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Old 25th July 2013, 02:17 AM   #1
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Default Unbalanced vocals

Greetings!

I have a pair of 3 way hybrid horn speakers which I put together myself.
It consists of a jbl 2402h for the highs, jbl2446h on jbl2380 horns for the mids and an eminence alpha 15 in a sealed enclosure for the lows.

Due to the difference in the efficiency of the drivers, I have padded the mids and highs down with an individual fixed l-pad attenuating 15db. My crossover is a 2nd order crossover with the crossover points being 800hz and 5khz.

My problem here is as my title states, unbalanced vocals. Even on mono signals, I have observed the vocals to seem to be louder on the left.
I have eliminated the following components in my system : ( pre and power amps ,audio source , crossovers and my ears.) as the cause of the phenomenon.

I am however suspecting phase issuees. As I am unsure if the diaphraghms are installed in correct phase. (How do I check for this?)

Another thing to note would be that the dcr of my drivers are all correct according to their spec sheet.

One other question I have would the 'resolution' of this speaker system be low? As I have listened to Chris Jones' "Roadhouses and automobiles" and I could barely hear the crickets.

Thank you in advance!
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Old 25th July 2013, 02:57 AM   #2
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Reverse connection for mid (one side or where it's low) and test again. (That's the easy way... it's a good idea to check!). Else, something in the crossover might not be working/connected well.
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Old 25th July 2013, 03:00 AM   #3
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Quote:
Beginning in the early 1990s, JBL began an orderly
transition to the positive-to-red standard in accor-
dance with practices recommended by the AES,
EIA, IEC, and other standards organizations.
Polarity Conventions - JBL Professional

Last edited by Inductor; 25th July 2013 at 03:03 AM. Reason: JBL convert to the “positive-to-red” standard
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Old 25th July 2013, 01:02 PM   #4
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Hello Inductor !

Thank you for replying!
I have tried changing the phase this way and other on my mids as well as the other drivers in the system. However the condition still persists.
the crossover is unlikely to be the fault as I have tried swapping the speakers connected to the crossovers .
Could the diaphragm be faulty despite having an ideal dcr?
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Old 25th July 2013, 01:50 PM   #5
bwaslo is offline bwaslo  United States
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A voice coil could be frozen (warped, uncentered, or othewise stuck in the gap), would make it not play while still having DCR. Try swapping HF and/or MF drivers between sides to see if the weak side follows one of them.

As far as "resolution", it is more likely to be a response shape problem. Using generic crossovers with drivers (particularly with horns) is almost sure to never be very flat. The crossover should be designed with the drivers and all their related curves and delays, otherwise there are likely to be cancellations and other bad response effects.

Last edited by bwaslo; 25th July 2013 at 01:52 PM.
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Old 25th July 2013, 02:40 PM   #6
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Quote:
Originally Posted by Quartz19208 View Post
My problem here is as my title states, unbalanced vocals. Even on mono signals, I have observed the vocals to seem to be louder on the left. I have eliminated the following components in my system : ( pre ....
Hello Quartz

If you're not using a Stepped Attenuator in your preamp, the problem can be in your volume control. The normal Stereo Log pots do not have very good tracking on both channels. It can vary by as much as 6dB.

Quote:
One other question I have would the 'resolution' of this speaker system be low? As I have listened to Chris Jones' "Roadhouses and automobiles" and I could barely hear the crickets.
You'll need to have some kind of measurement equipment like OmniMic, to plot the frequency response. The highs could be rolling off. It could also be our hearing. As we age, we lose the high frequencies. As it is, our ears are not linear ( see Munson & Fletcher )

Regards
Mike
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Old 25th July 2013, 03:44 PM   #7
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Hello bwaslo!

Thanks for your reply!
I have indeed swapped the sides and the weak side follows. Thus I have concluded that it is indeed a problem with the 2446 on the right. Could there be any potential problems with such a driver besides a damaged diaphragm? E.G weakened magnets or shifted pole-piece and such? Although I strongly doubt either being my issue due to the driver being handled with much love and care all this while.

Regarding the 'resolution', I guess I will have to get myself an active crossover.
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Old 25th July 2013, 03:51 PM   #8
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Hello Michael Chua!

Thanks for your reply!
Yes I am indeed using a stepped attenuator in my main preamp and have tried with other preamps and amps.

Indeed I do have to measure my speakers. Have been wanting to do so since I built them around a year ago however I never got around to purchasing the equipment required.
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Old 25th July 2013, 04:04 PM   #9
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I just recalled that the foam in the back plate of the left(louder) 2446 have degraded into dust. would that be the reason for my problem?
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Old 25th July 2013, 06:25 PM   #10
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Default Room acoustics

Have you tried physically switching the two speakers so as to rule out any room acoustics issue?
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