Krell S-550i – High End Stereo Equipment We Buy

McIntosh is one of the most dependable brand names when it comes to high-end audio systems. For years the brand has been recognized by audiophiles throughout the world as equipment that delivers clear and consistent quality in music. McIntosh is probably best known for its amplifiers and preamps, but the company produces many other components and parts for stereo and home theatre.

What are the specs for the Krell S-550i?

Fully Balanced Differential Class A/B Integrated Amplifier
Power Output:
275 wpc (8 Ohms); 550 wpc (4 Ohms)
less than 0.025% at 1 kHz
Frequency Response:
20 Hz – 20 kHz +0, -0.08 dB
1 Balanced XLR, 3 Unbalanced RCA, 1 iPod 30-Pin Connector
1 Pair Pre Out RCA and 1 Pair Speaker
Input Impedance:
Balanced – 95 kOhms; Single-Ended – 47.5 kOhms
Output Impedance:
less than 0.073 ? at 20 Hz; less than 0.08 ?, 20 Hz to 20 kHz
Damping Factor:
greater than 110 at 20 Hz (8 Ohm Load); greater than 75, 20 Hz to 20 kHz (8 Ohm Load)
5.84″ H x 17.26″ W x 17.70″ D
64 Pounds

What else to know about the Krell S-550i?

"The Krell S-550i is a winner in just about every way. I’ll mention that up front that I did want a few extra features. It would be nice if the readout would show iPod metadata from the dock. And I would like to see a dedicated mono subwoofer line level out. Those are two very minor wishes. The real story is in the massive performance you get from this fine product. That’s what you’re paying for, right?

The S-550i is solid, rugged and reliable. Its performance is incredible in both the listening tests and on the bench tests. It has high bandwidth and low measured distortion especially considering it has no global negative feedback in the preamp stage.

On listening, the sound is vibrant, dynamic and dimensional. Pure Americana in so many ways . . . A high damping factor means it will grab your speakers by the cajones and never let go. Plus it puts out huge amounts of power with high current capability and the ability to double down when the load is halved. This is where the passion, drive and delicacy are unleashed from you favorite music. Don’t forget that the S-550i handles cinema well; so deeply quiet when required and so ruthlessly gripping when demanded. A very solid all-around performer that really is capable of driving just about any speaker I can dream of." - Secrets of Home Theater and Hi Fidelity

Brief History of McIntosh

Long mapped-to Binghamton New York – the current headquarters and manufacturing center for Krell Labs – not many people know the brand was originally launched outside of the Nation’s Capital in Silver Spring Maryland, in 1949. In 1956, the brand built their original facility in New York, according to the official brand website.

StereoBuyers has purchased tens of thousands worth Krell brand equipment since 2014, with individual buys ranging from $100 to well over $50,000. If you are moving, ready to upgrade, or have Krell equipment you do not or will not be using, why not contact us today to find out if it is worth good money?

If you are interested in selling your used Krell equipment to us in the greater NYC area or Colorado, please click here to fill out a Free Quote Form and we will get back to you. If we agree on terms, we come to meet you where you want, and pay cash.

The following images show actual Krell equipment purchased by StereoBuyers.