Thiel Owners

Meanwhile, back in 3.5 land....
So I collected the components from the parted out 3.5 from our Long Island friend (thanks again, btw!) and I'm ready to ship the mids to Rob for a rebuild.  So my question (TomThiel), would there be any value to redirecting the rebuilt mids (Scanspeak 13M/8351) to you or someone who could map the frequency curve to compare with published frequency curves of the two most popular Scanspeak replacements?  The idea is to find the closest (understanding that it won't be a perfect match) to the original for those 3.5 owners that may have received a pair of 3.5s where the original mids have long departed (which was the situation I was in).  Also included in my haul were the original crossovers, tweets and woofers.  I'm hoping to help out the community a bit here, let me know what I can do.

Bluetone - Yes, it would be instructive and helpful for me to test those midranges as a baseline reference standard. Since I don't have an anechoic chamber, my curves will not match the other published curves, but it will be a step toward progress. The rest of the parts can wait; I am really not ready to take on the 3.5 as a project. Please send a PM to exchange shipping information. Thank you.

I have ordered some test equipment to do some measurements of the mids of my 3.5 and will compare the specs to some alternative drivers. I'm interested in tri-amping each speaker with digital active cross overs and incorporate fir and peq  filters for equalization, as many of the eq of the 3.5 have become repair prone. It's a different approach then the original, but I'm just curious about the pros and cons of this adaptation. Still researching this area but it looks promising.

Rules - Go for it! I mentioned way back that Jim's first focus and indeed we built early prototypes of active speakers. At that time the market would not accept the concept; now, the time has come. There are many details to tame. I hope that you stick with first order slopes to get time coincident and phase coherent output. 

Please share your driver rig and results. Get your primary curve from free air mounting in a large wall - infinite baffle.

A huge pro of the active approach is taking the guesswork out of cables and amp responses, along with lower cost of low power crossover components.

Keep us informed, please.

Tom, thanks for the encouragement. Infinite baffle, is that doable with 8x8 wall. As I have a farm and can do outside measurements, been looking for some scaffolding. How high?