KRELL SOLO 375 XD Krell_Solo375XD_sellsheet.pdf

337755 WWaatttt MMoonnoo PPoowweerr AAmmpplliiffiieerr wwiitthh KKrreellll iiBBiiaass

CCllaassss AA TTeecchhnnoollooggyy

SOLO 375 XD

MONO POWER AMPLIFIER

375 WATT AMPLIFIER FEATURING KRELL IBIAS TECHNOLOGY

Krell® is a registered trademark of Krell Industries, LLC., and is restricted for use by Krell Industries LLC., its subsidiaries, and authorized agents. All other trademarks and trade names
are registered to their respective companies. © 2018 by Krell Industries, LLC. All rights reserved.

Krell Industries, LLC. • 45 Connair Road • Orange, CT 06477-3697 USA

Tel: [phone] • Fax: [phone] • Sales Dept: 203-298-4010 • [e-mail] • www.krellonline.com

All operational features, functions, specifications, and policies are subject to change without notice.

SOLO 375 XD

375 WATT MONO POWER AMPLIFIER

Krell iBias Class A amplifiers are the first to deliver the rich musicality of Class A amplifiers, the uncompromised
dynamics of classic Krell amplifiers, with much greater efficiency than traditional Class A amplifiers.

DESIGN

Circuitry Highlights

Krell iBias Class A technology allows our latest amplifiers
to run in full Class A mode to full power while minimiz­ing heat generation.

All signal gain is realized in the current domain using dis­crete, proprietary, multiple-output current mirrors with
extraordinary open loop linearity. There are no generic
integrated circuits or op amps used anywhere.

The signal path is fully complementary and balanced.
Independent complementary pre driver and driver
stages for the positive and negative output transistors
make the output stages extremely fast and linear.

Krell amplifiers are fully direct-coupled, with no
capacitors in the audio signal path. This design gives
the Krell amplifiers lower internal impedance, which
allows firmer, more precise control of your speakers.

Power Supply Highlights
One 787VA toroidal transformer feeds amplifier modules
that include the audio circuitry, rectifier, and power
supply

filtering mounted to an individual heat sink.

This design shortens the electrical path from the power
supply to the output transistors, reducing the overall
impedance and allowing the circuit to respond faster and
control the speakers better and more accurately.

FFeeaattuurree HHiigghhlliigghhttss

Network connectivity brings convenience, monitoring,
and reporting to end users from any smartphone, tablet,
or laptop.

Amplifier configuration options include display brightness
and timeout. For energy conservation, the amplifiers can be
programmed to power off at a preset time of inactivity.
Individual channels can be muted and firmware updates can

e initiated from the web server.

b

XD Explained

Krell’s “XD” (Xtended Dynamics, Xtended Dimensionality, Xtended Detail) upgrade for the iBias amplifiers takes
an already great sounding amplifier and raises its performance to the next level. “XD” is a classic example of Krell’s
continuous R&D efforts reaping benefits across multiple product lines. During the development of the K-300i
Integrated Amplifier we discovered substantial sonic improvements by lowering the output impedance below
traditional norms. So we applied this technique to our existing line of amplifiers and the improvement was so
substantial that it required a unique designation, hence, “XD.”

It was no simple matter to just lower the output impedance. This affects the amplifier’s stability and transient
response so each stage prior to the output stage had to be re-tuned to work optimally with the lower output
impedance. This lower output impedance exerts more control over the speaker drivers and damps out unwanted
vibrational modes, allowing a more accurate reproduction of the original signal.

SPECIFICATIONS

375 Watts into 8 Ohms

•

• 1 ea - Single-ended RCA and Balanced XLR Inputs

• 1 RJ45 Ethernet Port

• 1 12V Trigger Input

• WBT Speaker Binding Posts

• Optional Rack Mount Kit

• 17" (43.3cm) W x 7" (17.7cm) H x 21" (53.1cm) D

• Weight: 57lb (25kg)