Post by jacobamerritt on May 21, 2019 21:21:57 GMT -6
I absolutely LOVE the SoundToys Sie-Q... Maybe my favorite shaping/character EQ ever. The Siemens W295b its based on is extremely old and expensive for actual hardware. Does anyone know if there is another 'modern' EQ unit that has a similar vibe? I'd pay for that. Any ideas audioscape , Locomotive Audio , rocinante , EmRR ?
Looking at the schematic it is not dissimilar to a how a 1073 works. It has four parts:
Input transformer feeding a three transistor buffer, RC low and high shelving filters, followed by an L-R//C high pass filter (DR1) and then an inductor peaking mid band. These are separated by two four transistor discrete gain blocks. I suspect most of the tone would be in the iron. I could back into the mid band inductor tap values from the schematic, unless someone has taken one apart and measured it.
All in all, not too complicated. I could make a PCB for it if you wanted to DIY. Or I can make you a custom one.
The Bax portion is very simple - the most expensive part to "do it right" would be the switches. On the cheap, you could use pots.
The individual transistor gain blocks are not complicated, but the original transistors are unobtainium.
Same for the original iron. Out of curiosity, I called Cinemag and they haven't made them, or have any info on them...input, output, or the two inductors.
On the other hand, you could "interpret" the schematic. Maybe use a balanced amp for the input, then go discrete with the closest modern equivalent transistors. Use the original Q and frequency points, but change the other passives to use an off the shelf inductor, if possible. And use an off-the-shelf output transformer. It wouldn't be a clone, but the truth is a bax high and low tone control plus an inductor mid is going to sound cool no matter what active components you wrap around it. My opinion, anyway.
I did a 1RU pcb for it, now endeavoring to translate it to a a 500 series pcb layout. It’ll be interesting trying to get everything to fit. The hard part for the 500 series will be finding an appropriate output transformer that can fit (600:600 gapped).
This could be really cool. I, too, like the Sie-Q. Would be awesome to have something like it available in hardware.
It makes total sense though. Software educates the ear to hardware that's inaccessible to most of us. Then when things reach critical mass talented builders work to recreate (in some degree) a hardware version for today's hybrid studios. It's the circle of life!
i don’t so much mean a piece of hardware to “emulate” the software Soundtoys has come up with. I more mean a piece of hardware that closely follows the hardware that the software is based upon. I have little doubt that the hardware would sound better than the software.