Burmester 911 mk3

[microstrip]

Ok, seems easy enough. I will need to find a spare XLR cable and the 10 kOhm resisters which should not be a problem. I assume I need to take the reading with the speaker load disconnected from the amp?

If I am going to do this I want to test the SE input impedance also. Same procedure however just insert the XLR->RCA adapter in the chain?

You said "and I did not make any mistake," can you or someone else confirm this before I start messing around with my amp please?

You can keep the speakers connected - setting a typical voltage around 150 mV RMS at the output for the first reading is enough and does not produce too much noise.
For the RCA input impedance the formula should be Rin = Vb /(Va-Vb) * 10kohm.

[AudioExplorations]

You can keep the speakers connected - setting a typical voltage around 150 mV RMS at the output for the first reading is enough and does not produce too much noise.
For the RCA input impedance the formula should be Rin = Vb /(Va-Vb) * 10kohm.

Great thanks. I just picked up a cheap 50cm XLR cable and some 10 kOhm resistors (I assume 1/4W 10k resistors are OK, they had 1W also). Will test it tonight.

[MarinJim]

Your new signature

Weiss Medea Plus - Burmester 911 mk3 - TAD CR1
Experimental music blog at: www.audioexplorations.com
Experimental Burmester 911 MK3 ohm tester

[AudioExplorations]

Ok, the moment of truth...



Balanced:

Va = 1.441
Vb = 0.134

Rin = 2.051 kOhm

Unbalanced:

Va = 0.633
Vb = 0.058

Rin = 1.009 kOhm

[AudioExplorations]

So, balanced is the same as the spec, the unbalanced is 1 kOhm instead of the published 20kOhm. Does this make technical sense or did something go wrong with the measurement (given the balanced seems right I would assume not)?

[microstrip]

So, balanced is the same as the spec, the unbalanced is 1 kOhm instead of the published 20kOhm. Does this make technical sense or did something go wrong with the measurement (given the balanced seems right I would assume not)?

AudioExplorations,

Thanks a lot. You got exactly the results we could anticipate. This will also raise my consideration for the ARC REF5 - I could not imagine it would drive a 2Kohm load!

[Thf99]

Robert Harley of TAS would be the right person to consult on this subject. He mentioned that in practice, there is very little chance of a mismatch between pre and power amps.

[NorthStar]

Robert Harley of TAS would be the right person to consult on this subject. He mentioned that in practice, there is very little chance of a mismatch between pre and power amps.

---- Would be cool to have Robert here as a member for the occasional post and interaction for our benefit.
{I'm sure he's a very buzy man.}

[MarinJim]

---- Would be cool to have Robert here as a member for the occasional post and interaction for our benefit.
{I'm sure he's a very buzy man.}

With some very smart members here, and don't think that is necessary.

[NorthStar]

With some very smart members here, and don't think that is necessary.

-----Exactly, it would be good for his own benefit.