Hello everyone,
Today I just got a pair of speakers from the headline. I expected a miracle, but was heavily disappointed. The sound is awful. The bass is all over the place covering almost everything else. Overall sound is 'closed' if I can call it that way, vocals can hardly be heard, all in all - rubbish.
They are connected to Beomaster 5000 which worked excellent with my S45.2 - the sound was heavenly ;)
I have tried connecting via line from pre-amp outs, and also connecting via speaker out to the available terminals. The second option is slightly better, but still nowhere near what it should be.
Speaker settings are fine, all is set-up according to the Penta MK1 manual.
Seller told me that amplifiers were re-capped, and mids have new (rubber) surroundings.
I'm seeking an advice on where to start looking for the potential issues.
Thank you all in advance,
NickNS
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Beolab Penta MK1
24 replies
Perhaps the crossover filter needs a recap. Since the sound is not great regardless of using the amps or not, it points to either the crossover filter or the mid foams IMO. The placement and distance to walls can also affect the sound.
Location: Copenhagen
I assume that you didn't have the opportunity to audition them before purchase. On the off chance that you did, do they sound different now?
Bad sound Penta?... and we did not talk about the amp. Just the box.
- Dead mids
- misaligned refoamed Mids
- blocked mids
- scratching mids
- wrong wirement of the mids, reversed, + = - ?
- wires not marked during rework... and you have a very nice day
- there are only 5 of 8 orange wires on the mids, which one is the right one???
- dead tweeter
- burnt tweeter resistor
- dead tweeter cap
- wrong recap of the crossovers, bad material
- recap is not recap, sometimes recap is badcap... good material out, worse material in
- broken coils in the crossover...
Hi everyone, Thank you once again for taking the time to help me with this. Here are the results after taking midrange board off one of the speakers. First I checked polarisation with voltmeter, it was correct on two drivers and incorrect on other two. Disregarding polarisation at this point, the real result is this - when connected to Penta, neither one of midrange drivers is working at all. When connected directly to the amp, all four work as they should. Tweeter works fine when connected to speaker. So, I suppose the issue has to be somewhere in the tower. If you have any further suggestions on my next step, I'm here to listen :) NickNSIf you have no sound from the mids that means your mids has been wired the wrong way. Sometimes only 1 driver produces sound. There are 2 sets consisting of 2 drivers. Each set are in series. The first set are the outer ones. These 2 are in series. 1 orange wire goes from the (+) to the (-) on the other side. Then the 2 middle drivers are in series. Again one (+) connected with the other one (-) with a orange lead. The blue and orange leads are connected correctly. The orange wires which goes down the tower can be interchanged without problems. These 2 end both at the same junction at the board. If wiring is correctly done but you still have hardly any sound from them (outer 2 drivers deliver less sound than the 2 middle ones due to the filtering on the board), then check L3 on PCB 15. It happens that these are burned.Location: Utrecht
Quite a challenge to achieve "Less is More" while having the Beovirus.Ok, I'll try what you said. It's still possible that they were incorrectly wired after re-foaming.Please Log In to Reply
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