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Step 7The amplifiers
For the total of 7 speakers I use 3 amplifiers. One for the bass, one for the mids and one for the tweeters. Since the bass uses the most power, it's recommandeble to give the bass the amplifier with the highest output.
I use car amplifiers because they are already set for working on a 12V battery.
Installing the amps:
Put a little strip of rubber between the the amp and the wood, then screw the amp to the speaker box. It's now a little shock proof.
Connection the amps:
You need to drill some holes in the speaker box, for each amp 3 holes for power, and in each box 2 holes for your line input. I also put a "threw" in one of the boxes (2 holes).
The power connection from a 12V amplifier contains three switches, a GND, a RMT and a +12V:
-The GND is the GROUND and is supposed to be connected to the - on the battery.
-The RMT is the REMOTE, this is supposed to be the switch that turns the amp on and off. You can use a actual switch here, I didn't use a switch. I switch it in manual by connecting it on and off the 12V battery. The RMT is supposed to be connected to the + on the battery. (Note: if the RMT doesn't get power, the amp doesn't work, because it's "off")
-The +12V is supposed to be connected to the + on the 12V battery
For the line-in, the amps have a tulp connection. Since I go from one source to three amps I needed to split the signal. I therefore used 2 X "2x tulp female to 2x tulp male / 2x tulp female".
Use the speaker connection from the amp to connect your speakers. If you only connect 1 speaker to each amplifier you can use the bridged connection. If you use more than one speaker try to use equal speakers. Don't connect three or five, always try to equalize the output. Best just don't use more than two speakers directly for each amp. Except when the amp has more outputs.
I use car amplifiers because they are already set for working on a 12V battery.
Installing the amps:
Put a little strip of rubber between the the amp and the wood, then screw the amp to the speaker box. It's now a little shock proof.
Connection the amps:
You need to drill some holes in the speaker box, for each amp 3 holes for power, and in each box 2 holes for your line input. I also put a "threw" in one of the boxes (2 holes).
The power connection from a 12V amplifier contains three switches, a GND, a RMT and a +12V:
-The GND is the GROUND and is supposed to be connected to the - on the battery.
-The RMT is the REMOTE, this is supposed to be the switch that turns the amp on and off. You can use a actual switch here, I didn't use a switch. I switch it in manual by connecting it on and off the 12V battery. The RMT is supposed to be connected to the + on the battery. (Note: if the RMT doesn't get power, the amp doesn't work, because it's "off")
-The +12V is supposed to be connected to the + on the 12V battery
For the line-in, the amps have a tulp connection. Since I go from one source to three amps I needed to split the signal. I therefore used 2 X "2x tulp female to 2x tulp male / 2x tulp female".
Use the speaker connection from the amp to connect your speakers. If you only connect 1 speaker to each amplifier you can use the bridged connection. If you use more than one speaker try to use equal speakers. Don't connect three or five, always try to equalize the output. Best just don't use more than two speakers directly for each amp. Except when the amp has more outputs.
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