|
Audio Asylum Thread Printer Get a view of an entire thread on one page |
For Sale Ads |
73.169.153.194
In Reply to: RE: Bob Carver tweaked a SS amp to sound exacly like a CJ years ago... posted by Rod M on November 20, 2020 at 18:19:17
Some speakers (not many!) are designed for use with low-damping-factor amps.Interestingly, it has the advantage of "cheating" on Hoffman's Iron Law; you can get a bit more efficiency from a bigger magnet on an otherwise-identical driver, in the same box.
Edits: 11/23/20Follow Ups:
Horns?
How does one know?
What speaker measurements tell the tale?
Thanks.
Apologies - I have corrected my post.
might make it more suited for low damping factor amps.Bigger magnets?
Sensitivity?
Boxes vs. horns?
If it's magnet size, guessing the JBL 2441's on Edgar 'salad bowls' should qualify?
Edits: 11/23/20
In this case, I'm just talking about bass. The low damping factor raises the effective Q of the driver, while a bigger magnet decreases it. So you can make the same alignment in the same box with the same cone, while the larger magnet increases the efficiency.
As I understand it, in the early post-WWII days many speakers were maximum efficiency designs with huge magnets and a low Q. This made them suitable for bass horns, but as direct radiators their Q was too low to get deep bass. A solution was unity damping (output impedance of the amp was equal to the driver's DCR), and there were several amplifiers that used a mix of positive and negative feedback to create unity damping, usually with a switch to choose between high damping and unity damping.
My simple take is that amplifiers and speakers form a system: factor the amplifier output impedance into the design of the speaker. SET (in combination with a speaker) bass need not be "mushy" as some claim.
"Confusion of goals and perfection of means seems to characterise our age." Albert Einstein
As I recall it was a totally subjective listening test. That makes the conclusions drawn suspect. Watch this video starting at the 2:45 marker.
I have spoken with Gordon Holt about the process and he assured me Carver accomplished what he claimed.
if I remember the controversy correctly surrounding that claim Carver's concoction only reproduced the mid range and HF characteristics
regards,
Carver's concoction didn't duplicate tuba amp characteristics when said tube amp is pushed past its linear response capabilities. It's the same reason why a 50 watt 6L6 push-pull doesn't sound like a 3 watt SET at the same volume.
sounds like the real world to me
'tuba amp' ; )
... I'm stealing that
regards,
FAQ |
Post a Message! |
Forgot Password? |
|
||||||||||||||
|
This post is made possible by the generous support of people like you and our sponsors: