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Originally Posted by gunbir Most higher HU models have a dimmer wire which needs to be connected to your "parking lights" circuit. Eg the higher Pioneer HUs even let you set "day brightness" and "night brightness".
I dont think the 4750 has that feature. |
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Originally Posted by gunbir Aseem
They were discussing the 4750... so my comments were specific to that HU. Yes, the 7750 has very bright lights... they should fix that... |
I think you are contradicting yourself. You had posted about higher Pioneer models having "Dim" feature, and acknowledged that 4750 doesnt have that feature. Later you state you were discussing the 4750??? I had responded to your original post stating that the dim feature doesnt work that well in the Pioneer 7700 (So called higher model) and is very irritating as you cant dim the lights on the knobs using the dim feature as per customer reviews.
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Originally Posted by gunbir Aseem
When you say 2.2v is too less... how have you come to that conclusion. Please explain to me how much preamp voltage is enough for car audio... Cuz this preamp voltage thing is thrown about so often... and very few people understand it... |
I am sure you are the one of the few folks who understands it
, however below is my take on it.
Firstly I never said 2.2 V is
"too less", I said its a petty such an expensive unit doesnt come with 4 V pre-outs.
Here's what an amp does: it takes its input and makes it larger so it can drive speakers. How much larger it can make the input signal is set by the input sensitivity and the maximum power output of the amp. You can turn the input sensitivity all the way up but that does not make the amp put out more power than its max, it just gets to that max level with a smaller input voltage.To show the importance of why 4 V outputs on a head unit are better, lets consider an example. Lets say for example we 2 head units, model A puts out a 1 volt signal and model B puts out a 4 volt signal max. We're connecting these head units to a 25 watt amp. The amp puts out 10 volts.
Power = Voltage^2/Resistance = 10^2/4 = 25watts.
To get maximum output from head A, the gain needs to be 10 (10volts out per 1volt in, 10/1 = 10). Now let's say there's 0.1 volt of noise in the signal. With our gain set at 10 with our input sensitivity control we have amplified the noise to 1 volt. Consider what happens with head B. The gain needs to be only 2.5 to get full output. We still get 10 volts of output but the noise is only 0.25 volts. This noise level is 4 times lower than with head A. By using a higher voltage head unit you can set the gain on your amp lower and thus amplify less noise.