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Balanced inputs into 'normal' amplifier?
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10-06-2012, 03:56 AM | #1 |
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Balanced inputs into 'normal' amplifier?
Anyone help with this? I'm tying myself in knots
With the base HU recoded to HiFi, the outputs are balanced, low level. However, very few amps claim to accept balanced signals, and the ones that do are relatively pricey. So, assuming the coding is done: 1. What will happen if I just fit RCA plugs onto the end of the speaker wires and connect them to A.N.Other amp? 2. What would happen if I get something like the Autoleads PC1-601 Line Output Convertor which grounds the signal and connect that? or 3. Do I need to suck up the cost and either buy the expensive amp, or buy a DSP and forget the HiFi coding? Sigh.
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Last edited by parapaul; 10-06-2012 at 04:03 AM.. |
10-06-2012, 05:03 AM | #2 | |
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For my own, and anyone else's info, I found this article:
Quote:
I understand a lot of what that article says, and it looks like it's going to be a case of trial & error to get it right. Luckily I have an oscilloscope so it will be relatively scientific. 1. Fit RCA plugs to the speaker wires, and firstly see what the output is like without any modification of the signal. I don't expect that to work, because the amp will expect a 0V signal the the RCA sleeve, not an inverted copy of the +ve signal. 2. The article differentiates between tying either the -ve signal to input ground, or connecting the input ground to output ground. In car audio, everything is grounded to the chassis anyway so I'm hoping that it won't matter but I'll try it and see.
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Last edited by parapaul; 10-06-2012 at 05:31 AM.. |
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10-06-2012, 07:35 AM | #3 | |
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See my response in bold.
Quote:
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10-06-2012, 02:07 PM | #4 |
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makkan00, i take your point and agree that re-coding would be better than DSP, but a re-code cost a fortune by a dealer (and a lot still get i wrong) and trying to find an independent is near impossible whilst purchasing a DSP off ebay is easier on the wallet and arrives in the post.
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10-06-2012, 03:18 PM | #5 | |
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Quote:
See coding sticky thread in the main UK thread and see who is closer to you.
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10-06-2012, 03:26 PM | #6 |
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B.W I have used VEN4 LOC to convert differential balance input to normal paul.
I have recently sold it to forum fellow member.
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10-07-2012, 03:40 AM | #8 |
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Makkan00, what a great sticky on coding, I had know idea there is that many member in the UK that can code.
I think I will be in the same position as Parapaul (post originator). Do you think adding a DSP (jl cleansweep) to a coded system will bring further benefits as mob17 suggest. Mob17: have you added DSP to a coded system? If so can you identify the benefits because I have the DSP but I'm now think of coding as well. I know a harness will simplify the fitting but will the harness need to be different if I code to hifi or leave as base and add a DSP. And how much do harnesses typically cost. I have thought about making a harness but cannot find any wiring diagrams for a BMW 335D E90 2007, does anyone have these details Sorry for the long post. |
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10-07-2012, 04:27 AM | #9 |
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What DSP do you have?
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10-07-2012, 07:21 AM | #11 |
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I read that earlier but am after exact model number.
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10-07-2012, 01:52 PM | #13 | |
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Quote:
A Cleansweep or BitOne or MS8 are like hen's teeth on ebay, and to buy new they're upwards of £300.
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10-07-2012, 02:56 PM | #14 |
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That should do the job. All the best.
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10-07-2012, 03:02 PM | #15 |
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I'm surprised that you have not contacted coders in your region / near your area.
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10-07-2012, 04:05 PM | #16 |
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None in my area, unless the thread's been updated in the last week or so.
The closest one is the Birmingham independent listed, and that was his quote.
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10-07-2012, 04:40 PM | #17 |
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If you get one more person in your area for hi-fi coding, I can pass by your area on my return from Manchester trip.
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10-07-2012, 04:54 PM | #18 |
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What is the input impedance of the power amp?
The cost of a balancing transformer (two required for stereo), is less than £10 each. If high z input is available, it's a cheap solution.... if you can solder some wires to RCA's one side and what ever is required the other. http://cpc.farnell.com/oep-oxford-el...2-2/dp/TF01454
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10-08-2012, 12:33 AM | #19 |
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BigBanana, I'm listening... How would I connect the transformers?
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10-08-2012, 04:42 AM | #20 |
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I remember fitting convertors for this 20 years ago whenh using a factory Ford Head unit (balance outputs) and connecting it to unbalanced input amps.
Something like this (2 needed): http://www.studiospares.com/di-boxes...FYXJtAodsigA0g |
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10-08-2012, 01:25 PM | #21 |
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Interestingly, I had a reply to a thread I started on Talk Audio. Someone suggested that the term 'balanced' on this situation doesn't actually mean balanced in the true audio sense, rather that it's just a flat EQ.
Going to do some testing with a scope and see what happens.
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10-08-2012, 03:44 PM | #22 |
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Yes, Balanced in these terms has nothing to do with audio or EQ, its a term to describe the signalling layout.
Using a balanced or earth free signal for audio in a car (or any electrically noisy environment) is going to give better result as the chassis/ground is full of horrible electrical noise and is not going to improve matters if it forms half the audio circuit. |
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