AKG K-340 Phones w Dynamic/Electrostatic Drivers & JLH Chiara Class A Amplifier
Will Ship To: U.S. & Canada
I acquired these phones 3 yrs. ago. They came with the factory cable (it was made of stranded steel conductors; it measured 8 ohms total per driver). They sounded good but not great. After searching the forums I came up with a list of modifications; that were performed. They are as follows.
1. The plastic baffles that caused some acoustic anomalies had the center screen removed, leaving only the outer ring.
2. The wiring connecting the electrostatic drivers to the dynamic drivers was corrected.
3. The original rubber bands on each ear cup were replaced with substitutes as the originals are no longer available.
4. The cotton stuffing behind the dynamic drivers had become compacted with time & was replaced.
5. They were rewired with Canare Star Quad cable & a new connector.
6. The original pleather ear pads were discarded & new soft oval shaped pads were ordered from Israel; they provide much better fit & do not cause your head to sweat, very comfortable.
These are what is referred to by some as the bass heavy version. Actually the balance between the low & high end is very good. The dynamic drivers are gray in color. These mods. have turned an alright pair of phones into a great sounding set. The bass is right & tight & the high end is smooth, clean & clear.
I am driving them with a class A Chiara amplifier that was originally designed by British Design Engineer, John Linsley Hood. I purchased the printed circuit board from a dealer in the U.K. It is a solid state design that is neutral & very clean. When listening to classical, country or pop the original recording comes thru without having any color added by the amplifier. I did make several modifications to the circuit to eliminate distortion & increased current drive from the output stage, making it a perfect match for the K-340's. A 23 step attenuator replaced the original rotary volume control. The power supply is in its own case with an umbilical cable connecting to the amplifier chassis. There is no hum or hiss from the amp., it is dead quiet. The amplifier is mounted in a black anodized Lansing Metals case. The volume knob & headphone jack are mounted to the front panel with stereo line level gold RCA jacks at the rear.
These mods. took the original circuit from a decent class A output to a Rolls.
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Edited by Sewer Guy - 5/13/13 at 5:16pm