Cello Duet 350 Amplifier - Rare and Powerful

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Here is likely the cleanest and best performing Duet currently available on the market anywhere today.

These don't come up frequently, and when they do they often suffer from technical issues. This piece was thoroughly tested and certified in our shop and is working perfectly.

Designed by renowned engineer Mark Levinson, the Cello line of products exemplify the absolute top of the class. Coveted by audiophiles and collectors, Cello products don't trade very often.

In immaculate cosmetic condition and looking just like the day it left the factory.

This is the first set we've ever had into our shop consisting of their preamp, DAC and amplifier. Click here to see all Cello pieces we currently have for sale.

Click here for a PDF copy of the Cello Duet 350 Owner's Manual

The Duet 350 Amplifier

Real music fills a room. Even the softest instruments are more present in life than most music systems can reproduce from recordings. Part of the problem has been the limitations in power amplifiers.
The Duet 350 Power Amplifier is a stereo power amplifier that has achieved affordable excellence in sonic quality, power capability and reliability.

In its normal stereo mode it has more than enough power to drive most speakers to their limits with the kind of open, clear, effortless sound which are the hallmark of Cello. When used in a bridged configuration, the Duet 350 becomes a mono block power station capable of high speed and powerful dynamics under any condition.

The Duet 350 Amplifier has been specifically designed by Cello engineers to be compatible with a wide variety of available equipment.

Our Testing Process for Amplifiers (Solid State) at SkyFi:

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.

Product Specifications:

Class of operation:
Class AB2

Power Output (single amp):
@8 Ohms Rated: 350 Watts
@4 Ohms Rated: 600 Watts

Power Output (bridged amps):
@8 Ohms Rated: 1,200 Watts

IMD (SMPTE):
0.3% (60 Hz / 8 Ohms / 52.92 V Output)

IMD (CCIF):
<0.2%

THD (20 - 20000Hz):
<0.3% (8 Ohms / 52.92 Volt Output)
<0.6% (4 Ohms / 49 Volt Output)

Frequency Response:
+0/-0.8 dB @ 10 - 20000 Hz

Dynamic Headroom:
1.8 dB

Channel Separation:
90 dB

Signal to Noise:
< -100 dB (10 - 22000 Hz / Rated Output)

Input Sensitivity:
1.491 V (8 Ohms / 350 Watts / 52.92 Volt Output)

Input Impedance:
1 mOhm (Non-Inverting)
5000 Ohm (Inverting)
1 mOhm (Unbalanced)

Gain:
31 dB (Unbalanced)
37 dB (Balanced)

Dimensions:
19"w / 12.62"h / 23.25"d

Shipping Weight:
100 lbs.

Please click here for detailed specifics regarding our specialized packing process that separates us from the rest.