|
Home | Forums | Rules | Articles | diyAudio Store | Blogs | Gallery | Wiki | 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 |
![]() |
#1 |
diyAudio Member
Join Date: Jan 2005
Location: UK
|
![]()
Hi,
http://www.cambridgeaudio.com/assets...r8-2-06web.pdf Not sure I understand it. Link may have been posted elsewhere on forum but I couldn't find it. |
![]() |
![]() |
#2 | |
Account Disabled
Join Date: Jun 2004
Location: Animal farm
|
Messrs Bramble and Self state the following:
Quote:
Otherwise, with an invariably reactive 'speaker load, the location of crossover will be displaced by the same angle as the phase difference between load current and voltage. |
|
![]() |
![]() |
#3 |
diyAudio Member
Join Date: Oct 2004
|
No matter if the crossover point is displaced in time or not, you STILL get crossover distortion. Pure resistive load or not, it matters not.
Having the crossover point outside the 'normal' listening zone will decrease distortion. Just upping the bias gives you two distortion points, something Doug Self doesn't like. Class XD is an interesting idea, as to if its actually any good..... |
![]() |
![]() |
#4 |
Account Disabled
Join Date: Jun 2004
Location: Animal farm
|
Ultimately, with real 'speakers, this displacement will occur anyway, and as such demonstrating that it can be obtained with resistive loads, while fascinating, is of dubious utility in practice.
|
![]() |
![]() |
#5 |
diyAudio Member
Join Date: Jun 2004
Location: Warsaw
|
remember Graham Maynard's amplifier?
This idea basically changes THD vs. power characteristic (on any load), which might be good indeed, because low level signal will be less distorted, while at high level distortion goes up. This might give impression of "good" dynamics, 'silence' more silent and loudness more loud, old class A trick. |
![]() |
![]() |
#6 |
diyAudio Member
Join Date: Jan 2004
Location: Finland
|
How can Douglas Self patent an idea he has already disclosed!?
![]() The picture is from his homepage. ![]() What I can see is a modulating CCS in the lower end reminding of Class XD, though I can't be really sure as I have not seen his schematics yet. Cheers Michael PS. EDIT: Funny the picture gets 3 times bigger when inserted here while it's only 300x400 pixels at his homepage??? ![]() |
![]() |
![]() |
#7 |
diyAudio Member
Join Date: May 2002
Location: Switzerland
|
I once modelled an amp with a modulated current source and a source follower in the output stage (i.e. both MOSFET). The results were quite promising (O.K it was just a simulation ....).
But is was DC coupled unlike Self's example. Regards Charles |
![]() |
![]() |
#8 | |
The one and only
|
Quote:
to agree. If Doug Self weren't so self-referencing, he could list numerous examples of prior art, some of them mine. ![]() |
|
![]() |
![]() |
#9 |
diyAudio Member
Join Date: Jun 2004
Location: Warsaw
|
pig or pigeon
![]() |
![]() |
![]() |
#10 | |
Account Disabled
Join Date: Jun 2004
Location: Animal farm
|
Quote:
![]() |
|
![]() |
![]() |
Thread Tools | Search this Thread |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
1500W RMS Class D PCB - which Class D Driver Chip is it ? | mosfetsound | Class D | 11 | 1st April 2011 11:17 AM |
Can a Class AB PP amp be said to be operating in Class A at low signal levels? | ray_moth | Tubes / Valves | 19 | 23rd January 2009 07:52 PM |
How about a round-up of Class A kit power amps, or collectable vintage class A? | Brisso57 | Solid State | 4 | 14th February 2007 10:30 AM |
New To Site? | Need Help? |