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View Full Version : possible cause for tweeter 'hissing'?



whitemdx
08-11-2006, 11:32 AM
Finally got my system installed using an LOC instead of trying to spliced RCA's into the factory HU supposely 'low-level' signals.

I am quite happy with how the sound of the equipment. Only problem I noticed is that when I turn the volume on the HU (factory bose HU) all the way down, there is noticable 'hissing' or 'buzzing' noise coming out of both tweeters. When the volume is turned up, it blend in with the sound, so it really doesn't bother or affect the sound. Just curious what can be the problem? I am using a David Navone LOC and tapping into the speaker inputs for signal to the amp. Could that be it? No engine noise, just from the tweets. Thanks.

GrnEydDvl
08-11-2006, 05:23 PM
That LOC has a high voltage output IIRC.

I would set or reset your gains. With the 8 volts or so it is putting out you should not need to set the gain very high.

Setting your gains properly can help to reduce system noise. Simliarly, having your gains cranked will raise the noise floor and can cause hiss to be much more audible.

whitemdx
08-11-2006, 06:02 PM
Set the gains quickly last night by ears. Will use test tone and DMM later to verify. Thanks.

BTW, what does 'IIRC' stand for?

OCURIEL
08-11-2006, 06:02 PM
What ever happened the fb box you started?

GrnEydDvl
08-11-2006, 06:04 PM
BTW, what does 'IIRC' stand for?

IIRC = If I recall correctly

whitemdx
08-11-2006, 06:48 PM
What ever happened the fb box you started?

Got the fiberglass box completed a while back, just waiting for my equipment to be replaced. Everything is in working orders now! Will have pics later today.

DBfan187
08-11-2006, 06:50 PM
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=5638&highlight=Sibilance)
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=590&highlight=Sibilance)
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=7053&highlight=Sibilance)

squeak9798
08-11-2006, 07:43 PM
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=5638&highlight=Sibilance)
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=590&highlight=Sibilance)
http://www.audiogroupforum.com/csfor...ight=Sibilance (http://www.audiogroupforum.com/csforum/showthread.php?t=7053&highlight=Sibilance)

:read:

noob with an RS
08-11-2006, 08:50 PM
your gain is too high.[/thread]

DBfan187
08-16-2006, 10:47 PM
:read::crying:
Guys, the "hiss" is the noise floor.. and it's supposed to be buried in the S/N of the system. If you can hear the noise floor, then the system's gain structure is not up to your standards... Time to get a scope and test disc, and get things set correctly.

BTW, a wire cannot create a "hiss"... it's just a passive element... Hiss is not picked up in signal cables, or speaker wires, by any inductive processes I've ever seen.