
Home  Forums  Rules  Articles  diyAudio Store  Gallery  Wiki  Blogs  Register  Donations  FAQ  Calendar  Search  Today's Posts  Mark Forums Read  Search 
Solid State Talk all about solid state amplification. 

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 

Thread Tools  Search this Thread 
14th February 2010, 11:06 PM  #1 
diyAudio Member

Accuphase MCS
Hi, I donīt understed how MCS (Multipli Circuit Summingup) improve the S/N ratio or THD.
Accuphase Laboratory, Inc.?MCS We get at the input v(t)+noise(t), 3 linears amps with gain A1, A2 and A3, then ouput is: (A1+A2+A3)*v(t) + (A1+A2+A3)*noise(t) Or noise is not corralated and I canīt sum A1*noise(t)+A2*noise(t)+A3*noise(t)? How improved the distorsion?
__________________
 Music by John Williams  
15th February 2010, 02:11 AM  #2 
diyAudio Member
Join Date: Feb 2005
Location: Zagreb

You have a number of errors in your reasoning that come from not understanding some basic circuit rules.
Amplification factors do NOT sum unless amplifiers 1, 2, 3 are in series  NOT in parallel. For the signals to simply add as is shown in this circuit, amplification factors of 1, 2, 3 MUST be the same, i.e. A1=A2=A3=A. The total amplification factor of such amps in parallel remains the same as that of a single amp, A. A*noise(t) as well as distortion(t) are not correlated so they have to add as random vectors. Assuming noise(t) is of equal amplitude but not correlated between amplifiers 1, 2, 3, the total noise is noise(t)/(square root of 3), as is total THD.In reality, noise does behave as uncorrelated, distortion less so, so the drop in distortion is usually less than the theoretical 1/(square root of number of identical amps in parralel). 
15th February 2010, 09:59 AM  #3 
diyAudio Member
Join Date: Jul 2003
Location: Norfolk, England

Good summary ilimzn.

15th February 2010, 12:45 PM  #4  
diyAudio Member

Yep, very clear ilimzn, thanks.
Accuphase Quote:
Whatīs the crucial point?
__________________
 Music by John Williams  

Thread Tools  Search this Thread 


Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Best Turntable? Yamaha P220, MCS 6725, Sony PSLX250H  GeneralUSGrant  Analogue Source  3  22nd July 2009 12:20 AM 
Trapping MCs  Salas  Analogue Source  38  10th November 2008 02:19 AM 
MCS Series audio  karenjo1  Parts  3  11th October 2007 08:58 PM 
Mcs Series Solid State Stereo Receiver ~ Jc Penney Co.  sandman  Solid State  7  9th February 2007 01:21 AM 
Accuphase schematic  Jarno  Solid State  3  11th September 2005 08:56 PM 
New To Site?  Need Help? 