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miniDSP Low cost, modular Digital Signal Processor (DSP) kits for the DIYer from miniDSP.

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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
Lutjanus is offline Lutjanus  Australia
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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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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
Studio Au is offline Studio Au  United Kingdom
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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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Old 8th February 2017, 12:28 AM   #16
mirekti is offline mirekti  United States
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Quote:
Originally Posted by CharlieLaub View Post

I cut off the connector, used a DVM to figure out + and - wires, and then connected it to the screw terminals (I am using a 2x4-in-a-box).
I just purchased 2x4, but have no PSU. Did you cut off the connector as it wasn't a match for miniDSP or..?
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Old 9th February 2017, 07:34 AM   #17
oon_the_kid is offline oon_the_kid  Malaysia
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I am using this. Doesn't cost too much but definitely a bit more

Accessory – iPower

I used it to power my minidsp OpenDRC DA-8

Nicely built, but to be honest, I haven't tried doing a A-B comparison with its original power supply...

Oon
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Old 9th February 2017, 05:01 PM   #18
TedF is offline TedF  United Kingdom
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The 2X4 works well with any stable supply from 5 to 24 volts..... I use a 22V switch-mode supply and it's perfect. However if you are thinking of trying out the 2X4HD unit, be VERY careful! I have to admit to being careless; I plugged my 22V supply into the 2X4HD....... instant smoke!
Ouch!!!
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Old 27th December 2017, 04:05 AM   #19
earachemyeye is offline earachemyeye  United States
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interesting comparo of 5v usb power supplies...

A dozen USB chargers in the lab: Apple is very good, but not quite the best
A dozen USB chargers in the lab: Apple is very good, but not quite the best

...for when you want something quick.
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Old 27th December 2017, 05:03 AM   #20
gpapag is offline gpapag  Greece
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How is everyone powering their MiniDSP?
Quote:
Originally Posted by boris81 View Post
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.
Hi all
Current drawn by 2x4 MiniDSP differs depending on the voltage of the external PSU (see attachment)
There is also an issue with noise generated by the internal buck converter, see here
My stack

Quote:
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.
For 2x4 MiniDSP gain structure, please see here (go to post #21 if you have updated to plug-ins issued Mar12, 2013 and later as you should)
Signal Level in miniDSP x-over

George
Attached Images
File Type: png 2x4miniDSP DC input.PNG (20.8 KB, 93 views)
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