Fritz Heiler of southern California has been building custom loudspeaker systems for 37 years. Called into action at CAS 2010 were his Carbon 7s ($1750/pair shipped, or $1650/pair for show attendees who acted in time). Equipped with ScanSpeak drivers, these babies have a frequency response of 39Hz–20kHz, ±3dB, and a sensitivity of 88dB. Their special crossover is free of caps and resistors, having only one small inductor on the mid/bass driver.

In a system whose associated components include vintage Krell and Luxman gear, the speakers did a fine job of conveying air and pace. Given that the only room treatment in this bass-mangling small room consisted of towels on the sidewall mirrors, it's no wonder that the sound was boomy on bottom. If the show returns to the Hilton next year, I expect exhibitors will bring a fortune of room treatment.

Johnny B. Good's picture

"Their special crossover is free of caps and resistors, having only one small inductor on the mid/bass driver."Better ask JA about that...

John Atkinson's picture

It's more likely an inductor in parallel with the tweeter, I would have thought.

Johnny B. Good's picture


Jason Victor Serinus's picture

I've just asked John (Fritz) Heller to comment and clarify.

Fritz Heiler's picture

I'm using series crossovers in most of my designs now. I prefer to use paper based & poly cone mid/bass drivers with simple first order slopes. The mid/bass drivers that I choose have real smooth roll offs and do not have the large peaks & dips that most metal or hard coned drivers have which require many crossover parts to control & eliminate. My Carbon 7 model series crossovers do not have any capacitors or resistors in line with the tweeter circuit & John, you are correct, there's an inductor in parallel with the tweeter.BTW- This first CA Audio show was absolutely fantastic! My room was pretty well packed most of the time. I have a blast doing these shows & would like to thank everyone who came into my room to check out my loudspeakers. I would also like to thank Constantine & Sue for putting this together. I'm looking forward to doing many more here.