Bridging basically means combining two channels of an amplifier to produce an increased effect referred to as a mono signal that is output on one channel amplifier. Bridging an amplifier not only increases the power sent to each amplifier, it also enables one decrease the number of channels used semi-partially.
Before going ahead with the process, one must be sure of several things:
i. The amplifier is capable of handling bridging. This has to be indicated by the manufacturer on the equipments surface or the manual it came in. Otherwise, one may research the model online to find out if it can be bridged. If not, one should not attempt to do so as it may already be bridged on the inside.
ii. To know whether the amplifier has rejected the bridging, it begins to cycle on and off and to take care of this have it operate in stereo rather than bridge mode.
iii. One must put into consideration the minimum load an amplifier can handle and should not force, for example a 4 ohm load on each channel to drive a 4 ohm mono load.
iv. Test to see if the amplifier has already been bridged by measuring the voltage between the negative speaker output and the cars ground. This of course is done after turning off the amplifier. A zero output indicates it has already been bridged and thus no further attempt should be considered for the same.
On a car with a two channel amplifier, there are normally four terminals .On each channel there is a positive and negative terminal. To avoid getting confused, one must label each of the wire terminals; for example, channel one, name the positive terminal A and the negative one B. For the second channel, name the positive terminal C and the negative counterpart D.
It is noticed that on the speaker there is a ridged wire that is black in color and unribbed one red in color. Now having labeled the four channel terminals, one must carefully fix the red speaker wire to the channel one terminal A. After connecting them, join the black speaker wire to channel two's terminal D. And that ends the bridging process for a two channel amplifier car.
However, some cars have a four channel amplifier which may be a bit technical compared to the two channel counterpart. In this type of amplifier, there are eight terminals Channel one, two three and four each of which like the two channel amplifier has a negative and positive terminal. Label them appropriately as describe above in that you have terminal A, B, C, D, E, F, G and H.
Carefully connect the red speaker wire to terminal A of channel one. Note that this is the positive terminal. Subsequently, fix the black speaker wire to terminal D (negative). Now connect the amplifier to the second speaker by fixing the red speaker wire to terminal E and then join the black speaker wire to terminal H.
In order to bridge a car amplifier, one has to know the terminals and channels and in case of confusion consult professional help.
Note however that bridging may not be the best idea if;
i. One does not need the extra power.
ii. The extra channels may be useful for other purposes.
iii. The amplifier is not stable enough to handle bridging.
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