x150 vs. 250/350 - 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 13th July 2003, 03:48 PM   #1
dream is offline dream  Tibet
diyAudio Member
 
Join Date: Jun 2003
Location: taiwan
Default x150 vs. 250/350

i'm a newbie here. and my system is x2.5 + x150 + b&w m801s2.

i have a chance to upgrade to x250 or x350. do you think it's a must or a good idea for my m801s2? it's said that x150 has the best sonic purity and is the most transparent. my m801s2 is very revealing so that i'm afraid x250/350 will sound harsher than x150. any analysis between will be very appreciated.


btw, it seems x350/600/1000 are slightly different from x150/250 in terms of spec such as damping factor. x150/250 has a damping factor at 250 while x350/600/1000 at 30. it's very strange too for me that x350 has 26db gain in contrast to 30db for x150/250/600/1000.
  Reply With Quote
Old 28th July 2003, 03:51 PM   #2
dream is offline dream  Tibet
diyAudio Member
 
Join Date: Jun 2003
Location: taiwan
seems not a good topic here.
nobody gave comments
  Reply With Quote
Old 28th July 2003, 06:09 PM   #3
diyAudio Member
 
Join Date: Jan 2001
Location: Scandinavia
This is more or less a DIY forum where it is unlikely that the majority of the members have had the pleasure of evaluating even one of the aforementioened amps.

My take on this is that you should:

1. Ideally take the new unit home to sample, then make the decision.
2. Since you have a balanced source, there is no reason why you should not be able to move. As you know, the smaller X units accept single ended more readily as I recall.
3. I am personally not a favourite of very high wattage units, but if you do go to a higher wattage, you will also get more output devices, better power supply etc. You will also get a different input stage (at least for the 350) which probably operates at significantly higher current and is thus capable of driving the output stage better (to the best of my knowledge anyhow).
4. If you get stuck, contact the factory for support. I am pretty sure they will tell you that the larger units behave better.

My personal feeling is that I don't like the aestetics of the 150. If money is no object, you simply have to move to the larger units.

Petter
  Reply With Quote
Old 28th July 2003, 08:19 PM   #4
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Petter is right. You have to try the amps out in your system
to find out.

It seems that for most designs, there is a "sweet spot" for
size and bias, etc. For the X series, that would be the X600
in my opinion. For the Alephs, it would be the Aleph 2.

It remains to be seen for the XA and the Zens.

  Reply With Quote
Old 28th July 2003, 08:35 PM   #5
diyAudio Member
 
Join Date: Feb 2001
Location: Mars
Is this 'sweet spot' due to the human being's natural
craving for more amplifier power
  Reply With Quote
Old 29th July 2003, 12:04 AM   #6
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Not usually, otherwise the X1000 would represent the Pass
Labs sweet spot.
  Reply With Quote
Old 29th July 2003, 03:16 AM   #7
diyAudio Member
 
Brian Donaldson's Avatar
 
Join Date: Jan 2003
Location: Texas, Love it or leave it
But it requires a fork lift, dedicated electrical panel, and 2 extra tons of A/C.
  Reply With Quote
Old 29th July 2003, 03:55 AM   #8
The one and only
 
Nelson Pass's Avatar
 
Join Date: Mar 2001
Actually it only draws an extra 150 watts or so.
  Reply With Quote
Old 30th July 2003, 03:58 PM   #9
dream is offline dream  Tibet
diyAudio Member
 
Join Date: Jun 2003
Location: taiwan
thx all you guys. especially nelson.

i'll try it in my house.

thx for your remind that here is a diy forum.
so let's go back to technical aspects of x series.

according to nelson, the sweet spot of x series circuitry corresponds to x600. how far apart are x350 or x250, in term of any technical merit.

btw, i saw many people on net waiting for nelson's baby x600 or mono-mono x250/350.
  Reply With Quote
Old 30th July 2003, 08:28 PM   #10
diyAudio Member
 
Join Date: Jan 2001
Location: Scandinavia
To my knowledge (looking at photographs), the 250 is the top of the line for the "smaller units", a series which came after the larger units. It appears unlikely that this circuitry will be as effective driving the larger units but that is pure speculation. Thus, the 250 maxes out the lower line. The slightly different topology, or at least part choice may explain the different specifications which you have already pointed out.

The 350 is the smallest of the big boys (the original series). There appears to be precious little that puts this unit apart from it's even bigger brothers, apart from power supply and number of output devices.

Then again, it might just be that the new unit is "better", and the old line simply remained unchanged. I doubt it, however. As you might expect from the above, it appears like the smaller and larger lines are two branches of similar technology - and each line has a common theme (the input stage) and differ mostly by size of power supply, number of transistors etc.

At the end of the day, I am glad that you have the opportunity to check these units in your home and hope that you will post your results back to this forum.

Good luck.

Petter
  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
X150.5 manual ? barti Pass Labs 6 1st November 2009 04:10 PM
12V Trigger for X150.5 rc5al Pass Labs 8 15th December 2008 05:12 PM
pass x150.5 barti Pass Labs 2 18th October 2008 04:03 PM
X150 amplifier compatibility Heiney9 Pass Labs 8 1st October 2007 09:21 PM
PassLabs X150.5 in Hiraga's Nouvelle Revue Du Son CheffDeGaar Pass Labs 10 10th November 2005 04:16 AM


New To Site? Need Help?

All times are GMT. The time now is 11:54 PM.


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