How do i send signal from one mono amp to another?

Question

My alpine reciever has three sets of preamp outputs. Im using 4 for a 4 channel amp.

Answer 1

Assuming that you're trying to connect your deck's subwoofer output to two different subwoofer amps, there are two ways:

-Some amplifiers have pass-through RCA outputs for connecting additional amps. In this case you'd just run a short RCA cable from one amplifier to the next.

-You can use RCA Y-adapters to split the output to both amplifiers. Despite what some will tell you, this won't significantly lower the output voltage.

Answer 2

You need an electronic crossover.

The crossover, is connected before the amplifier and depending on what type you buy you can connect as many amps as you like.

In simple terms, a crossover is like a traffic cop for audio frequencies. It filters and directs frequencies to allow only a certain range of frequencies to reach a certain speaker. Frequencies outside that range are attenuated or blocked.

Every system needs a crossover of some type. How sophisticated a crossover you need depends on how elaborate a system you're planning. If you're running just a basic system with an in-dash receiver and four speakers, then you don't need to worry about buying a crossover. Your full-range speakers already have passive crossover networks built in between the woofers and tweeters. And if you're just driving full-range speakers with an external amp, the crossover network on the speakers should be fine.

When you start adding multiple amps or dedicating an amp to driving a specific type of speaker (like a subwoofer), that's when you'll need a more sophisticated crossover.

A high-pass filter allows only frequencies above a given point to pass through. A low-pass filter allows only frequencies lower than a given point to pass through. High- and low-pass filters can be used together to create what's called a "bandpass" that will allow a certain band or range of frequencies reach a speaker.

In a hypothetical car audio system the audio frequencies might be directed as follows:
Low frequencies (say 100 Hz and lower) go to subwoofers.
Midbass speakers get frequencies between 100 and 250 Hz.
Midrange speakers would see frequencies between 250 and 3,000 Hz.
All frequencies above 3,000 are handled by the tweeters.


Keep in mind that the points listed here are not set in stone and do not apply to every car out there. The best crossover points for one vehicle might not be the best for another. It all depends on the speakers being used and the acoustic properties of the car. Most electronic crossovers allow you to choose from several crossover points.
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