Krell Full Power Balanced X Series FPB 350Mcx Monoblock Amplifiers, 350-700-1400 Watts! SERVICED By KRELL


Killer class A monos from Krell capable of delivering up to 1400W at 2 ohm load!

Innovative circuit designs eliminates much of the heat generated by Class A while delivering all the sweetness.

Best of all they are actually not all that heavy or large as other amps we've seen at this power rating. They are a mirror image set which look amazing side by side.

These amps were re-capped and serviced officially by Krell not too long ago (over $2K) so its new owner can expect many many years of trouble free operation. Our technical staff confirmed the paperwork with a look under the hood.

This model is fairly rare and doesn't come up very often.

Retail for these bad boys back in the early 2000's was over $17,000 for non "X" version.

Krell Full Power Balanced X Series FPB 350Mcx Monoblock Amplifiers Manual

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - XLR Interconnects

Kimber Kable - Speaker Cables

Kimber Kable - Bi-Wire Speaker Cables

Kimber Kable - 14AWG (Gauge) Power Cords

The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.



Original Boxes



Yes and Online


Not Applicable


Yes - Power

Physical Condition


Working Condition


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