- Written by John E. Johnson, Jr.
- Published on 25 August 2008
Klipsch P-39F Speakers On the Bench
At 50 Hz, THD+N was 2.7%. I measured this at 1 foot from the center woofer.
At 1 kHz, measured from the midrange driver, distortion was a very low 0.4%.
And, at 10 kHz, measured from the tweeter, 0.5%.
Room response, measured at 2 meters, is shown below. The bump between 60 Hz and 80 Hz is a room effect. The response is flat between 600 Hz and 20 kHz. The response below 600 Hz is a little lower than the response above 600 Hz (the crossover frequency between the midrange driver and woofers is 500 Hz). I suspect this is due to the more focused transmission of the sound from the horn-loaded midrange driver and tweeter, as compared to the conventional woofer cone drivers, and that I tested the speakers quite a way in from any walls. The tri-wiring capability would really come in handy here by simply driving the midrange and tweeter together, and a second power amplifier for the woofers. Then the low frequencies could be raised to be in line with the rest of the room response.
The impedance dips down to 3 Ohms between 100 and 400 Hz, but then stays beetween 8 Ohms and 16 Ohms from 900 Hz to 20 kHz. The electrical phase stays between ± 600 throughout the audible region. In general, I would say the P-39F would be a relatively easy load to drive, even for small wattage tube amplifiers. The 100 Hz - 400 Hz region that has low impedance corresponds to a phase within -400 to +450.
I interviewed Claytor from Klipsch about the P-39F. Click on his photo below to download a video of the interview.
Conclusions About the Klipsch P-39F Speakers
The new Klipsch Palladium P-39F speakers are impressive. It takes very little power to drive them, they sound neutral, and a strong point is their remarkable ability for pinpoint instrument and voice localization across the soundstage.