Tuning my system towards a darker tone


I am trying to tune my system in a darker direction; as I have a bright ( lots of glass) listening area and have been directed by my interior designer ( aka wife) not to add room treatments.  Starting with power cords, then possibly ICs would like to find a natural sounding power cord but with a darker tone.  System includes: leben cs 600 amplifier, Linn Akurate Streamer DAC, Feikert Volare TT, Luxman CD player.  Current power cords include Luna, Audio Art and Raven.  Note: my speaker cables are not in play as they are within the walls and were picked to appease building codes in our area.  My price range for cord 500-1000.
MP

rivinyl
There’s a 1m pair of Acoustic Zen Matrix Reference ICs (original version) on eBay for $229.  Very warm sounding but still nicely detailed so may help push you in the right direction for not much $.  Cardas Golden Cross would be another IC to look at.  Best of luck. 
Just use EQ via DSP. Don't be stubborn. Every recording you own has been EQ to some extent. It is a valid tool except in the audiophile community. Download REW and buy a Mic, and you will never look back.
@erik_squires 

Maybe they should not cross at all. They could point straight across the room.

I asked because I have the similarly designed O/96's and they sound terrible pointed straight out.  In my room they sound best with the tweeters crossing right at the listening position which is how John DeVore suggests as a starting point when adjusting toe-in.  Even opened just a little bit loses a lot of sound quality/soundstage in my room.  I thought you were suggesting some form of extreme toe-in which piqued my curiosity as I had never tried that before - until this evening.  Nope, that degrades sound as well so back to the way I had it.
Well, really depends. Going only on the measurements, it does seem you can reduce the treble quite a bit by using the toe-in.

Obviously, don't make them suck. :)
If you decide to experiment with cables,research Triode Wire Labs. Their power cables are very effective (especially with digital) at taming aggressive high frequencies. Thirty day audition period to return if they don't work out for you.
Thick drapes and fine tuning the speaker positions as others have mentioned will help.