a balanced signal has a positive "correction/signal" (above x axis) and a negative "correction/signal" (below axis).
Unbalanced should only have "correction/signal" above x axis.


It should be enough to measure between positive and ground or negative and ground.


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Last edited by Strike Ace; 12-19-2014 at 02:38 PM. Reason: spelling error
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post #2673 of 2685 Old 12-19-2014, 02:54 PM
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Quote:
Originally Posted by Strike Ace View Post
It should be enough to measure between positive and ground or negative and ground.

Somebody set me straigh if I'm wrong...
you measure across pins 2 & 3 (positive/negative)
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post #2674 of 2685 Old 12-19-2014, 03:55 PM
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Quote:
Originally Posted by wildoak View Post
Shouldn't that be 's' (shield) and '-' (negative) jumper-ed? As per

http://www.hometheatershack.com/foru...dsp-howto.html

Or has that changed?
Yes! I meant from "S" to "-". I don't know why I mixed it up twice.
Thanks!
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post #2675 of 2685 Old 12-22-2014, 11:43 AM
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Quote:
Originally Posted by Audionut11 View Post
The mini-dsp will work best with it's input/output levels at maximum. Since the Rev b. has 7.5 dB of insertion loss, you should probably have it configured in Rev a. This means 0.9v input/output.
Maybe you can speak to this, and help me clear it up in my mind. Is there an actual physical difference between RevA and RevB, or is it just the default jumper setting that it ships with? The following quote over at your link doesn't seem clear to me:

Quote:
It sounds like the Rev A would have been a better choice for you. The Rev B units have an "insertion loss" equivalent to about 7.5db (with no processing.) Plus, the high output impedance of your preamp creates a voltage divider with the 14.4k input resistance of the Rev B unit and you "lose" even more signal.

The Rev A units have an even lower input resistance so you would lose even more signal there. However, they don't have the -7.5db signal reduction, so your "net loss" would be less.
This sounds a lot to me like a hardware difference beyond a jumper setting, otherwise the author would have advised moving the jumper, no?

Can anyone clarify?
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post #2676 of 2685 Old 12-22-2014, 11:52 AM
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Originally Posted by HDgaming42 View Post
Can anyone clarify?
there used to be different hardware, now there is just one board. See http://www.minidsp.com/index.php?opt...ics&Itemid=234 for details.
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post #2677 of 2685 Old 12-22-2014, 01:08 PM
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Originally Posted by 3ll3d00d View Post
there used to be different hardware, now there is just one board. See http://www.minidsp.com/index.php?opt...ics&Itemid=234 for details.
Thanks. So is the insertion loss an issue in RevB? For instance, is there any advantage to dropping to RevA at 0.9V input, if you need to drop your AVR trim by a large amount?

Let's say your AVR outputs near 2.0V (I have yet to measure mine). Would it be better to drop the AVR trim to such a point as the AVR output is <0.9V (and switch to RevA) to avoid the 7.5dB insertion loss, or if you are forced to drop the AVR trim by, coincidentally 7.5dB to get below 0.9V have you essentially done the exact same thing as simply outputting at 2.0V (configured as RevB) and experiencing the loss within the miniDSP?

Is one method better than the other?



It would be great if @3ll3d00d and @Audionut11 were able to respond (and ideally hold the same opinion). Thanks!
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post #2678 of 2685 Old 12-22-2014, 01:31 PM
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I don't think it (or at least am not aware of a reason why it would) makes a difference as long as you have clean output of the required voltage.

Just ask them though, they are responsive on their forum. No need to rely on some random internet dudes
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post #2679 of 2685 Old 12-22-2014, 02:06 PM
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Quote:
Originally Posted by 3ll3d00d View Post
I don't think it (or at least am not aware of a reason why it would) makes a difference as long as you have clean output of the required voltage.

Just ask them though, they are responsive on their forum. No need to rely on some random internet dudes
LOL. Fair enough. I guess it's time to set up an account over there...
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post #2680 of 2685 Old 12-22-2014, 10:35 PM
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Quote:
Originally Posted by HDgaming42 View Post
Thanks. So is the insertion loss an issue in RevB? For instance, is there any advantage to dropping to RevA at 0.9V input, if you need to drop your AVR trim by a large amount?

...
If your sub has both left and right RCA inputs that sums together internally in the amp for a combined signal (i.e. left+right), you can get +6dB gain by having a Y-splitter out of the MiniDSP 2x4 and connect to your sub as left+right.

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post #2681 of 2685 Old Yesterday, 10:51 PM
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I heard that the minidsp 2x4 (unbalanced version) has bad noise floor. How about the 10x10 version?
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post #2682 of 2685 Old Today, 07:51 AM
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Originally Posted by Skylinestar View Post
I heard that the minidsp 2x4 (unbalanced version) has bad noise floor. How about the 10x10 version?
I am using the 2x4 unbalanced and I don't know of any noise floor issues. If you were to suggest how I could measure the device's noise floor, I would be glad to take the measurement.
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post #2683 of 2685 Old Today, 09:50 AM
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Originally Posted by AustinJerry View Post
I am using the 2x4 unbalanced and I don't know of any noise floor issues. If you were to suggest how I could measure the device's noise floor, I would be glad to take the measurement.
I'm not a pro in measurement. Sorry about that.
I've heard some people complaining about speaker hiss issue after adding the minidsp in the signal chain. Do you have yours in the subwoofer chain? It's the high frequency that matters.
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post #2684 of 2685 Old Today, 11:12 AM
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Originally Posted by Skylinestar View Post
I'm not a pro in measurement. Sorry about that.
I've heard some people complaining about speaker hiss issue after adding the minidsp in the signal chain. Do you have yours in the subwoofer chain? It's the high frequency that matters.
Mine is on the sub channel.
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post #2685 of 2685 Old Today, 11:48 AM
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Quote:
Originally Posted by Skylinestar View Post
I'm not a pro in measurement. Sorry about that.
I've heard some people complaining about speaker hiss issue after adding the minidsp in the signal chain. Do you have yours in the subwoofer chain? It's the high frequency that matters.
That's more user error (i.e. mis-optimized gain structure) than a problem with the part.

Note that Earl Geddes uses it with his new speakers, and they use a very efficient B&C compression driver.

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