Trying to sharpen the vocals...EQ related question

Hi,

Looking for some clarity on the following:

-Current Setup-
Technics 1200mk2
Sonus Blue Gold Cartridge/Needle
Yaqin MS-12B MM Tube Amp (Stock tubes)
Marantz SR-8000 Receiver
Bose Acoustimass 6 Series III SS Speakers

Really enjoying listening to vinyl, this setup produces great sound for the money. Highs and lows are crisp and clear, but the vocals often seem somewhat muted or flat. They lack the same crispness and clarity.

If I wanted to try to pull the vocals out a bit more, would running a 10-band graphic equalizer between the pre-amp and the receiver enable me to do this? Or does the pre-amps' hard-coded equalization curve already adjust the signal such that the additional eq would be redundant and ineffective?

Thanks for your help.