Go Back   Home > Forums > > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

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

Reply
 
Thread Tools Search this Thread
Old 2nd July 2018, 05:55 PM   #1
e_fortier is offline e_fortier  Canada
diyAudio Member
 
e_fortier's Avatar
 
Join Date: May 2001
Location: Eastern Canada
Low output voltage
Default Low output voltage

Hi

Just bought a regular non HD unbalanced MiniDSP and via the 2x4 Advanced program it works great for my 2.1 set-up.

One question; Why is the output set to such a low maximum of 0.9v ?

When my DAC feed my amp directly the overall output through the speakers is noticeably louder. When the MiniDSP is inserted between the DAC and the Power amp it’s quite noticeable that the output is reduced.

Any possible diy mods to increase the output voltage ?

Thanks
Eric
  Reply With Quote
Old 3rd July 2018, 04:22 PM   #2
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
The standard unit is unity gain with the input jumpers in the the 0.9 volt position, so you shouldn't notice any reduction in level.

The 0.9VRMS maximum voltage is inherent in the ADAU1701 chip. To avoid extra cost, there are no additional voltage gain stages added. So, you're stuck with that limitation unless you add something externally. If you wanted more voltage, you should have selected the balanced version.

Dave.
  Reply With Quote
Old 3rd July 2018, 04:35 PM   #3
e_fortier is offline e_fortier  Canada
diyAudio Member
 
e_fortier's Avatar
 
Join Date: May 2001
Location: Eastern Canada
Low output voltage
You do notice a reduction in level, it’s only normal since my DAC output is greater than 0.9v so when the MiniDSP is inserted the output will be lowered. That’s easy to understand.

Thanks for the info, looks like a Preamp w a small voltage gain is required.

Kinda wonder why they did this, many people have this issue.

BR
Eric
  Reply With Quote
Old 3rd July 2018, 04:45 PM   #4
Davey is offline Davey  United States
diyAudio Member
 
Join Date: Dec 2001
Location: Bremerton, WA.
You didn't make clear in your first post your jumper setting and overall configuration, and thus my comment.
Where is your system volume control at?

I suggest to read Section 4 of the miniDSP 2x4 manual.....regards mode setting of the jumpers.
If connecting a DAC directly, the jumpers should probably be in the 2 volt position to avoid clipping of the ADC. In that case the configuration will yield a 7db insertion loss. If you system volume control is in your DAC, you can most likely use the 0.9 volt setting and not clip the DSP internals.

As I said, if you had a requirement for more voltage, you should have selected the balanced version. Operated with an unbalanced scheme, you would have had a 2-volt in....2-volt out configuration.

Dave.

Last edited by Davey; 3rd July 2018 at 04:48 PM.
  Reply With Quote
Old 4th July 2018, 02:05 AM   #5
e_fortier is offline e_fortier  Canada
diyAudio Member
 
e_fortier's Avatar
 
Join Date: May 2001
Location: Eastern Canada
Low output voltage
Thanks for your help Dave.
  Reply With Quote

Reply


Low output voltageHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
NC400 Voltage Output vs Supply Voltage DDF Class D 4 22nd October 2017 06:33 PM
convert voltage drop across resistor + output voltage into current into the output? realflow100 Everything Else 29 13th May 2017 06:28 PM
Bias voltage for Class A/B output and output transistor choices maggiesnmacs Solid State 20 6th May 2016 03:26 AM
Can An Output Transformer Change A Voltage Amp's Output Impedance From 0.1 To 47 Ohms kelticwizard Everything Else 11 25th March 2007 05:17 AM


New To Site? Need Help?

All times are GMT. The time now is 07:47 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki