Brisso57 Posted April 13, 2010 Posted April 13, 2010 I (for one) have a number of pairs of vintage drivers for which I have no reliable T/S data, nor freq response data. I’m also curious to observe the process of measuring drivers to produce that data. If it’s feasible to do so, I’d like to propose that we hold a speaker measurement GTG in Brisbane in the near future. (No preferred date in mind.) Participants would be invited to bring along drivers to be tested. From what I’ve read I believe that - whilst access to an anechoic chamber is required for “gold standard†measurement – it is possible to get usable results without one. I gather that what’s needed would include: 1. A tone generator or a PC/software/soundcard; and 2. A suitable microphone & stand; and 3. A speaker-mounting jig 4. Software or an Excel spreadsheet to crunch the data So … Is anybody interested in taking part? Can anyone offer their expertise? Does anyone have any suitable equipment? Does the whole idea seem even feasible? Doug
Green Wagon Posted April 18, 2010 Posted April 18, 2010 Bass drivers are very easy to measure. For basic T/S parameters all you need is a good amp, freq generator, a resistor, and multi meter. I have all these and live very close to you brisso. Same suburb in fact So depending on where and when, I'm in.
Brisso57 Posted April 19, 2010 Author Posted April 19, 2010 Thanks Green wagon. I think it may take a little while to gather enough interest, but I'm keen to proceed. I'd like to measure full range drivers, as well as bass, but I'm sure anything will be of general interest. * I have a Yamaha M70 (class A) amp which should fit the bill nicely. I also have recently purchased a DMM that does L & C and freq. What's needed in terms of mounting the driver for test? thanks & cheers Doug
Green Wagon Posted April 19, 2010 Posted April 19, 2010 The method i use needs no baffle. I just hang the driver mid air, and so far the results are spot on.. Sposed to be for bass drivers, havent treid it on smaller ones. It will only give you the T/S. but for a bass driver thats all you need for modeling. I have, fluke 179, aem6000 (amp flat to ~5hz from memory), and digital generator that goes from 0.1hz to 200khz (?). As we both live in the same suburb, we could do a mini meet maybe.
Brisso57 Posted April 19, 2010 Author Posted April 19, 2010 How quiet does the environment have to be? Doug
Green Wagon Posted April 19, 2010 Posted April 19, 2010 (edited) doesnt matter at all, as there is no microphone used, its all done by voltages at different frequencies. EDIT; this is what i use ----> http://sound.westhost.com/tsp.htm Edited April 19, 2010 by green wagon
Brisso57 Posted April 19, 2010 Author Posted April 19, 2010 doesnt matter at all, as there is no microphone used, its all done by voltages at different frequencies.EDIT; this is what i use ----> http://sound.westhost.com/tsp.htm OK. Thanks for that. I'll read it carefully and digest. Doug
Brisso57 Posted April 22, 2010 Author Posted April 22, 2010 doesnt matter at all, as there is no microphone used, its all done by voltages at different frequencies.EDIT; this is what i use ----> http://sound.westhost.com/tsp.htm Well I got busy the other night and I now have test boxes for 100mm (4") and 300mm (12") drivers. I'll cut some packing pieces of MDF so I can utilise the 12" box for 8" as well. Doug
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