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Car Forum / Driving, Maintenance, Tuning / Car Audio / February 2005Need help with speakers hissing
Hi all, I need some help from all of you pro's out there. Long story short, I wanted to keep the factory head unit in my 04 Accord so I installed some AudioLink Line Level Converters and ran the RCA to the trunk. I hooked up one of RF amps and fired up the stereo and there is constant hissing coming from the speakers. There also seems to be a bigger than normal jump in the music volume from volume 0 to volume level 1. The hissing doesn't get any louder when I turn the volume up, it's just constant starting at volume level 1. I replaced the RCA's and amp to eliminate them as the cause and it still does it, also tried a new ground point. Very annoying. Is this the price I pay for wanting to keep the factory deck and use LLC's? Also, and this is very depressing to me, I just bought a Audio Control 6XS crossover that I was pretty excited about using and when I hooked it up, the hissing is now 5 times louder so I can't evn use my new toy. I realize that replacing the factory HU with my Alpine 7930 (stashed in my closet) will probably fix the problem but was wondering if there is any other fix for this. I really wanted to maintain the stock stereo. Thanks in advance for any responses. > Hi all, > I need some help from all of you pro's out there. Long story short, I [quoted text clipped - 14 lines] > this. I really wanted to maintain the stock stereo. Thanks in advance for > any responses. How are the gains set on the RF amp? If the gains are pegged, what you are describing is EXACTLY what would happen. MOSFET > > Hi all, > > I need some help from all of you pro's out there. Long story short, I [quoted text clipped - 23 lines] > > MOSFET That's not it, I know all about gains and how to adjust them. I have learned a few things in the last 20+ years of installing systems, but this one has me stumped. Thanks anyway have you tried a different loc and what kind are you using -- wideglide34 CarAudioForum.com - Usenet Gateway w/over one million posts online > That's not it, I know all about gains and how to adjust them. I have > learned a few things in the last 20+ years of installing systems, but this > one has me stumped. Thanks anyway Well don't get offended. You didn't mention the RF gains in your message so it WAS the obvious first area to investigate. I would conclude that your line-level converter is not doing it's job correctly (faulty unit, bad product fit with your application, etc.). Have you tried bypassing the converter (running the stock head directly into your amp)? MOSFET > > That's not it, I know all about gains and how to adjust them. I have > > learned a few things in the last 20+ years of installing systems, but this [quoted text clipped - 9 lines] > > MOSFET The amp does not have speaker level inputs, I wish it did. I could probably live with the hiss, at least for a little while, I just wish I could use my 6XS crossover without the hiss increasing. I wonder why the crossover would amplify the hiss? Maybe something is wrong with that also. Gotta love this stuff. I was thinking a bit more about your issue and something puzzles me. You implied that the hiss starts at volume level 1 and then stays constant. So if the volume is at 0, am I to assume there is no hiss? If this is the case, this is strange because I don't think Rockford amps employ noise gates (perhaps the newer ones do), therefore the hiss MUST be coming from your head unit (otherwise you would hear it at volume level 0). Therefore the hiss SHOULD increase as you increase the volume. Hmmm. Maybe you are using a newer Rockford amp that does employ a noise gate. Anyway, some of these symptoms don't add up. Tricky. MOSFET > I was thinking a bit more about your issue and something puzzles me. You > implied that the hiss starts at volume level 1 and then stays constant. So [quoted text clipped - 8 lines] > > MOSFET There is no hiss at 0. The amp I have is the Punch 4080 that I purchased around 1995ish. I did not have this problem in my last car using the same amp but with my Alpine 7930 deck. I'm considering blowing the dust of the Alpine and hook it up, but would really like to keep the factory look on the dash. I just finished hooking up my old crossover, a Sony XEC-1000 and it did not amplify the hiss like my new Audio Control 6XS does, I wonder if there is a problem with the 6XS. I bought it online and it would probably be a major headache to return or exchange it. Try turning down the gain in the converters and/or the amp. The "bigger than normal jump" is a sure indicator that either the converter or the amp (or both) has the gain up too high. That or you should try a different converter. A certain level of hiss is unavoidable (in my experience, anyway) when using converters; but, with proper system tuning, can be made tolerable, if not completely acceptable. > Hi all, > I need some help from all of you pro's out there. Long story short, I [quoted text clipped - 14 lines] > this. I really wanted to maintain the stock stereo. Thanks in advance for > any responses. |
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