Speaker Rake

Hi
I have a problem,I own a pair Talon Firebirds, I have been experimenting with speaker placement for a long time know, I have concrete floor with berber carpet, I find that they sound better with out their large spikes attached, a couple of weeks ago I notice that when you are standing up and I first press play and I return to my listening position and sit down you lose the very bottom end, I have experimented by placing a piece of carpet under the back, this seam to fix the difference in sound from standing to sitting, I then thought what would happen if I replace the spikes and adjust the rake, using the spikes, with the spike's attached I
find it's flat, should they be level or rake back or forward, I am at a lost.


to loose the midrange, today I played with the rate and sitting placement
of sitting position I found the further I lent forward the better it sounded but when I moved the seating position it was lost again!I read on another
post of people placing platforms under there speakers, I would think this would be a bad Idea as this not how the speaker would of been designed as I am finding in my case as the hight of the spikes seam to destroy the
sound, but in saying that mine design to use the spikes, sip
of been designed to be set at this hight and not at what they with spikes, I use a level to get the level and still wasn't happy, is it the rake?should forward or back.