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Old 12-31-2003, 10:10 PM   #1
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Car audio know-it-alls: what is a non-fade output?

Okay, so I finally got my Nakamichi HU installed - I gave up and took it to a specialist in the area. It works, most importantly, and they didn't mess up the stereo or dent the car so I'm happy. But I noticed the sound from the factory sub is no longer the same, the stock factory head unit produced ONLY low frequency sound from the sub, whereas now I can hear mid-range sounds leaking into the sub's sound.

The work order says the installer wired the sub to a non-fade output on the deck. So, what exactly does that mean? Is there a practical way for me to "filter" out the higher-frequency sounds from the factory sub? Sorry this is probably painfully obvious to most but me not know much about car audio...


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Old 12-31-2003, 10:19 PM   #2
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A non-fade output is an output that cannot be faded to either the front or the rear. Most sub outputs from an HU are non-fading.
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Old 01-01-2004, 12:09 AM   #3
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Okay, well that makes sense then. What I don't understand now is the "leaking" of the higher-frequency sounds. If the sub is hooked up to the sub output on the HU, shouldn't it be "filtered" so that only frequencies low enough for the sub are going to it?
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Old 01-01-2004, 02:08 AM   #4
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It may be a full frequency output. Or, the installer may have bypassed the crossover in the sub. Where is the crossover for the factory sub ?
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Old 01-01-2004, 02:22 AM   #5
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Quote:
Originally posted by guerro
Where is the crossover for the factory sub ?
I don't know. I suspect that it was (is) built into the factory HU. The Nak HU has a dedicated sub output, but maybe the installer didn't connect to that... Some day when I have more money I'll probably just go back and replace the stock sub anyway.
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Old 01-01-2004, 02:55 AM   #6
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Well, the sub isnt going to last long playing full frequencies. Might be okay as long as you dont turn it up to high.
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Old 01-01-2004, 01:29 PM   #7
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you could put fmods on the rca's if the hu or amp has no crossover

http://www.partsexpress.com/pe/showd..._ID=6766&DID=7

i'm not familiar with the factory sub but i think it has rcas going to the amp, otherwise you could use other 2-way crossovers on partsexpress.com, playing frequencies over 120 hz is generaly harmful to the sub so it's something you definately need to get fixed.

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Old 01-01-2004, 04:18 PM   #8
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Quote:
Originally posted by sa_pyro_ne
playing frequencies over 120 hz is generaly harmful to the sub
Why would this be harmful to the sub?

It would only use up extra power and not sound right.
Playing lower frequencies in tweeters could be harmful though!


The stock head unit's sub out is extremely filtered from higher frequencies, so the stock sub amp probably has no filter for highs and relies on the head unit for it.

Maybe the Nakamichi deck's crossover is adjustable, check the manual.
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Old 01-01-2004, 10:21 PM   #9
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playing higher frequencies than the sub can play is very harmful actualy. the frequncies it can't play are "used up" by giving it off as heat on the voice coils which can fry them, also, more distortion is created when playing those frequncies around 140 that are border-line that it can sort of play, and distortion creates heat, that why you should never play a sub over 120hz.

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Old 01-01-2004, 10:53 PM   #10
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Huh. Sounds like I might want to fix that soon then. I had already started looking at the F-Mods, I think that would do the trick. Is there anything else that I could use to do the job, like instead of an inline crossover? The sub out cord is RCA, but I can't see the end of it, so I don't know if they cut the RCA plugs off to tap into the wires or what - the factory sub connector was (is) most definitely not an RCA connection. I don't think the deck has any kind of crossover or filter built into it?
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