X250.5 question - diyAudio
Go Back   Home > Forums > Amplifiers > Pass Labs

Pass Labs This forum is dedicated to Pass Labs discussion.

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 19th May 2008, 03:05 AM   #1
diyAudio Member
 
Join Date: May 2006
Default X250.5 question

Hi,

I am running a Lynx Two B Sound Card directly into a Pass Labs X250.5. The Lynx is switchable between -10dBV and +4dBu outputs. Will running the +4 setting in any way overload the inputs on the Pass X250.5?

Thank you,
Alan
  Reply With Quote
Old 19th May 2008, 04:42 AM   #2
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
If you mean +4 dBv, this is shy of the power of the amplifier if you
run it at 26 dB. Later versions of the 250.5 are shipped with a 26 dB
default, jumperable to 30 dB. If you have an earlier one, the easiest
solution is to add some resistance in series with the input, say 5.6K
ohm on both + and - inputs, but I wouldn't do this unless you actually
experienced a problem, since the spec is the max, and likely you will
not see the figure.

-10 on the other hand, is probably not enough.
  Reply With Quote
Old 29th May 2008, 07:33 AM   #3
diyAudio Member
 
Join Date: May 2006
Default Thank you and one further question

Hello,

Thank you for answering my query. I read in the X250.5 user manual about the improved harmonic and RF filtering of the .5 amplifiers. Given this, is there any reason to run power condition or regeneration in front of the amplifier?

Thanks,
Alan
  Reply With Quote
Old 29th May 2008, 08:25 PM   #4
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Line filtering which doesn't limit the input draw is my preference,
which largely corresponds to the Richard Grey type filters,
parallel LC across the line, resonant at the line frequency.

Having said that, Wayne was running a PS Audio Power Plant
Premier with three amplifiers and liked the results. It did
ultimately break, although we don't know why.

I consider three of our amplifiers a bit excessive, though.
  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
Question on X250.5 and X350.5 lmcyee Pass Labs 7 8th September 2010 04:24 PM
X250.5 rdietzel Pass Labs 3 6th March 2008 09:39 PM
Pass X250.5 question for Nelson georgehifi Pass Labs 4 15th March 2005 07:37 PM
Bridged X250 kilowattski Pass Labs 3 14th March 2005 10:29 PM
X250 review Duck-Twacy Pass Labs 1 6th April 2003 08:26 PM


New To Site? Need Help?

All times are GMT. The time now is 04:41 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