# Talk:Impedance bridging

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## Complex Impedance

For the general case of complex impedance, the load voltage is maximal at ${\displaystyle Z_{L}={\frac {2Z_{S}{\bar {Z_{S}}}}{Z_{S}-{\bar {Z_{S}}}}}}$. I believe this must be mentioned. Leokor (talk) 02:57, 12 February 2013 (UTC)

## Article name

I moved this to impedance bridging since it gives this idea that it is the "opposite" of impedance matching, but the term "voltage bridging" i think is more common.

Also they are not opposites really. One maximizes power and one maximizes voltage. Not opposites.

Also to differentiate it from a bridged amplifier, in which two positive outputs are inverted from each other and used to drive a load in a floating type configuration. not the same thing.

Also I am going to keep editing these. - Omegatron 20:54, Jun 23, 2004 (UTC)

### Voltage bridging

Moved from Talk:Impedance matchingOmegatron 19:51, 13 April 2007 (UTC)

Is this an acccepted term in the industry?--Light current 03:29, 16 December 2006 (UTC)

No. We kind of made it up, from the common term "bridging". Do you know of a better one? — Omegatron 04:08, 5 January 2007 (UTC)
No, but I didnt think neologisms or original research (terminology) were allowed 8-)--Light current 17:48, 5 January 2007 (UTC)
The only terms I can think of is 'parallel connection' or 'tapping' as in phone tapping--Light current 18:53, 5 January 2007 (UTC)

It's not actually made up, but it's not commonly referred to by name:

• "Calculation the damping of impedance bridging or matching an interface connecting Zout and Zin""[1]
• "If the load impedance is 10 times or more the source impedance, it is called a "bridging" impedance. Bridging results in maximum VOLTAGE transfer from the source to the load."[2]
• This might be related?
• "High-impedance bridging input does not load signal source"[3]
• "High impedance/bridging" inputs [4]
• "High-impedance bridging inputs allow connection from either high or low impedance sources."[5]
• "Actual output impedance is 100 ohms (47 ohms unbalanced) and the TB-6 "Mic-All" amplifiers will drive virtually any line load from 600 ohms to high impedance bridging!"[6]

"High-impedance bridging" might actually be a better term? — Omegatron 19:14, 5 January 2007 (UTC)

Since the term 'high impedance bridging' is in the literature, I think we could use that. Voltage bridging merely redirects to impedance bridging, so its just a matter of deleting the voltage bridging page. —The preceding unsigned comment was added by Light current (talkcontribs) 20:11, 5 January 2007 (UTC).
What literature?
Why would you delete the redirect? — Omegatron 21:21, 5 January 2007 (UTC)

Here is a book that mentions "bridging" vs "matching".

http://books.google.com/books?id=wBlRtAlKPFsC&dq=%22impedance+bridging%22&q=bridging#searchOmegatron 19:50, 13 April 2007 (UTC)

## "Second Device" vs. "Previous Device"

"It is a bridging connection if the second device does not appreciably load the previous device." Which is the "second" device? The load or the source? How is "previous" defined here? I'm pretty sure that this means that the source does not appreciably load the load device, but this language could be clearer. Steve carlson 23:27, 9 March 2007 (UTC)

## Amp-versus-speaker not relevant at all!

The connection between an amplifier and speaker is not an instance of impedance bridging. Amplifiers are current sources.

The reason why a low output impedance is desired is for two reasons: damping, which is an electro-mechanical effect, and maximum power transfer to the speaker.

The purpose of this connection is not to pass along a signal to the speaker with minimal voltage drop, but to drop current into the speaker while dissipating as little heat as possible in the amplifier and controlling the speaker's motion. — Preceding unsigned comment added by 192.139.122.42 (talk) 23:46, 2 June 2011 (UTC)

I too saw this section and came here to comment that it's not relevant in an article about impedance bridging. The whole section should be deleted or moved somewhere else. — Brianonn (talk) 07:39, 12 September 2011 (UTC)
This section seems to be VERY important. There is too much lack of understanding.
Amplifiers are voltage sources. A voltage source allows maximum power transfer to the speaker. And .. it is often said the amplifiers has 8 Ohm , but the source impedance of the amplifier will be like 0.1 Ohm. Edited to show the peculiarities of this special bridging.
--AK45500 (talk) 12:56, 5 September 2018 (UTC)

## Reference 404's

I'm just pointing out that the Rod Elliot reference now 404's. I found this article. http://sound.whsites.net/impedanc.htm but am not sure if it's equivalent. — Preceding unsigned comment added by Petergcook (talkcontribs) 00:52, 28 November 2016 (UTC)

seems to work --AK45500 (talk) 13:08, 5 September 2018 (UTC)