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Frequency response problem

post #1 of 12
10/30/12 at 10:35am
Thread Starter 

I noticed that my sennheiser HD580's left channel lacks bass. I've tried testing it with a mono sine wave oscillator and found

that left channel is very weak under 300Hz. Maybe oxidized parts causing such problem?

Thank you for your help in advance.

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post #2 of 12
10/30/12 at 10:41am
Quote:
Originally Posted by angevoi View Post

I noticed that my sennheiser HD580's left channel lacks bass. I've tried testing it with a mono sine wave oscillator and found

that left channel is very weak under 300Hz. Maybe oxidized parts causing such problem?

Thank you for your help in advance.

 

Swap the cable input so that your left is now inputting to the right, rule out the cable first.

 

Very best,

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post #3 of 12
10/30/12 at 10:44am
Thread Starter 

I've tried swapping the cables, made no difference. ( the plug must be oxidized inside or maybe the driver is damaged, i hope it does not.... )


Edited by angevoi - 10/30/12 at 10:46am
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post #4 of 12
10/30/12 at 10:46am
Quote:
Originally Posted by angevoi View Post

I've tried swapping the cables, made no difference.

 

Have you opened it up and looked at the solder joints? Might be weakened or cracked.

 

Very best,

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post #5 of 12
10/30/12 at 10:52am
Thread Starter 

I disassembled , tried to scour the metal part with some toothpicks. The copper wires between the plug and the driver are so thin, i couldn't diagnose anything on them..

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post #6 of 12
10/30/12 at 11:16am
Thread Starter 

But the main question is, can oxidization cause such problem on various frequencies?

I thought the whole channel should sound quieter or make cracking noise..

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post #7 of 12
10/30/12 at 11:45am
Thread Starter 

If the copper wires or plugs are oxidized, what can i use to clean them? Alcohol?

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post #8 of 12
10/30/12 at 1:51pm

Sure you've ruled out the pads?

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post #9 of 12
10/30/12 at 3:43pm
Thread Starter 

Of course, i've compared the drivers took out from the housing and found one driver must be damaged.

Frequency response is not just missing parts but totally messed up, gets loud on specific volumes.

One channel sounds linear to my ears but i don't like such doubtful cases.. i'll send this can back if i can.

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post #10 of 12
11/16/12 at 2:20am
Thread Starter 

HD580 imbalance

 

I got my headphones used, defected left channel. Those drivers had white layers in the capsule.

I ordered one from sennheiser and the new driver had black layer.

I'm not sure how all versions are identical.

 

Left Channel: old, driver, i'm not sure if it is old, new version or even HD600. On the sennheiser box, the date is 1998.

 

Right Channel: right, new driver (HD580)

 

The difference is small but noticable with ears

Is this acceptable and usual?

 

 

(and i replaced only the drivers, used identical left and right capsules)

 

1000

I repeated this measurement and got the same results

 

So these drivers are mixed up, i'm not sure what kind of differences are in versions.

I'll end this calvary with sending my whole headphone to sennheiser.

 

 

 

One more notice: My left channel looks similar to Headrooms HD600' measurement:

 

My microphones are cheap ones, but differences are still evident..


Edited by angevoi - 11/16/12 at 2:31am
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post #11 of 12
11/16/12 at 5:21am

Looks like typical Sennheiser driver matching to me. Hard to say without seeing the dB values on the graph.

 

Also, might want to get rid of the smoothing on the graph.

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post #12 of 12
11/16/12 at 10:11am
Thread Starter 
The thin lines are showing 2dB difference. I'll get rid of smoothing as I get home.
I'm not sure if I should order one more driver.. Maybe not if this is typical
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