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Old 9th October 2012, 02:47 AM   #11
boris81 is offline boris81  United States
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Default it sounds great on a 9V battery!

Quote:
Originally Posted by Davey View Post
You could be....depending upon where your volume control is. The ODAC outputs approximately 2V RMS for 0dbFS recorded material. You'd need to attenuate its output by a minimum of 7.0db to assure no possibility of overdriving the miniDSP inputs.

There's also programming to consider. Any EQ boosts above 0db in combination with input voltages near 0.9 VRMS will cause the unit to clip also.

For those interested in evaluating noise of the miniDSP, I suggest to run it temporarily on a 12 volt battery. This will give you a feel for the output noise it will exhibit with a good quality power supply.

Cheers,

Dave.
Wow, you guys are good! I spent an entire day swapping each and every power supply in the house until I finally figured out that I can try a battery.

Dave, I swear, I thought about hooking up a battery a minute before I looked at your post. Lol. I rigged up a 9V battery and that solved the bass distortion beautifully. I am happy to say that it sounds great with the battery. I hope the linear power supply delivers a similar performance.

It turns out that I was in fact overdriving the miniDSP input with the ODAC! I got around that by lowering the software volume in Windows.

I knew about overdriving it digitally because I have some experience with DSP. I usually lower the input level by the amount of the largest EQ peak and a few dB padding. This one is easy to verify audibly.


Quote:
Originally Posted by theAnonymous1 View Post
I thought the new version can take a 2Vrms input?
Yes, it has a jumper for selecting a 0.9V or 2V input. I am afraid the 2V might mess up the gain stage by lowering the signal too much.

Thank you all for helping me!
Picture.jpg
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Old 9th October 2012, 03:09 PM   #12
Davey is offline Davey  United States
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Using the jumper to select 2.0 volt input is perfectly acceptable. You'll lose 7db in your system gain, but that's beneficial in most cases.
With some source material (recorded at lower levels) you might find it's necessary to turn your volume control to maximum but still not achieve the playback level you want.
That might not happen....it depends upon power amplifier gain, speaker sensitivity, etc, etc.

I don't think you need to use anything fancy for a miniDSP power supply. I use an unregulated 12VDC wallwart when I use my setup.

Cheers,

Dave.
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Old 10th October 2012, 12:12 AM   #13
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Some great replies in this thread. Thanks everyone for their input.

Solar panel and 9V battery work?
Thinking something along the lines of readily available electronic kits available at Jaycar.
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Old 23rd October 2012, 03:45 PM   #14
boris81 is offline boris81  United States
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Location: white plains, ny
Thank you everyone for the help!
I just want to post a quick update. I've been running about a week with the linear power supply recommended in post #2 and everything is well. Based on my experiences I would not recommend powering miniDSP from the computer USB port or a generic switching power supply (low noise ones might be OK).

I'm currently running it with the 2V input option because the ODAC was indeed overdriving it at .9V.
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Old 19th January 2013, 11:56 AM   #15
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Can anyone recommend a power supply unit, available to the uk:

Maplin, Rs components, eBay. Im a little confused by the figures and types.
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