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Bavarian Soundwerks' Mobile Electronics Forum
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Old 04-23-2003, 08:13 AM   #1
Frank Rizzo
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JL Amps = Balanced signals?

Has anyone here hooked the factory HU outputs directly to a JL amp that accepts the balanced input signals? I'm thinking one less component in the signal path (no converter) can only help - I'd just like to know that it actually works...

Thanks
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Old 04-24-2003, 12:26 AM   #2
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Yes, the JL amps accept the BMW headunit inputs directly, i.e., you don't need a line output converter.
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Old 03-09-2004, 07:22 PM   #3
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How 'bout an Alpine 540?
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Old 03-09-2004, 10:01 PM   #4
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I don't believe so, but not 100% sure. I can tell you that my Alpine MRV-T420 does NOT accept balanced differential/speaker-level inputs. You can look at at amp's specs and if it's input range is 2V or below, it only accepts unbalanced inputs (i.e., you need an LOC).
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Old 03-10-2004, 05:21 PM   #5
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Xtant amps also accept Balanced line inputs. They can handle up to 17v.
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Old 03-10-2004, 08:36 PM   #6
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Is there an input voltage adjustment on amps that accept balanced?
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Old 03-14-2004, 08:24 PM   #7
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Yes, there's input gain sensitivity on amps that accept balanced inputs. The manufacturer doesn't know if you're going to feed it a balanced signal, an unbalanced signal, and whether it's coming from a factory headunit, an aftermarket headunit, speaker-level inputs, etc.
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Old 03-17-2004, 09:25 AM   #8
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Quote:
Originally Posted by johnhab
Yes, there's input gain sensitivity on amps that accept balanced inputs. The manufacturer doesn't know if you're going to feed it a balanced signal, an unbalanced signal, and whether it's coming from a factory headunit, an aftermarket headunit, speaker-level inputs, etc.
How does it sound using a stock HU to an amp versus using a aftermarket deck with like 4v pre-outs? Is there a noticeable difference?
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Old 03-19-2004, 10:56 PM   #9
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Quote:
Originally Posted by rkj082000
How does it sound using a stock HU to an amp versus using a aftermarket deck with like 4v pre-outs? Is there a noticeable difference?
I really can't answer that, as I'm using my aftermarket amp to drive a set of JL Stealthboxes, so I'm only hearing the lower frequencies. I also have navigation so I don't plan to switch out my headunit.

Hopefully someone else that did an amp upgrade with the stock headunit then later switched out for an aftermarket head unit could give you some insight into the sound difference. However, it's going to greatly depend on the headunit, the amp being used, the aftermarket speakers being used, etc.
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Old 03-20-2004, 02:25 PM   #10
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If you hook it up right, and adjust the VEN4 properly, there should be very little difference between the sound of the stock hu and an afteremarket when listening to CD. You might be able to get better FM/AM reception from an aftermarket but I'm not sure about that.
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Old 03-20-2004, 02:50 PM   #11
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If you hook it up right, and adjust the VEN4 properly, there should be very little difference between the sound of the stock hu and an afteremarket when listening to CD. You might be able to get better FM/AM reception from an aftermarket but I'm not sure about that.
If you have a HK navigation unit, you're almost certainly going to have better reception with an aftermarket unit, unless you buy a piece sh!t. That's why I got an XM receiver...
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