sony components

I have a Sony demo car and the Rep. is trying to get me to upgrade to a new set of components. I haven't heard them and am concerned about ordering them and it being a mistake. They are the XS-HF137 and are an aluminum cone. I don't have much experience setting timing and controling resonance from aluminum cone mid-drivers. Has anyone heard this speaker and if so any personal ratings on them would be appreciated. Sony does not provide much info on them.

Thanks,

David Fancher

For show and demo. Yes, Sony gives me Full-ride. Took 4th palce in SQ pro at USACi world finals this year in Kansas city  with the $69 entry line pair in my pods. I have a choice; i just don't have a lot of experience with aluminum cones. Hoping to hear some advice about controling reverbiration with aluminum mid-drivers.

Thanks

David

Aluminum is an interesting cone material to use.  Although it does offer great stiffness for it's weight, it has a problem with resonating at higher frequencies.  And these resonances can't be removed with processing as they are usually excited by motor nonlinearities.  They just won't go away no matter how steep the crossover or how much equalization you apply.  If you are competing in SQ, then you don't want any of your equipment adding unwanted noise to the system.  If you have to use them, I suppose you could dampen the cones somehow.  That may reduce the problem some.

Thanks Steven. I will toy with some sort of dampening and see what I can accomplish.

Thhanks to all for the insight,

DAvid