Integrated amplifiers, understanding tone control

I would like you to help me with this question, maybe it's kind of stupid, but I have a hard time understanding, an integrated amplifier says that its tone controls boost or attenuate +/- 10dB at certain frequencies, those dB, are they gain or attenuation of power?, voltages ?, how would the account be if in the chain, an equalizer appears later that contributes its +/-12dB in the event that the frequencies coincide?
 
That is a voltage gain or loss, with +10dB as a gain, and with -10dB as a loss.

If there is also an equalizer in the system, the gain or loss will add or subtract in dB.
If the tone is + 4dB, and the eq is + 7dB, the total gain is +11dB.
However, too much tone and/or eq gain can cause clipping and distortion.
 
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