Re: Speaking of audiophools

On Tue, 27 Jun 2006 01:27:09 +0100, Eeyore
<rabbitsfriendsandrelations@xxxxxxxxxxxxxxxxxxxxxx> wrote:



Jim Thompson wrote:

On Mon, 26 Jun 2006 15:53:46 -0700, Jim Thompson
<To-Email-Use-The-Envelope-Icon@xxxxxxxxxxxxxxx> wrote:

[snip]

I've often pondered building the amplifier right on the back of the
speaker, so that wire length is minimal. Then distribute the signal
to each amplifier thru a current loop.

...Jim Thompson

This is actually already done with some high-end ( and some not so high-end )
speakers. Typically called powered or active speakers. These also often include
'electronic crossovers' ( active filters at line level ) that are more accurate than
passive ones and allow direct connection of the driver to the amplifier with further
attendant benefits.

Why current loop though ? That'll be affected by cable capacitance. There's already a
very workable standard for audio voltage based distribution on balanced ( differential
) cables.

Not significant when the receiving end impedance is a virtual short
;-)


I see no-one has figured yet that the cable and the speaker form a 'filter' of sorts
that affects the frequency response. It's not insignificant.

Graham


...Jim Thompson
--
| James E.Thompson, P.E. | mens |
| Analog Innovations, Inc. | et |
| Analog/Mixed-Signal ASIC's and Discrete Systems | manus |
| Phoenix, Arizona Voice:(480)460-2350 | |
| E-mail Address at Website Fax:(480)460-2142 | Brass Rat |
| http://www.analog-innovations.com | 1962 |

I love to cook with wine. Sometimes I even put it in the food.
.

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