Problem here is original poster has taken an amplifier that is designed to receive “line level†audio signal and amplify it to a “speaker level†signal – then feed this into his disco’s aux line level input.
Put in simple terms, it’s like running a 110 volt lightbulb from a 240 volt supply – it will work, but probably not for long (and it will be exceptionally bright!)
Also, the amplifier used by poster looks to be pretty poor quality and any noise or hiss created by it will be further amplified by the disco head unit (plus it’s overloading the head unit’s input considerably!)
The only proper solution is to get an amplifier which takes what is nearly line level signal from the MP3 player and then brings the levels up slightly so the disco receives the right signal level.
I would recommend something like the RDA STA-1 dual channel line amp which has adjustable gain controls for both left and right channels – this is a professional product so unlikely to generate any audible noise. Full spec sheet at http://www.rdlnet.com/product.php?page=54
This model would require a power transformer to run as it needs a 24 volt DC supply.
What he says.Discovery 3 TDV6 5-Seat
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6th Dec 2007 12:21 pm
Alex08
Member Since: 09 Nov 2006
Location: Glasgow
Posts: 1600
I have recently got one of the Belkin iPod car adapters and this takes the line output of the iPod and feeds it through a variable amplifier. A 3.5mm jack out then allows this amplified audio signal to go into the AUX socket.
Others on here have mentioned this before, and it is really good. I'm very impressed with it. Obviously it is no use if you don't have an iPod, but it is less than £20 and a secondhand iPod isn't that much to buy. Well worth considering rather than building your own amp. Of course you could canabalise it and make your own input lead....
6th Dec 2007 12:44 pm
caverD3
Member Since: 02 Jul 2006
Location: Oberon, NSW
Posts: 6922
The system worked well, it had a volume control so the levels were not overcooked even on full volume there was no distortion just slightly abover the cd volume level.
I think he is right about the quality of the components used in it, it was cheap ($20) this is probably causing the noise I could not get rid of.
The problem with the unit he suggested is the power supply 24v rather than 12v. It is surprising no one makes an in-line car one for non i-pod as it is a common issue.
I have not had a chance to play with the ripping recently so I'll keep trying, I have managed to get the right volume and no distortion but file size is too high. I only have 2gb sd cards for the PDA as is doesn't take HC cards.
Maybe I'll have to put up with the volume difference but I will see how it goes with software first.“There are only three sports: bullfighting, motor racing, and mountaineering; all the rest are merely gamesâ€
Ernest Hemmingway
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