My_Ref Fremen Edition RC - Build thread - Page 81 - diyAudio
Go Back   Home > Forums > Amplifiers > Chip Amps

Chip Amps Amplifiers based on integrated circuits

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 3rd December 2012, 11:29 PM   #801
diyAudio Member
 
Join Date: Mar 2012
Location: Chennai / India
Quote:
Originally Posted by bcmbob View Post
Badri, Do you have anything to measure SPL - similar to this?
No, I dont have Bob. I try to get one if it is locally available. But what is the use of it?
  Reply With Quote
Old 3rd December 2012, 11:51 PM   #802
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
That one is a little expensive if you don't use it a lot,and you might get a better deal on ebay or Amazon. I suggested it only because SPL (sound pressure level) is easier to interpret. There are standards expressed in db (decibels) the relate to real word situations. Loud, soft and such terms are all relative.

If you choose to, you can correlate your volume settings to a more scientific standard - also keyed to distance from the source of the sound. The efficiency and design of the speakers vary so much, it can be useful to know at what SPL in a given system the clipping occurs. There are also all the lab/hardware devices that can be even more informative - but that's still above my pay grade for now.

It obviously is not something that will influence the operation of the amp, and is completely optional - but is fun to have around.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."

Last edited by bcmbob; 3rd December 2012 at 11:59 PM.
  Reply With Quote
Old 4th December 2012, 12:33 AM   #803
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
Got my curiosity up so I went Googleing for "Software SPL Meter".
Found a couple possibilities:

REW - At least it looks impressive.

Audio Tool - Android app.

I downloaded both and will report in the morning.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 4th December 2012, 03:47 AM   #804
diyAudio Member
 
Join Date: Mar 2012
Location: Chennai / India
Any suggestions for the clipping issues?
  Reply With Quote
Old 4th December 2012, 07:16 AM   #805
diyAudio Member
 
Join Date: Nov 2009
Location: UK, Manchester
Quote:
Originally Posted by ClaveFremen View Post
Interesting... very similar impressions!
cool

Quote:
Originally Posted by ClaveFremen View Post
So, at the end a difference was there...
not huge, but noticeable! that is the main point.

Quote:
Originally Posted by badrisuper View Post
Yes it is loud enough to my room. But I wanted to try atleast 80% volume to see how loud it is!!!!
Mine 10k log Dale attenuator was set to 15th step out of 23 when I compared the caps. That was quite loud, not 80% of the scale, though more than a half. Do you use linear pot or log? It should be fine with the last one as we don't have linear hearing.

Last edited by dtses; 4th December 2012 at 07:23 AM.
  Reply With Quote
Old 4th December 2012, 09:10 AM   #806
diyAudio Member
 
Join Date: Mar 2012
Location: Chennai / India
Quote:
Originally Posted by dtses View Post
Mine 10k log Dale attenuator was set to 15th step out of 23 when I compared the caps. That was quite loud, not 80% of the scale, though more than a half. Do you use linear pot or log? It should be fine with the last one as we don't have linear hearing.
Its a linear tracking pot.
  Reply With Quote
Old 4th December 2012, 09:34 AM   #807
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
The Audio Tool app is really quite remarkable. It was nice enough that I upgraded to the paid version ($6.95). More useful real time information than the dedicated RS unit I've been using. I don't own an iPhone or iPad but I'm sure there is an equivalent available.

Just a reference - with JRiver flac files using the program volume control - playing through a Mini2496 DAC - pushing the Sunflower speakers, there is no clipping at max settings. Just very very loud
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  Reply With Quote
Old 4th December 2012, 09:39 AM   #808
Reality first!
diyAudio Member
 
ClaveFremen's Avatar
 
Join Date: May 2005
Location: Milan, Italy
Quote:
Originally Posted by badrisuper View Post
Its a linear tracking pot.
For volume control a log one should be used.

IMHO it explain why your volume goes up so quickly...
__________________
Dario
ClaveFremen "Bailando Salsa en el Sietch"
  Reply With Quote
Old 4th December 2012, 09:48 AM   #809
AndrewT is offline AndrewT  Scotland
diyAudio Member
 
Join Date: Jul 2004
Location: Scottish Borders
It is more likely that the system gain is too high.
A CDP putting out ~2.2Vac @ 0dBfs into an amplifier with 31.77times gain (+30dB) has the potential to give an output of 98Vpk if the amp supply rails were +-105Vdc.
Simply ludicrous to expect anything other than "just turned on" when using a normal potentiometer and bonkers to consider a linear law potentiometer.

read
What is Gain Structure?
__________________
regards Andrew T.

Last edited by AndrewT; 4th December 2012 at 09:59 AM.
  Reply With Quote
Old 4th December 2012, 11:00 AM   #810
bcmbob is offline bcmbob  United States
diyAudio Member
 
Join Date: Dec 2009
Location: Bay City, Michigan
REW (Room EQ Wizard) doesn't download completely in the Windows version. The OSX program is more sophisticated than Audio Tool but requires a mike input. I suspect it could be quite useful for FE builders - specially at the price - FREE.
__________________
Bob M.
"Arrange Whatever Pieces Come Your Way."
  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
My_Ref Fremen Edition - Beta build/Fine tuning ClaveFremen Chip Amps 1523 1st December 2013 11:16 AM
My_Ref Fremen Edition - need help on PCB evaluation ClaveFremen Chip Amps 450 23rd October 2013 03:38 PM
Last My_Ref Fremen Edition RC boards for sale ClaveFremen Swap Meet 3 4th December 2012 01:04 PM
Hx-Home Edition and Hx Mini Edition will be released December, 24th destroyer X Solid State 54 3rd September 2012 03:44 PM
Canton ERGO RC-1 (frequency room compensation) for RC-L - Schematic wanted tiefbassuebertr Multi-Way 2 20th September 2010 11:20 AM


New To Site? Need Help?

All times are GMT. The time now is 03:38 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