Beomaster 4400, bump on the speakears

[lollo]

Hi to all, I’m an old enthusiast of B&O products. My collection began over 50 years ago with a wonderful Beomaster 5000. Then came the Beomaster 1400, 3000, 1900, 3300, Beossound 3000 mk2 and now the Beomaster 4400. I just bought this last one and it works very well but I have a doubt. When I turn it on there is a bump noise on the speakers. I ask you if it is normal because I saw from the wiring diagram that there is a relay but I think it is connected to the protection device and not instead to a delay in connecting the speakers to avoid this. Someone can please clarify this. Thank you.

[chartz]

Hi,

The bump is normal. The relay is on the PSU rails, not the speakers.

[lollo]

1. Ok, thank you. I found a stupid but easy way to avoid the bump.  Just turn on the beomaster with the speakers unplugged :-). B regards

[chartz]

Or use the speaker switch, perhaps. ?

[Glitch]

lollo:  You might want to put a multimeter across the speaker outputs and check the DC offset voltage. This should be very close to 0.0V. Sometimes power-on “thumps” are normal/unavoidable, other times they are indicative of something else. It is hard to judge what you are actually experiencing from the information that you provided.

Glitch

[lollo]

• Ok, thank you. I will measure with the multimeter if there is Dc voltage on the speakers after switching on the beomaster.  If so, it would be a regulation problem of the final stage of the amplification which should thus be verified and investigated. But probably the bump is normal as Chartz reported. Yes Chartz, I use the switch to disconnect the speakers :-).

[Glitch]

My assumption was that you were experiencing something different than with your other/previous B&O receivers, otherwise you wouldn’t have asked the question.  If there is an issue, there are multiple things that can cause a speaker thump.

Glitch

[chartz]

Don’t worry, the 4400 has it with 0 mV offset. Not a problem really. I’ve been hearing that thump every single day for 10 years now, ever since I restored it!

My 1967 Beolab 5000 has it too.

As an aside, the 4400 sounds extremely good, probably my best B&O receiver.

[Author]

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