line out converter gain control
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=120572
Printed Date: May 14, 2024 at 11:55 PM
Topic: line out converter gain control
Posted By: zoomzilla
Subject: line out converter gain control
Date Posted: March 07, 2010 at 1:32 PM
I did a search, but did not feel I got my question answered. So here is my deal. I have a 2004 Dodge Ram QC with the RB4 factory nav system. I am in the process of installing a new amp and speakers, but want to keep the factory HU. So I bought a Scosche 4 channel LOC. I will be running it into an Alpine PDX-5. My question is in regards to the gain on the LOC. I will need to tie into the speaker outs from the HU due to the built in crossovers in the factory Infinity system. The truck was born with the 7 speaker factory infinity system. So anyway, the wiring is quite simple, 8 wires into the LOC, I get that part, but it also has a gain adjustment for the 4 channels. How would I want to adjust the gain on the LOC? I could read voltage with a multi meter, but not sure what would be optimal for my setup. All responses are greatly appreciated.
Replies:
Posted By: Velocity Motors
Date Posted: March 07, 2010 at 5:31 PM
Read what the MAX input levels are for the amplifier and match that. If it has a 2 volt MAX input signal, then that is what you should dial in for the LOC.
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Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
Posted By: zoomzilla
Date Posted: March 10, 2010 at 10:41 PM
Ok, one more question. My rear doors should are full range, so that will not be an issue, but the front doors are components, so would it be an issue to hook up the front door and the dash speaker wires to make a full range front? If this does not work, then I can going to scrap the whole thing and just buy an aftermarket head.
Posted By: ianarian
Date Posted: March 10, 2010 at 11:45 PM
Keep the factor head unit! Keep the navigation. On the front stage- Due to the rear speaker location the sound can easily conflict the front if not tuned right. We started with Focal components in the front and were not pleased with the results. After switching out the front door speakers with some high end Memphis 2-way's and leaving the tweets in the dash, satisfaction was achieved. Now, taking apart the dash to get the tweets in is not something I'd recommend. We used the tweets since they were already there after the components were installed. Now, to end confusion, a custom tweet install in the front door, or simply a full range speaker may be your best op. Beyond that, the dash tweets help balance the sound in the front seats with the rear speakers. Furthermore, I really like the added tweet sound from the dash, PERSONALLY! So, Im not sure of your qualification, if you'd like, I'd be happy to discuss or hear your method for assigning the proper L+R+F+R orientation from the head unit to the line converter.
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This is what I do for FUN!
Posted By: scosche
Date Posted: March 17, 2010 at 4:57 PM
Greetings,
If the vehicle is factory amplified (often-times); the wire that is present behind the factory stereo is Signal-wire and not Speaker-wire.
Connecting a High-to-low converter to signal wire will result in no-audio or low-audio output.
I recommend that the high to low converter be connected to the speakers wires that are located between the OEM amplifier and the OEM speakers.
As you correctly stated, the OEM amplifier features a built in crossover, and so it critical that the speaker wires that are being connected to (lets say factory Woofers), eventually connect to the appropriate input channels on the aftermarket amplifier (Subwoofer input channels).
As for setting gain levels on the High-to-Low;
- First raise the volume on the Head unit to its maximum Un-Distorted level (usually around 80%)
- Then begin raising the gain levels on the High-to-Low until background noise becomes noticeable and then reduce until the noise is adequately reduced.
- Finally, raise the Amplifier gain level until background noise becomes noticeable and then reduce until the noise is adequately reduced.
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