Mic preamp of MPA-102 vs U-Phoria UM2/UMC22? - diyAudio
Go Back   Home > Forums > Design & Build > Equipment & Tools

Equipment & Tools From test equipment to hand tools

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 17th April 2014, 09:20 AM   #1
diyAudio Member
 
Join Date: Aug 2007
Default Mic preamp of MPA-102 vs U-Phoria UM2/UMC22?

Hi all,

I need to buy a new low noise mic preamp that has phantom power and no corrections of any kind. I`ve strecthed the choice to two devices:
1. Behringer UMC22/UM2
2. Stage line MPA-102

The second was suggested by the calibration lab I used for my mic, the Behringers seem good on specs. What pros/cons i have so far:

1. The UMC22/UM2 are USB powered which saves the need for an extra socket. I may need to use them for mobile sound measurements and this would be a plus. I believe they use a DC-DC transformer to boost up the volatge to 48V for the phantom supply. Still, not a deal braker.
2. The bigger question between the two is the stated Midas preamp design on the UMC22. I know that Behringer bought Midas and all of the Midas people that were responsible for their high quality designs have left. The previously used TL071 has been replaced by Behringer with the 4556 which I consider relatively poor, compared to modern opamps. The Midas name on the preamp looks like a marketing blurb to me to get some extra surplus. However, the case of the UMC22 looks bigger which may indicate a higher quality power supply. Any comments on this?
3. How would the Monacor compare to the two Behringers in terms of noise? I`m ok with its lack of USB support as I do have an external sound card to use for this purpose.

Has anyone tried to modify those by using lower distortion parts, such as the AD8656 or the LM4562 ( no schematics was available, but I believe max possible voltage should be around 5V so the AD8656 might actually fit better )?

If anyone has the schematic of any of the units above, I would appreciate if you could send it to me.

Thanks,
Mario

Last edited by Mario Pankov; 17th April 2014 at 09:22 AM.
  Reply With Quote
Old 23rd April 2014, 10:24 AM   #2
diyAudio Member
 
Join Date: Aug 2007
No replies, went for the Monacor MPA-102...Has good reviews, let`s hope its better than the Behringer product.
  Reply With Quote
Old 7th May 2014, 01:39 PM   #3
diyAudio Member
 
Join Date: Aug 2007
Received the Monacor today so decided to write a few lines for future buyers. It is very well built, solid with metal casing. The gain pot is actually a stepped attenuator, using what looks to me like Vishay metal film 0.5W resistors. Inside there is a big aluminium cover that might act as a heatsink. Chips are underneath and as shown on the top cover schematic - they are three. All are NJM4558. All electrolytics are of low grade, brand was totally new to me. The unit looks like a good upgrade bench, in mid June I`ll have more time and would reopen it and try to plot the mic preamp schematic, perhaps some upgrades and a substitute of the 4558 to a ultra-low noise amp like the LM4562 might be possible.
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Behringer U-PHORIA series DACs btntx PC Based 1 5th December 2013 04:09 PM
How to make mic input transformer 150:50KCT for mic tube preamp??? delipasha Tubes / Valves 9 3rd February 2012 05:54 AM
FS: DIY S&B TX-102 based preamp randytsuch Swap Meet 3 14th December 2011 08:42 PM
'Tube' preamp bad for measurement mic? also Apex mic question morbo Multi-Way 10 23rd March 2005 10:19 AM
What mic preamp for Behringer testing mic The Paulinator Multi-Way 1 6th April 2003 07:02 PM


New To Site? Need Help?

All times are GMT. The time now is 06:31 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2