Knoll GS8, GS12 User Manual

GS8 and GS12 Eco-System™ Amplifier specifications:

Inputs: 8 or 12 gold RCA jacks with adjustable gain
Input impedance: 50k ohms
Outputs: 5 way gold binding posts
Output power: 50 watts RMS per channel (8 ohms)
Peak output power: 100 watts per channel (8 ohms)
Ideal impedance: 4 – 8 ohms
Frequency response: 10 Hz – 40 kHz +/- 1dB (1w)
S/N ratio: Over 105 dB A weighted (50 watts)
THD distortion: Less than 0.1% 20 Hz to 20 kHz
IMD distortion: Less than 0.01% 60 Hz 7 kHz 4:1 (SMPTE)
Dimensions: 17” x 3.5” x 11.5” (432 x 89 x 292 mm)
Fan noise: Quiet 28 dBA
Power: Standby in Eco-System™ less than 5 watts

Maximum 750 watts at 117 VAC or 230VAC
Weight: GS8 20 lbs (9 kg); GS12 22 lbs (10 kg)
Construction: Steel chassis, powder coated; glass epoxy
printed circuit boards

Warranty

Knoll Systems warrants its products sold in the USA and Canada by
authorized Knoll dealers to be free of defects in materials and
workmanship. This warranty extends for three full years from the date
of purchase by the original consumer. Any products returned to Knoll
Systems and found to be defective by Knoll Systems within the
warranty period will be repaired or replaced at Knoll Systems option, at
no charge. Knoll Systems will not be responsible for the actual cost of
installation or removal of the product, nor for any incidental or
consequential damages. Some states do not allow the exclusion or
limitation of incidental or consequential damages, so the above
limitation may not apply to you. This warranty gives you specific legal
rights. You may have additional legal rights that vary from state to
state.

Knoll Systems www.knollsystems.com

145 Tyee Drive Point Roberts, WA 98281
12140 Horseshoe Way Richmond BC V7A 4V4
tel [phone], fax [phone]

Made in Canada GS18 and GS12, 2005, Knoll Systems All Rights Reserved

GS8 GS12

Eco-System Power
Amplifiers
Installation Instructions v1.2

Warning: To be installed and/or used in accordance with

appropriate electrical codes and regulations.

Introduction: Thank you for your purchase of a Knoll
Eco-System multi-channel power amplifier and
congratulations on your choice. This amplifier is
specifically designed to save energy when idling, which
can be most of the time. When compared to similar power
amplifiers the GS8 and GS12 uses less than 5% of the
energy required for normal amps to idle.

FEATURES:

• Eco-System™ Circuitry saves energy (and
money) and increases power.

• 12 channels x 50 watts RMS at 8 Ohms (over
100W peak). GS8 8 channels.

• Individual and automatic channel resetting
protection for low impedance, overheating,
overloading, overvoltage and undervoltage.

• Individual gain controls for all channels.

• Electronic Link feature connects stereo inputs

channel 2 through 6 to channel 1. GS8 connects
stereo inputs channel 2 through 4 to channel 1.

• Side-mounted thermostatically controlled fan for
internal cooling.

• Two rack spaces (3-1/2”) with optional rack
mount version.

The eco-friendly choice

The Knoll GS8 and GS12 are class A/B amplifiers that produce
50 watts per channel at 8 ohms and 70 watts per channel at 4
ohms. While offering unparalleled reliability, power and sound
quality the GS8 and GS12 offers a Knoll exclusive, the Eco­System™ circuit. This patent pending circuit determines which
of the 12 stereo channels (6 pairs) are in use and delivers
power only to those channels needing it. The channels that are
“off” are truly off, not in “standby” or “mute”. With this circuit
the active channels share more rail voltage resulting in more
reserve power for the stereo channels in use.

The most important feature of the Eco-System™ circuit is the
electrical savings that is delivered to the owner over what a
comparable class A/B amplifier will cost to operate. The typical
homeowner will see a savings of a hundred dollars or more per
year in actual electrical costs and that can be multiplied when
taking into account the increased costs of air conditioning the
home to extract unwanted heat produced by a typical multi­channel amplifier. The GS8 and GS12 also feature a very quiet
energy saving thermostatically controlled fan. A comparable
amplifier without the Eco-System™ circuit (we should know, we
make lots of them) uses about 14 times (65 watts) as much
power while idling in standby. By comparison the GS12 with
Eco-System™ uses under 5 watts while idling!

For over 15 years Knoll multi-channel amplifiers have sold
around the world because of their legendary reliability and
unparalleled sound quality. The GS8 and GS12 take the next
logical step by being eco-friendly. Please consider the
environment when choosing your next system.

Sound cuts out 1. Verify speaker impedance is 4-16 ohms.
Changing speakers may be required.

2. Check if the amp feels hot. If it's
hot, increase cooling - see
Installation.

Sound is distorted 1. Turn the volume down.

2. Check speakers for damage.

3. Check inputs for proper levels.
GS8 or GS12 gain and source output

Level may have to be adjusted.

4. Speakers may be less than 4 ohms.

GS8 or GS12 does 1. Turn GS8 or GS12 power switch off
turn off (out).

2. With the power switch on, and all input

channels music source turned on, very
slowly adjust “SENS” on rear of

amplifier in a clockwise direction until
amp turns off.

Speaker pops when 1. Speaker may need resistor placed
amp turned on or off across terminal. Suggest 2k0 1/4 w.
This discharges the speaker internal

capacitor.