> Classifieds > > > Musical Fidelity 550K Amplifier PAIR (550 Watts/each)

EXPIRED - FOR SALE: Musical Fidelity 550K Amplifier PAIR (550 Watts/each)

Item #649359047
Info: Musical Fidelity 550K Amplifier PAIR (550 Watts/each)

Asking Price:
USD $2150.00
Retail Price: USD $5000.00
Payment method: Cash, Money Order
Condition: N/A (?)
Date Posted: Jun 04, 17 5:03pm (PST)
Edited: Jun 04, 17 11:44pm
About Seller: scratch33
United States
[other classified ads]
Product Brand: Musical Fidelity
Product Model: 550K
Feedback Received: 23  See details
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**Note – please read entire ad prior to replying, otherwise you may not get a response**

2 somewhat scarce Musical Fidelity Supercharger 550k monoblock power amplifiers are up for sale in near mint condition – will not separate. These audiophile grade amplifiers can be run in mono block configuration via traditional line level single ended input, or in mono block Supercharger configuration increasing the output of a stereo or mono amplifier without degrading or altering the sound of your favorite amplifier. Utilizing the second option mentioned above, you connect your existing amplifier's output from its speaker terminals to the 550K's input terminals. Then, using a short jumper cable, you connect the 550K's output terminals to your speaker’s binding post inputs. Thus, instead of your regular amplifier seeing a typical reactive, low-impedance loudspeaker load & being called upon to produce volts, amps, & high peak current beyond its capabilities as it attempts to follow the music's dynamic range, it instead sees the constant resistive load of a high-impedance input circuit. A stereo amplifier (or mono-block pair) driving the 550K is called on to deliver only about 7% of the current required to drive a typical loudspeaker. Essentially, your existing amplifier is now acting as a preamplifier for the 550K, without losing its inherent sonic virtues! If you already like the sound of your amplifier—especially if it's a tube amp with a typically high output impedance that will interact with a loudspeaker's varying impedance to produce frequency-response aberrations—you will like it even more when you hear it driving a pair of 550Ks.

These originally sold for $5000.00 pair, so this is a reasonable deal for these versatile amplifiers in this remarkably well cared for condition. It would be difficult to find these in better shape unless they are new old stock.

These amplifiers are incredibly detailed sounding on their own with effortless power throughout the frequency range. They are quite unique considering the aforementioned setup flexibility, so if you have a vintage amplifier, either tube or solid state that you are happy with, but wish it had more power, here is your chance to fulfill your wishes without altering that great sound you are currently enjoying with much more dynamic range.

Both are in very near mint condition (see pictures – I won’t say mint as you might find a very small/insignificant mark somewhere, but they are in nearly new cosmetic condition).

**Each amplifier includes its original DOUBLE shipping box (with original foam inserts and bags), a copy of the owner’s manual and also the power cord as pictured.

There are many well deserved positive reviews on these amplifiers in the worldwide audiophile press. Please check out the following examples (by cutting and pasting to your internet browser) as follows if interested:



Specifications as follows:

Description: Solid-state, monoblock power amplifiers with line and speaker level inputs.

Power output: 550W into 8 ohms (27dBW), 750W into 4 ohms (25.75dBW). Output voltage: 66V RMS, 20Hz–20kHz; 186V peak–peak. Current: 250 amps peak–peak. Frequency response: 20Hz–30kHz, +0/–0.2dB. THD+noise: <0.016%, 20Hz–20kHz. Damping factor: 220. Input impedance: 50k ohms (line), 50 ohms (speaker). Input sensitivity for full power out into 8 ohms (line): 2.23V, speaker 33V. Signal/noise (no reference level quoted): >120dB (line input), >115dB (speaker input).

Dimensions: 16" (404mm) H (including feet) by 8 1/2" (215mm) W by 8 3/4" (220mm) D (including terminals).
Weight: 33lbs each.

Cash or USPS Money Order only – NO exceptions, so please do not ask – in addition, I will not negotiate pricing without having cash in my hand, so please do not ask for any discounts in advance. I will remove this ad as soon as these are sold so please do not inquire unless you are serious buyer. With prior payment in advance, if you desire, I will ship these amps including insurance within continental USA (lower 48 States only) for an extra $150.00/pair including my time and expenses to transport to shipping facility. I am not interested in supplying additional shipping quotations, so please do your own research in this regard if you wish to try to save money using your own account.

**If you are a serious buyer, please reply with your full name, telephone number, location and E-mail address and I will reply to you ASAP – if you do not supply the complete aforementioned info, you will not receive a reply due to spammers galore – also please, no trades, stories, comments, etc – thanks for your understanding!**

This ad was originally posted on US Audio Mart US Audio Mart.


Original DOUBLE boxes and inserts, copies of owner's manuals and power cords.

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