Post by thread:[Pic]:RE: Has this been done before? Speaker testi

Jan, No offense taken at all. I'am aware of the Qc,Qt,Fs figures. The optimum way to get these figures for a given speaker pair (For Matching) would be to take an actual impedance reading over a range of freqs and then calculate from the graph produced. There is quite a bit of variance amoung speakers, even if the same model. Steve. {Original Message removed}

On 26 Sep 2001 21:28:33 -0400, Kasm Consulting wrote: > Jan, > > No offense taken at all. > I'am aware of the Qc,Qt,Fs figures. > The optimum way to get these figures for a given > speaker pair (For Matching) would be to take an > actual impedance reading over a range of freqs and then > calculate from the graph produced. There is quite a bit > of variance amoung speakers, even if the same model. > Not that this particularly my field (he hides behind his CS academia!) but the way a colleague and I have done this in the past is to use an impulse noise spike (a maximum length sequence) and then capture this (with a calibrated mic) and do the FFT... We have an old bit of kit called the "IMP" which plugs into a PC parallel port which does all the noise/capture and then you can do your own thing and get all the Q's and impedance curves and response curves too... Just my $0.02 /Kevin -- Kevin J. Maciunas Net: spam_OUTkevinTakeThisOuTcs.adelaide.edu.au Dept. of Computer Science Ph : +61 8 8303 5845 University of Adelaide Fax: +61 8 8303 4366 Adelaide 5005 http://www.cs.adelaide.edu.au/~kevin SOUTH AUSTRALIA -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email .....listservKILLspam@spam@mitvma.mit.edu with SET PICList DIGEST in the body