Speaker specifications are technical details that describe the capabilities and characteristics of a speaker. These specifications can help you determine if a particular speaker is suitable for your needs. Some common speaker specifications to consider include:

* Frequency response: The range of frequencies (measured in Hz) that the speaker can reproduce. A wider frequency response means that the speaker can produce a greater range of sounds, from deep bass to high treble.
* Sensitivity: A measure of how loud a speaker will be at a given power level. A speaker with high sensitivity will be louder than a speaker with low sensitivity at the same power level.
* Impedance: The electrical resistance of the speaker, measured in ohms. Matching the impedance of the speaker to the output of your amplifier is important to ensure that the speaker receives the correct amount of power.
* Power handling: The maximum amount of power (measured in watts) that a speaker can handle. It's important to match the power handling of the speaker to the output of your amplifier to avoid damaging the speaker.

When selecting speakers for your build, it's important to consider your intended use and the capabilities of the speakers. For example, if you want to use the speakers for home theater, you'll want to look for speakers with a wide frequency response and high sensitivity. If you're building a car audio system, you'll want to consider the size and power handling of the speakers to ensure that they can handle the demands of in-car use.