It could be a 2 channel stereo amplifier.
A mono amplifier. You need two for stereo.
Yes you can bridge this amplifier to a 2 channel at 4 ohm per channel for 200 watts out of each channel.
2
The Kicker 4-channel Car amp has the Kicker logo on it.
a channel refers to the speakers or subs. for example a 2 channel amp can power 2 subs or speakers. a 4 channel will power 4.
For the most part yes. However an injector (assuming I know what you are reffering to) is typically used to insert a signal into an existing coax feed (EXAMPLE: when your VCR plays a movie on channel 3 when you can still watch channel 6). While an amplifier simply increases the power of a signal. Good Luck.
Connecting speaker leads to both right outputs, A&B, will only play the right channel of the sound (in mono) when both pairs of speakers, A and B are turned on. This won't damage the amplifier or speakers, but you won't be listening in stereo.
90 watts X 4 channel output
You can determine the impedance (ohms) of a car amplifier by checking the specifications provided by the manufacturer. Look for information on the minimum stable impedance the amplifier can handle per channel. If it can handle 2 ohms per channel, then it is a 2-ohm amplifier. If it can handle 4 ohms per channel, then it is a 4-ohm amplifier. Typically, this information is found in the technical specifications or manual of the amplifier.
One can find a four channel car amplifier from many different stores. These stores include Best Buy, Walmart, K-Mart, or any store that sells electronics.
One can purchase a 4 channel amplifier from any local music supply store as well as some local department stores. One can also purchase these from online retailers such as Amazon.