Nice to see someone dispelling the notion that Harbeths are rolled off, but they aren't inherently bright either. As Newbee suggests, sidewall reflections and toe-in are worth considering, as are ceiling reflections and hard furniture reflections.
The other thing I would point to is the speaker stand height. I have my 7's on 16 inch stands. When I tried them on 21 inch stands they took on a completley different tonal character, still Harbeth clear and precise, but the whole lower midrange and bass was down 1-2 dbs. So, I would say first experiment with stand height. If the tweeters are lower than your ears, tilt the speakers back just a tiny bit.
I am not familiar with your preamp or amps, but if the output impedance of the preamp is high compared to the input impedance of the amps, that could cause a loss in the bass, which could in turn have the subjective effect of emphasizing the treble. If the Manleys have some sort of adjustment, that would be worth a try.
Finally, if you are bi-wiring, put the shorting straps (jumpers) back in and see what you think.
Do not put Totem beaks or anything else on your speakers. Totem speakers are designed to be inert. Harbeths have lossy boxes designed to resonate with low amplitude at unobjectionable frequencies. You will change their sound by putting something on them to something not intended by their designer.
Good luck, and feel free to email me.
Paul
The other thing I would point to is the speaker stand height. I have my 7's on 16 inch stands. When I tried them on 21 inch stands they took on a completley different tonal character, still Harbeth clear and precise, but the whole lower midrange and bass was down 1-2 dbs. So, I would say first experiment with stand height. If the tweeters are lower than your ears, tilt the speakers back just a tiny bit.
I am not familiar with your preamp or amps, but if the output impedance of the preamp is high compared to the input impedance of the amps, that could cause a loss in the bass, which could in turn have the subjective effect of emphasizing the treble. If the Manleys have some sort of adjustment, that would be worth a try.
Finally, if you are bi-wiring, put the shorting straps (jumpers) back in and see what you think.
Do not put Totem beaks or anything else on your speakers. Totem speakers are designed to be inert. Harbeths have lossy boxes designed to resonate with low amplitude at unobjectionable frequencies. You will change their sound by putting something on them to something not intended by their designer.
Good luck, and feel free to email me.
Paul