Thank you if you like it
The spikes was made on CNC from stainless steel.Each ob have below footprint a ceramic square (500mm x 500mm) and 15mm thick print support with 3mm absorber material below to not scratch the floor.
The front baffle is from 45mm MDF + oak veneer + more than 16 coats of lacquer hand maded.
After that ... some serious work with 2000 granulation of sand paper & cold water + car polish (very fine one) and some teflon oil to make that shine look.All of the work-hand maded,manually.
The crossover for Supravox is on 250hz passive (single cap) and for Alpha's is active one.I also experimented with supertweeter Fostex T925A alnico motor on the top.The integration was wery good but not an "must be".Today I don't need any kind of supertweeter extension.Supravox do that job very good indeed.
The detail on Supra is amaizing and not need aditional components to mud the sound.
The amplifier for Alpha's is also DIY with lateral mosfets and for Supra DIY tube monoblocks.
The entire system is fire up with DIY preamp.
I will try passive cross. to woofers....12-15H coil to see what is happening.Any suggestions?
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I have experimented a few days ago with Paudio BM8CXA (8" coaxial) and with 3 tweeters:
The passive cross on them was on 1,1khz IV and I order on 6khz.
Also I tryed I order on 8" woofer.
The results don't satisfy me.The sound is very mud,lack of details and overall was far away from Supravox.
Another experiment these days was replacing the Supra with Altec 811 horn + 806 driver.The cuttoff was on aprox. 800-900hz...original crossover.
The maximum sensitivity on Altec is about the same with Supravox...96-97db.
The details on Altec was a little soft and silky and a few steps back, somewhere close to the wall.
The feeling on Supravox was "right in my face" the vocalist was "here..here with me".Allmost I touch the instruments.Microdetails was there.
The single "weak link" on the Supravox was when I go up the volume.. ...aprox. 45W ...(on 96db spl)...the sound became ugly agglomerate,harsh and unpleasant....but on 30W is amaizing.
96db and 30W is more than enough for most "normal" people.
On jazz or classic music the instruments on Altec horns was something on the back seats comparing with Supra on the baffle but very easy listening on higher volume.
I change 806 with Selenium 220TI,2500Ti-neodimium and BMD450-S ferofluid from PAudio.
The 2500 is a little dark,220TI something dull and 450 in between...
All these drivers have the mark -"metal inside"- was not my cup of tea ,something still missing comparing with Supravox.I don't tryed the drivers on other horns.
Comparing face to face,the ob's side by side that was my impression.I know the conclusion maybe was too early and probabily have some phase problems but I couldn't make them sound coherent.
Have a nice night between the 2008-2009.