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Difference between bridged and parallel amp?

P

Pooh Bear

Jan 1, 1970
0
François Yves Le Gal said:
I know. But you can parallel two amp modules, use proper current balancing
resistors and derive proper feedback (if needed).

That's true but the result is inferior to a single amp designed for the
purpose.

Graham
 
F

François Yves Le Gal

Jan 1, 1970
0
That's true but the result is inferior to a single amp designed for the
purpose.

Probably. But who cares nowadays with very high quality 1 Kw/4 Ohm class D
amp modules - with built-in SMPS, of course! - costing less than USD 200 in
OEM quantities ?
 
P

Phil Allison

Jan 1, 1970
0
"François Yves Le Gal"
Probably. But who cares nowadays with very high quality 1 Kw/4 Ohm class D
amp modules - with built-in SMPS, of course! - costing less than USD 200
in
OEM quantities ?


** Care to reveal the merchant ?

Tres interessant.




............ Phil
 
P

Pooh Bear

Jan 1, 1970
0
François Yves Le Gal said:
Probably. But who cares nowadays with very high quality 1 Kw/4 Ohm class D
amp modules - with built-in SMPS, of course! - costing less than USD 200 in
OEM quantities ?

I guess that depends on the THD figures and so on that you don't mind.


Graham
 
F

François Yves Le Gal

Jan 1, 1970
0
I guess that depends on the THD figures and so on that you don't mind.

These modules are state of the art. A number of "audiophile" companies are
using them in stock form, other have slightly customized versions
manufactured for them.
 
J

John Fields

Jan 1, 1970
0
Then what about amps using multiple output devices in parallel ? They all
must look like near short-circuits to each other, don't them ?
 
F

François Yves Le Gal

Jan 1, 1970
0
The issue of price was raised:

http://www.audiokabel.dk/da-amps.htm

3900 Kroener exchanges out at about $650. About 6 DKK per
USD

That's the retail price for a *complete* amp, including case, connectors,
packaging et al.

The OEM module - here a 500 w/4 ohm version - costs much less, say less than
USD 150 FOB in OEM quantities.

Now a little bit of fun.

Let's have a look at the web site of a manufacturer using ASP modules:

Say, Red Dragon Audio.

http://www.reddragonaudio.com/main.htm

Their SA 1000 is sold direct for USD 1,799 (plus tax and shipping)

http://www.reddragonaudio.com/sa1000.htm

It uses two 1000ASP modules housed in a very nice aluminum box fitted with
sturdy sockets, jacks, binding posts and feet,, which looks identical to the
Entry 130 manufactured in China and sold in North America by Digital
Analogue DIY for USD 130 (Qty one, end user price).

http://www.digitalanaloguediy.com/entry130.html

Hmmm. Some modules - minimum order is half a pallet, 80 modules, so you have
to front something like 30 G's, some nice boxes, a couple of feet of
internal wiring, a mains cable, a sturdy UPS-proof box and a laser-printed
user manual

Presto, a new "manufacturer" is born...

(All this in order to show that the wide availability of OEM modules will
have the same effect on the audio market than it had on PC's: we'll see more
and more state of the art products at affordable prices. We'll also see
manufacturers trying to differentiate their offerings with tweaked or
custome solutions).
 
A

Arny Krueger

Jan 1, 1970
0
François Yves Le Gal said:
That's the retail price for a *complete* amp, including
case, connectors, packaging et al.
Agreed.

The OEM module - here a 500 w/4 ohm version - costs much
less, say less than USD 150 FOB in OEM quantities.

Let's hope so, or the guys at
http://www.audiokabel.dk/da-amps.htm are running a
money-losing operation.
Now for a little bit of fun.
Let's have a look at the web site of a manufacturer using
ASP modules:
Say, Red Dragon Audio.

Their SA 1000 is sold direct for USD 1,799 (plus tax and
shipping)


Pricey for a 600 wpc/8 ohm amp.
It uses two 1000ASP modules housed in a very nice
aluminum box fitted with sturdy sockets, jacks, binding
posts and feet,, which looks identical to the Entry 130
manufactured in China and sold in North America by
Digital Analogue DIY for USD 130 (Qty one, end user
price).

http://www.digitalanaloguediy.com/entry130.html

Isn't that the same gif on both web sites?
Hmmm. Some modules - minimum order is half a pallet, 80
modules, so you have to front something like 30 G's, some
nice boxes, a couple of feet of internal wiring, a mains
cable, a sturdy UPS-proof box and a laser-printed user
manual
Presto, a new "manufacturer" is born...

i.e., red dragon audio! ;-)
(All this in order to show that the wide availability of
OEM modules will have the same effect on the audio market
than it had on PC's: we'll see more and more state of the
art products at affordable prices. We'll also see
manufacturers trying to differentiate their offerings
with tweaked or custom solutions).

Could be.
 
S

Stewart Pinkerton

Jan 1, 1970
0
The manufacturer... Scandinavian-based. Ice something.

Aah, are you referring to the B&O ICE modules? Proving very popular
now that they've proved their chops in the Lab 5 speakers.
 
F

François Yves Le Gal

Jan 1, 1970
0
Isn't that the same gif on both web sites?

It awfully looks like the same .gif.

I can't be affirmative as I've not run an ABX double blid triple Dutch
test...
:)
 
A

Arny Krueger

Jan 1, 1970
0
François Yves Le Gal said:
It awfully looks like the same .gif.

I can't be affirmative as I've not run an ABX double blid
triple Dutch test...
:)

I think it was clever how they avoided the need for a new
gif by keeping the front panel clean. I do like at least a
power indicator on the front panel, though. ;-)
 
R

Rich Grise

Jan 1, 1970
0
Isn't that the same gif on both web sites?

No, they're the same, but they're jpg's. ;-)

$ ls en*
entry130_front.jpg-1 entry130_front.jpg-2
richgrise@thunderbird:~
$ diff entry130_front.jpg-1 entry130_front.jpg-2
richgrise@thunderbird:~
$

Cheers!
Rich
 
P

PanHandler

Jan 1, 1970
0
One UK company sold/sells sound system amplifiers with two 60 W MOSFET amp
modules in parallel. It works, but it worried me a lot when I first saw
it. There are no current-sharing resistors and no cross-connections of any
sort. Not happy at full output at 20 kHz, though; smoke happens.

Amplifiers run on smoke. When the smoke comes out they stop running. Very
simple!
 
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