I found my bass!! Reason why you may be unhappy with aftermarket audio system - Victory Forums - Victory Motorcycle Forum
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post #1 of 29 (permalink) Old 09-24-2015, 09:34 PM Thread Starter
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Default I found my bass!! Reason why you may be unhappy with aftermarket audio system

I did some more work on my system and just for fun I disconnected the front inputs and hooked the rear speaker inputs into my amp.

They only put out 1.5 volts at max power (29 on display) without clipping so I hooked them to the low level inputs on my amp reset the gains on my amp with the occliscope and DAM!!! there's all the bass I've been missing. There must be some kind of factory low frequency cutoff to keep you from blowing the stock front speakers.

1.5 volts is a pretty weak signal and I don't like having to run the stock radio at 25-28 to get a good signal so I ordered a
Audio Control - Overdrive Plus 2 channel line driver.
Its similar to a Line level converter but it cleans the signal then boosts it so you can feed your amp a good signal adjustable up to 9 volts!

I will receive it Saturday and let you know how it goes also installing the new Vtwin audio 6.5 adaptors and Polk Audio MM6501's looking forward to this!!!

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post #2 of 29 (permalink) Old 09-24-2015, 09:38 PM
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Interesting...looking to see how this turns out.

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post #3 of 29 (permalink) Old 09-24-2015, 10:23 PM
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Very interesting. If only we could get a better head unit for these things.
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post #4 of 29 (permalink) Old 09-25-2015, 07:05 AM Thread Starter
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Well if this goes the way I think it will now I think the Magnum radio/head unit is fantastic.

With the Oscilloscope I was seeing a much cleaner signal coming out of the rear (un amplified ) speaker harness than I was coming from the front amplified signal.

There was a dramatic diffrence in ( sound/bass/warmth ) even with the weak signal I was feeding my JL Audio xd400/4v2 but I had to have the volume turned up to 25+ to get a strong enough signal for the amp to recognize and the amp gains turned up to about 40%.

With the line driver I should be able to adjust it so that the amp gain is set to almost Zero giving me a cleaner signal and more dynamic output.

2012 Vision - in process of converting to Cross Country rear end and bags
Lloyd's -Filter-Timing wheel-Adjustable Intake-Throttle ring
PCV5
Home built 2 into 1 pipe with dummy pipe on left looks stock
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post #5 of 29 (permalink) Old 09-25-2015, 07:17 AM
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Quote:
Originally Posted by Travis P View Post
Very interesting. If only we could get a better head unit for these things.

You can!!!
ImageUploadedByMotorcycle1443183437.361251.jpg
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post #6 of 29 (permalink) Old 09-25-2015, 07:19 AM
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That would never work for me... I ride in rain too often. I think its cool as shit just wouldn't work for me.
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post #7 of 29 (permalink) Old 09-25-2015, 07:20 AM
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You can have it made with a waterproof cover
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post #8 of 29 (permalink) Old 09-25-2015, 07:20 AM
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My stereo PUMPS.
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post #9 of 29 (permalink) Old 09-25-2015, 08:07 AM
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I'm sure you did...but sometimes the obvious question should be asked. Did you consider the fade setting on the factory stereo? Is it, perhaps, faded to the front - causing the rear signal to be diminished?

Just throwing it out there. There's no logical reason why the rear line level would be any less than the front...not that I can think of.

Next question. Isn't the gain on the after market amp just an op amp, on the input side, which would serve the same purpose as the Overdrive Plus 2?

I'm not familiar with the Magnum system. You said you were tapping into the rear unamplified harness. Does the Magnum factory system have line level outputs so that folks can hook up to line level inputs on aftermarket amps? If so, that's cool. I've always wished the XC did.

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post #10 of 29 (permalink) Old 09-25-2015, 09:22 AM Thread Starter
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First off I'm not an Audo pro or a know it all!!
Im just a dumb redneck that likes to learn and research things and do everything my self. Just passing along my findings.

No I have the fader is set equal front to rear. I will be moving it fully to the rear today and re measure it to see if it helps increase the signal output to the rear.

The Magnum head unit is only amplified on the front channels. To use the rear speakers you have to buy the rear saddle bag amplifier that mounts under the rear fender.

You are correct in theory about the amp gain. The problem I'm seeing on the Oscilloscope is that the signal is so weak (playing a 1k test tone) that I only get a slightly useable input signal to the amp when I get to about 25 on the volume.
My amplifier requires at least a (low of 200mv - 8v high) signal to work. Most quality aftermarket head units put out 5-8 volts cheaper ones only about 2v there is just a huge sound quality with the higher voltage.

No unfortunately there is no RCA's ( low level ) coming out of the stock head unit. Just the rear unamplified signal which in theory is the same thing if I solder RCA's onto the speaker wire, it is just too weak of a signal to propperly feed the amp hence the need for the line driver.

I think all Victory bikes work this way? The only amplified signal is the front speakers if you add a trunk or saddle bag speakers you have to purchase there little amp for the rear. The CC Tour comes with this secondary amp installed already. So with the rear signal you are getting an unfiltered unprocessed clean signal it's just too weak to propperly drive the amp to its full power cleanly!

2012 Vision - in process of converting to Cross Country rear end and bags
Lloyd's -Filter-Timing wheel-Adjustable Intake-Throttle ring
PCV5
Home built 2 into 1 pipe with dummy pipe on left looks stock
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