LV 720 too soft sound performance

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Harmony
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LV 720 too soft sound performance

#1 Beitrag von Harmony » 20.04.2022, 19:19

I have do have a little problem with my LV720 speaker.

After a repair of my LV720 this speaker box sounds too soft.

On my CSQ 1020 the pegel must put up more than 12 dB, so there is a very disbalance in sound reproduction without manual adaption on the amplifier.
Or I must turn the pegel to the maximum level on the backside of the LV speaker.

What could be the reason for this problem? Is there a technical way to adjust the right level of musical perfomance?

Greetings from Rotterdam
Braun for your own High-End

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raimund54
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Re: LV 720 too soft sound performance

#2 Beitrag von raimund54 » 20.04.2022, 20:59

Hello Joop,

if you connect both LVs to the same channe (e.g. both to the right channel), ist the diffence of loudness still there? If yes, problem is in the LV.

If not, if you press mono at the CSQ, does the difference then disappear?

Regards,

Raimund

Harmony
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Re: LV 720 too soft sound performance

#3 Beitrag von Harmony » 21.04.2022, 18:19

Yes, I have tried it both to the right channel and there is still a difference in loudness. The speaker have a too low sound production.

I have also tried it on the CES 1020 and the CSQ1020; the same result.

You have to adjust the pegel of the CSQ at almost to the maximum level (left or right) to get the correct balance. The pegel on the backside of the LV 720 is at 0.
On the Regie preciever there is less space to do that. Also the speaker Pegel button on the backside must put on the maximum level.

The sound of the speaker itself is good.

What to do to solve this technical problem?

Groeten, Joop
Braun for your own High-End

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raimund54
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Re: LV 720 too soft sound performance

#4 Beitrag von raimund54 » 21.04.2022, 19:32

Hello Joop,

then the problem is located in one of the LVs. Probably the first stage of preamplifier in one of the LVs is not working as it should.

You told me that someone replaced some parts like transistors in the LVs. Probably he made a mistake.

To find the problem you have to connect a adjustable (frequency) sine wave generator to the LVs and measure the level after the various circuits in the box or compare in both boxes.

Regards,

Raimund

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