i came across an interesting article in an old Audiocraft mag (Sept 1958) and wondered if anyone ever tried this?it's basically a three band tone control
Nope, never heard of Audiocraft or of the WorldRadioHistory.Com, so thanks for a whole 'new' mags 'library' to browse! 
😀
AUDIOCRAFT: Do it yourself Hi FI publication from 1955
GM
😀AUDIOCRAFT: Do it yourself Hi FI publication from 1955
GM
- looks like it would be fun to take some coils, caps, and jumpers for a try. What inexpensive might one use for the variable resistors ? (I had a little stack of Audiocraft) - wonder if the mid circuit was used on some vintage FR ? There's a dial on EV's old SP15 fullrange
https://external-content.duckduckgo...id=OIP.CsPCr99UweyAotT_ltreHAHaDh&pid=Api&f=1
https://external-content.duckduckgo...id=OIP.CsPCr99UweyAotT_ltreHAHaDh&pid=Api&f=1
Last edited:
yeah i guess that could be a draw back, attenuators that is, if one was looking to do this at high power couldn't one use standard pots to find the tonal balance needed then replace them with high wattage fixed resistors?
the author of the article does say that there's an efficiency penalty but if it succeeds in making a "mid" fi fullrange more listenable then why not?
the author of the article does say that there's an efficiency penalty but if it succeeds in making a "mid" fi fullrange more listenable then why not?
It did back in the day when bass, treble tone controls was you're only option if you didn't have 'deep pockets' for Altec or similar studio mixing boards.
GM
Why not indeed! Speakers are already so inefficient that a few ohms for much improved tonal balance is a small price to pay in a typical modest SPL app.
Yes, I use[d] super cheap equivalents to the later Radio Shack's 25 ohm pot to dial in speakers in room, develop filters, then replaced them with Ohmite industry standard wire wound power resistors,'tapping' them as required same as Altec did in some of their autoformer XOs before being bought out: Wire Wound Resistor - Wirewound Power Resistor | Ohmite Mfg Co
There's always Ohmite high power [up to 1kW] rheostats: Rheostats - Ohmite Mfg Co
That said, sonically better to create a resistor 'bank' of small, low tolerance ['precision'/~MIL spec] resistors sufficient to get the desired ohms, power handling or just use their 'audio gold' series: Audio Gold Resistors | Ohmite Mfg Co
GM
Last edited: