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Old 09-01-2004, 08:49 AM   #1
BRH
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Default sound quality of Audiovox PNP2?(high end distortion problem)

I have a question about the sound quality of the Audiovox Plug n Play2. I have a 2002 Infiniti G20 and am using the PNP2 with Fm modulator. On certain streams (especially the Beat 66), I get a high end distortion sound on "s" or "hiss" type sounds (any high pitched vocals or words with a prominant "s" sound). I am wondering if it is due to my radio and speakers, the Audiovox units sound quality itself, or the Fm modulator? I previously had one of the first generation Kenwood modulated units in a previous car and didn't notice this problem with it. My Infiniti has the factory Bose radio and Bose speakers (which I don't think are all they are cracked up to be. The Bose speakers may be my problem as they don't sound that great on the high end range.)
Anyway, any ideas or suggestions? I tried using a cassette adapter instead of the modulator once and the sound was low and horrible. However, I read that the brand of the cassette adapter makes a big difference, and I think I just bought the cheaper Memorex one. Should I buy the Sony and try this again? Also, I kind of like the Bose radio but may consider changing the speakers. Would this help? Or is this high pitched distortion an inherant problem with the Audiovox unit itself, as I didn't notice it with the old Kenwood one?
Thanks in advance for your help, and any information or opinions will be greatly appreciated. I really like the convenience of the plug n play radio, and would prefer not to have to install a new radio and direct unit if there is anyway to improve the sound quality of what I have. Also, does anyone here have any experience with the Infiniti G20 or any of the Infiniti Bose stereo systems? If so what are your opinions and what would you reccomend as far as speakers or better sound? Thanks again.
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Old 09-01-2004, 07:56 PM   #2
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I had this problem sporadically with my pnp2/fm mod. There are several threads which claim that you can solve this problem by turning down the audio level out (prevents over-modulation) on the pnp2. I did this and have since not heard the "sssss".
The audio level out control is in one of the menus. I would try that first if you haven't already.

Good luck
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Old 09-02-2004, 11:07 PM   #3
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I have this same problem on an Audi A6 with Bose. I tried using the fm mod, cassette, and direct wiring into the stereo with the Blitzsafe adapater. All show significant distortion, but with direct wiring it is slightly less painful.

I already tried lowering the audio level output in the menu to its lowest setting, which improved, but did not solve the problem. Anyone have other ideas?
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Old 09-03-2004, 07:45 AM   #4
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I am still not having any success with getting rid of the problem. I just don't care for the Bose speaker system at all, and I feel I will probably end up changing and getting rid of the Bose speakers. I may keep the Bose radio but the speakers are definately not up to the quality of good aftermarket speakers from brands like Infinity and JBL.
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Old 09-04-2004, 05:33 PM   #5
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I've been reading various posts on the AudiWorld forums (http://www.audiworld.com) and others have experienced similar distortion problems.

I seem to have the ground loop isolator problem (a slight noise from the 12 volt power system), and the distortion because of too high volume. I looked at RadioShack online and found an attenuator for reducing output volume:

http://www.radioshack.com/product.as...t%5Fid=42-2559

I'll try that and report back. It won't be a 100% cure -- even with CDs, the Bose system fatigues my ears on long drives -- but I hope it improves.
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Old 09-04-2004, 06:41 PM   #6
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Slightly off topic, but Bose simply has a name. Their marketing is rediculous but people remember the name. They know the name and therefore associate it with quality. Please. Bose in my house? Never. I use B&W speakers. Bose in my car? Only if the car I really wanted came with them. I wouldn't put them in there by choice. Boston Accoustics, JBL, Infinity....heck, Alpine and Sony speakers are better sounding and longer lasting than the plastic speakers Bose makes. Cheaper too.
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Old 09-05-2004, 11:08 AM   #7
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Quick update. I just bought one of the Sony cassette adapters and the sound quality of the PNP2 is 100 percent better than with the FM modulator. Granted, the Bose speakers are still not up to my liking (my previous vehicle had Infiniti 3 way speakers and they sounded much better), but the Sony cassette adapter improved the sound quality dramatically and got rid of most of the upper end distortion that I had been experiencing with the FM modulator. I had previously purchased a cheaper RCA cassette adapter and it sounded horrible, so I didn't think the Sony would be any better, but to my surprise it made all the difference in the world. I'd definately reccomend paying the extra 10 bucks and getting the Sony adapter, as it sounds just like a hard wired system to me. (pretty much the same as CD quality. The RCA was nowhere near it).
So I'm very happy now. The adapter took care of most of the high end distortion problem and, of course, it also completely eliminated the static and hiss that is always a problem with an FM modulator.
I may still replace the Bose speakers for even better sound, but at least for now the quality is 100 percent improved.
My only worry with replacing speakers is that the Bose system has seperate tweeters that are mounted in the trim near the windshield and I'm not sure if I can get replacement speakers with seperate tweeters that will fit where those are or not. Any ideas?
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Old 09-05-2004, 11:15 AM   #8
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look at crutchfileds site and use the vehicle selector to see if they have any recommendations. Or just call them, they're by far the most helpful people I've ever dealt with.
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Old 09-05-2004, 12:57 PM   #9
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sound quality of Audiovox PNP2?(high end distortion problem)
 
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BRH, I agree with you. If you are going to go the Cassette Adaptor route, just make sure you buy a good one. There are many cheap ones on the market, but they sound like crap. If you pay the extra bucks, you'll end up with better SQ. Glad that it worked out that way for you.
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Old 02-03-2005, 08:47 PM   #10
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Default fixed my high end distortion problem ...

I have a PNP2 in my Pathfinder w/ BOSE audio. Have had it connected for about year via a Sony cassette adapter. I've always had a problem with distortion on high notes and talk channels. I've always thought it was related to the high volume signal coming out of the PNP2. Even with the menu audio out setting on it's lowest, it's still very loud on 8 or 10 for my stereo where CDs and radio are loud at 18 or 20. So, I went out and bought the Radio Shack volume control cable suggested in this thread (http://www.radioshack.com/product.as...t%5Fid=42-2559). What a difference! I have it outputting less than half the level it was before and the sound quality is definitely better. I think the high level output was overwhelming my cassette adapter. Thanks for the tip as9h2n, I hope this will help others too ...
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Old 02-04-2005, 12:53 PM   #11
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Default volume control cable

You learn something every day here! I was just reading about the volume attenuator cable here and looked into it further. I'm also using the Sony cassette adapter and have been happy with it. However at one point I thought I had damaged my speakers and was actually looking into replacing them. I was noticing the cracking and distortion talked about here, especially when (actually only when) listening to Jim Breuer or any other talk on Raw Dog. But then the other day I was listening via the FM modulator and realized I wasn't hearing it (the crackling). I also realized that when I'm cranking a CD, the sound is perfect. Clean, crisp highs and good bass. So the speakers are fine. I had always noticed that when I switched from FM mod to cassette that I had to lower the volume because the cassette was WAY louder than the FM. Now I think the attenuator is the answer. I will be able to balance the FM and cassette output, and hopefully lose the over modulation. I'm thinking the overall performance of the sound from the cassette adapter will improve. Will report back.

By the way, thanks for the tip as9h2n.
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Old 02-05-2005, 04:23 PM   #12
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Default flllow up: volume cable results

Ok, I picked up the volume cable from Radio Shack (they label it "Volume Control - Headphone Extension Cord). Hooked it up in the parking lot, and tested it. It completely eliminated the hiss/crackling on the talk stations and I was able to equalize the FM and cassette output levels. Overall sound quality (including music) was improved as expected. Definitely worth the 7 bucks if you're experiencing the cassette adapter over modulation.

Hookup is simple. It plugs into the audio out from the cradle, then the casette adapter plugs into the other end.
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Old 02-06-2005, 06:41 PM   #13
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Quote:
Originally Posted by BRH
My only worry with replacing speakers is that the Bose system has seperate tweeters that are mounted in the trim near the windshield and I'm not sure if I can get replacement speakers with seperate tweeters that will fit where those are or not. Any ideas?
Those are component speakers, and Crutchfield does have a good selection, and you can plug in the car you have and it will tell you what will fit.


Ken
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Old 03-14-2005, 01:14 PM   #14
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I just wanted to chime in here as another Bose stereo owner, and say that the Sony cassette adapter made my static go away(as expected), but introduced the crackle that others have mentioned. For me, I was able to eliminate the crackle by turning the audio output on my JVC KT-SR2000 PnP down to the minimum setting. All better now, although I'm still stuck with the "Bose sound". Oh well, can't have everything. It came with the car(99.5 Audi A4), and I love the car, so I tolerate the Bose.
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