Failure or not? - diyAudio
Go Back   Home > Forums > Source & Line > Analog Line Level
Home Forums Rules Articles diyAudio Store Gallery Wiki Blogs Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

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 2nd July 2015, 02:34 PM   #1
diyAudio Member
 
Join Date: Feb 2009
Location: UK
Default Failure or not?

Good afternoon to all,

I didn't know where to start this thread, maybe it shouldn't be in DIYAUDIO in which case I'll remove it if asked.

I used to run a cd player directly to my P2100 yamaha amp with a pair of B&W dm2a. The upgrade bug struck me and I bought a Yamaha PC2002M for cheap. I sent it for a good oil change and it came back cleaned up with new light bulds (LEDs tough) but sounding WAY too loud (I couldn't go more than 1 graduation up on the attenuators). Thinking it might be normal (it is a much more powerful amp than the previous one) I went on and found a good deal on a Crown PSl-2 (no MOT or oil change on that one yet), the spec convinced me.

This setup: marantz CD 5001 + PSL-2 + PC2002M + DM2A is now more reasonable for ear protection purposes but I am not convinced sound wise at all. It is just too bassy (clean bass though) and I need to raise the volume a lot to get a good soundstage. It is worth writing that I haven't changed the room at all (and I know it's not the best setup for such a place) so the comparison in terms of acoustics is like for like. In the future I intend to use the crown as a volume control and switch (which it should do really well as, according to the spec, it should be transparent with tones defeated) but I not yet convinced.

What do you think could be the issue? If I need to send my PC2002M back I am not sure I trust the guys who did the works (these guys are real pros but I think I'll go to a yamaha pro audio approved tech).

thank you in advance for your reply/ies.

Best Regards

Geoffroy
__________________
P-2100, P-2002M, Crown PSL-2, B&W DM2a
  Reply With Quote
Old 6th August 2015, 10:26 AM   #2
diyAudio Member
 
thaumaturge's Avatar
 
Join Date: Aug 2011
Location: Utah
Is it possible that you plugged into an amplified -headphone out- vs a "line" output on the CD when you reconnected it? That would explain your sudden volume surge.
Doc
__________________
Noli timere problematum affigit
  Reply With Quote
Old 6th August 2015, 11:55 AM   #3
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
have you got "Power Amplifiers" or do they have some other inputs that are not flat, or have extra gain?
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 6th August 2015, 12:11 PM   #4
diyAudio Member
 
Join Date: Mar 2014
they are both 0.775V in for full power, but the new amp is 3 times the power so will have 18dB more gain. Looking at the specs they both have input attenuators, but these are pro amps so this is for setup rather than operation. The marantz doesn't have a variable output so a pre-amp would be needed (unity gain buffer type).
  Reply With Quote
Old 6th August 2015, 01:14 PM   #5
DF96 is offline DF96  England
diyAudio Member
 
Join Date: May 2007
3 times the power is 4.7dB, not 18dB. 3 times the voltage would be 9.4dB. 18dB is 8 times the voltage or 64 times the power.

Quote:
Originally Posted by Geoffroy
these guys are real pros
Note that in audio "real pros" may be exceedingly incompetent, or hugely competent, and you can't tell from customer reviews or magazines which is which.
  Reply With Quote
Old 6th August 2015, 01:17 PM   #6
diyAudio Member
 
Join Date: Mar 2014
Quote:
Originally Posted by DF96 View Post
3 times the power is 4.7dB, not 18dB. 3 times the voltage would be 9.4dB. 18dB is 8 times the voltage or 64 times the power.
yes sorry, was trying to think, type and deal with a little squeaker all at once on 3 hours sleep. Multi-tasking is for the wife
  Reply With Quote
Old 6th August 2015, 02:13 PM   #7
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
You're excused. A problem I have never had to deal with.
__________________
regards Andrew T.
Sent from my desktop computer using a keyboard
  Reply With Quote
Old 6th August 2015, 02:18 PM   #8
diyAudio Member
 
Join Date: Mar 2014
The first 18 years are the worst!
  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
TO 3 failure on vibration gmphadte Solid State 24 6th February 2014 08:57 AM
EL34 Failure PeteM Tubes / Valves 14 21st March 2007 01:25 AM
Google Failure? Bas Horneman Everything Else 6 21st October 2005 03:55 PM
Tube Failure jwatts Tubes / Valves 11 12th February 2005 07:54 AM
7591EH failure Frank Berry Tubes / Valves 10 30th August 2004 06:18 AM


New To Site? Need Help?

All times are GMT. The time now is 01:26 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2016 DragonByte Technologies Ltd.
Copyright 1999-2016 diyAudio

Content Relevant URLs by vBSEO 3.3.2
Wiki