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Beolab / Beomaster 5000 speaker question...

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MrRoast
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MrRoast posted on Tue, May 21 2013 8:19 PM

Hello all,

I've just acquired a lovely Beolab (1967)/Beomaster (1969) 5000 and have a question about the speakers I can use with it.

I was going to connect it to a pair of CX 100s and a pair of CX 50s (replacing the Beomaster 1000 I'm currently using) but when I did this I could barely hear anything even with the volume up to 10! I connected a pair of 2702s and everything works perfectly.

I've looked online and read about damage that can be caused to an amplifier if you use the incorrect impedance speakers but was slightly confused as in an this archived thread one of the users was using CX 100s. I know that the 2702s are 4 ohm and CX 100s are 6 ohm but am mystified why the volume on mine was so low!? 

Any help greatly appreciated as I'm itching to start using it!

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j0hnbarker
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Turn the Beolab over and check which input you are using. Then check the two small screws that are labelled on the underside with each channel for that input, and make sure they are not turned down towards the - mark. If they are, turn them both up equally to the + mark.

Try that and see how you go.

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chartz
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chartz replied on Tue, May 21 2013 8:43 PM

Hi,

Well it's a matter of efficiency really. CX speakers are notoriously inefficient speakers. They are not the ideal night club banger!

This said, the Beolab will drive anything. I drive Arcam One (87 dB) very safely, the amp gets barely lukewarm, and believe me, it gets loud!

Jacques

MrRoast
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Thanks charz,

I'm still wondering why the CX100s are barely audible even at full volume? Assuming the Beolab will drive any Beovox speaker as you mention does this mean there's a problem somewhere?

 

 

Beobuddy
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What kind of source do you use?

Using an iPod or any other more modern "line" level device will not be able to produce a sufficient level for the BM5000.

The older BM5000 was designed for the older "Din" level standard. So, a kind of mismatch occurs.

But, beside that, a reasonable amount of music must be heard/obtained.

j0hnbarker
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Verified by MrRoast

Turn the Beolab over and check which input you are using. Then check the two small screws that are labelled on the underside with each channel for that input, and make sure they are not turned down towards the - mark. If they are, turn them both up equally to the + mark.

Try that and see how you go.

chartz
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chartz replied on Thu, May 23 2013 3:40 PM

My Beomaster has an old tape-recorder and a CD player connected. My iPhone poses no level problem either. It is a totally universal integrated amp.

Since the Beolab work with other speakers, it is not a level problem at the preamp.

Do you connect your CXs to the correct speaker outputs, not one to the bridged one by any chance?

Do your CXs work with other amps?

Jacques

Beobuddy
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It depends on the output from the cd-player. But it's common knowledge that the din and line level have different standards, resulting in different audio levels. I had several people complaining about the maximum volume, which they found not loud enough for having a party.

Some B&O gear have the option to adjust the level of the attached sources, like the BM8000.

Probably the lower impedance from the 2702's result in a better performence as it needs a lower voltage power supply. That's where the BM5000 has it's limitations. Just my thought.

MrRoast
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Thanks for all the suggestions!

@ Beobuddy - when I connected the 2702s everything worked well, including a line input (on AUX) from my iPhone - it was the impedance difference of the speakers that I was suspecting but the fact that other members are successfully using the CX 100s stumped me. Ideally I'd like to use my CX speakers as they're 'plumbed in' to the room Sad 

@ j0hnbarker - looked at these when I first got the amp but didn't adjust, tried a Beogram 1202 and iPhone via AUX input but the same result with the CXs, as above everything was fine with the 2702s though

@ chartz - I made sure the speakers were connected to the L / R speaker 1 outputs and not the 'centre' speaker, again everything spot-on with the 2702s

Hmmm, sounds like a speaker impedance issue (pardon the pun!) - but I don't really have the space for larger size speakers Crying

 

 

MrRoast
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Oh and @ chartz - the CXs work perfectly with my Beomaster 1000

tournedos
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I wonder if the cables you are using for the CXs are incorrectly wired (opposing phases). This could more or less kill the bass, making them sound quiet in comparison... but perhaps still not dramatically more silent.

EDIT: according to your last post with the BM1000 info... apparently not.

--mika

MrRoast
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Just found and read the Beolab 5000 user guide and it states the amplifier can be used with speakers with impedance of 4 - 16 ohm, but with the corresponding drop in volume. 

This reassures me that I'm not going to destroy the amp or speakers but still odd that I can't hear virtually anything!

I will have a play around this weekend and see what I can come up with.

tournedos
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MrRoast:
This reassures me that I'm not going to destroy the amp or speakers but still odd that I can't hear virtually anything!

That's certainly not right. I wonder if the DIN plugs you have in the CX wiring just don't make proper contact with the sockets in the Beolab.

--mika

MrRoast
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Hmmm, I'll try with a different set of cables, although the ones I used are genuine B&O cables that came with the CXs when I bought them.

Magnus
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Magnus replied on Sun, May 26 2013 11:31 AM
I'm using one pair of CX50 and one pair of RL6000 to my Beolab 5000. At volume 3-4 the sound it's quite loud. When I have all 4 speakers on, the volume is little higher on the CX-speakers due to the difference of 6 versus 8 ohm.

I suspect it's a contact problem somewhere.

/Magnus
chartz
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chartz replied on Sun, May 26 2013 1:13 PM

Hey Magnus you're using my picture!

You are welcome to do so Wink

Jacques

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