where would you put a dimmer switch on an audio amplifying circuit?

Question

in case the sound comes out too loud when i build the circuit and equipt it i want to be able to control the sound
where would i put the dimmer switch

Answer 1

First off the previous answers are wrong. Yes, dimmers (normally called potentiometers, rheostats, or variable resistors) aren't just for lighting control. They're an everyday component in zillions of ELECTRICAL circuits. What they physically look like is of no consequence.
Secondly, yes, most are placed internally but, that's not a hard and fast rule. Some are internal and any knob on the outside of any audio component is usually a potentiometer (whether moveable vertically, horizontally, or turnable) (volume, balance, graphic equalization, etc.)

Put one wire (-) from the output jacks straight to the speaker, put the other wire (+) to the center post of the dimmer and connect another (new wire, preferablly the same kind/size speaker wire) wire to either other empty post of the dimmer. (which post will determine which direction the knob controls the volume)
Now run the wires (the one straight from the output and the other from the dimmer to your speaker. The one that goes across the dimmer will control the resistance in the circuit and thus the volume. The volume can now be controlled.
Ref1 is dimmer controls.
Ref2 is circuit design (zigzag w/arrow is dimmer) Red is positive and blue is negative even though there's more speakers and dude forgot to draw blue line to connect other speakers to ground, it'll still work for you. It's the same theory, just fewer speakers.
Easy enough?

Answer 2

I think you mean a level control, not a dimmer switch. Usually level controls are placed internally between amplification stages. The reason is that level contols reduce the signal levels, so you need some amplification ahead of them so they are acting on high-level signals. The controls are potentiometers, and several connections are possible. One way is to use the potentiometer as the collector resistor in a stage and feed the next stage from the wiper of the potentiometer. Such connections must be AC-coupled (series capacitor in the wiper lead) and the input impedance of the following stage must be high (perhaps an emtter-follower). The level control could also be a variable resistor in the emitter of a standard common-emitter gain stage.

NOTE: You cannot use an ordinary potentiometer in a speaker circuit. You will find that you will either get full volume or no volume. Speaker circuits are low-imepedance circuits, and the iput and output impedance must be maintained independent of volume setting. There are special controls that can be used to control the volume of an individual speaker in a system, they are called "L-pads", and are designed for 4-ohm, 8-ohm or 16-ohm speakers. They will work, but you need one for each speaker.

Answer 3

Say what? A dimmer switch is for lights, not amplifiers.