Bottlehead Forum

Bottlehead Kits => Crack => Topic started by: TonyBo on October 04, 2010, 03:52:23 AM

Title: Crack with AKG K701
Post by: TonyBo on October 04, 2010, 03:52:23 AM

Did anybody try Crack & Speedball with AKG K701?

K701 has a bit low impedance of 62Ohms. That with 160uF
coupling capacitor gives a bit high cut off of 16Hz.

TIA,

Tony

Title: Re: Crack with AKG K701
Post by: Doc B. on October 04, 2010, 05:12:35 AM

A 16Hz cutoff is plenty low. The problem in these situations with Crack and lower impedance headphones is not the bass extension, it's the less than optimal impedance match that creates a softer, looser bass. I'd suggest using a 5998 tube in place of the 6080 to get the Crack output impedance down a bit lower than stock. That should help a bit.

Title: Re: Crack with AKG K701
Post by: TonyBo on October 04, 2010, 05:16:25 AM

Thanks, Doc.

Tony

Title: Re: Crack with AKG K701
Post by: ironbut on October 04, 2010, 06:37:08 AM

I tried the stock Crack with my 701's and Doc's right. Not an ideal match. Actually, I've tried them on a number of tube amps and their inefficiency plus the lowish impedance seems to require a pretty hefty amp. The Melos preamp/headamp and the Singlepower XLR-SDS make them sound pretty darn good but in the end, they just weren't my cup of tea.
Real comfy though.