Void KRYO K8 User manual

acoustics
KRYO K8
POWER AMPLIFIER
OWNER'S MANUAL

OWNER'S MANUAL
Technical and design specifications are
subject to change without notice
KRYO K8
POWER AMPLIFIER
Kryo 8
acoustics

Page 3
Kryo Series Power Amplifiers
acoustics
TO PREVENT ELECTRIC SHOCK, DO NOT
REMOVE TOP OR BOTTOM COVERS.
NO USER SERVICEABLE PARTS INSIDE.
REFER SERVICING TO QUALIFIED
SERVICE PERSONNEL. DISCONNECT
POWER CORD BEFORE REMOVING
REAR PANEL COVER TO ACCESS GAIN
SWITCH.
Shock Hazard - Do Not Enter
Choc Hasard - N*entrent
Schocke Hazard - Test Nicht
Betrete
Urto Hazard - Do Non Entrano
WARNING
TO REDUCE THE RISK OF ELECTRIC
SHOCK, DO NOT EXPOSE THIS
EQUIPMENT TO RAIN OR MOISTURE!
Magnetic Field
CAUTION: Do not locate sensitive high-gain equipment such as preamplifiers or tape decks
directly above or below this unit. Because this amplifier has a high power density, it has a
strong magnetic field which can induce hum into unshielded devices that are located nearby.
This field is strongest just above and below the unit. If an equipment rack is used, we
recommend locating the amplifier(s) at the bottom of the rack and the preamplifier or other
sensitive equipment at the top.
The lightning bolt triangle is
used alert the user to the risk
of electric shock
The exclamation point triangle is used
to alert the user to important operating
and/or maintenance instructions.
Printed on
recycled paper.
IMPORTANT
THE PRODUCT REQUIRES
CLASS 2 OUTPUT WIRING.

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Kryo Series Power Amplifiers
acoustics
Features
Rugged, touring grade chassis. E.I.A. Standard 19" (48.3cm) rack-mountable.
Ultra compact and lightweight 2u design.
Full PC control via optional Ethernet Module.
Super high frequency switch mode power supply.
Optional add on Modules extend operational capability.
Intelligent Clip limiters prevent harmful signals from damaging loudspeakers.
Parallel switch for channel linking.
Dual and Bridge modes for optimal load matching.
Balanced XLR inputs with Speakon and Binding Post outputs.
Complete protection against shorted outputs, mismatched loads, overheating and DC input/output.
Three year warranty and guarantee.
Precautions
Although your amplifier is protected from external faults, the following safety precautions are recommended:
1. The power switch must always be in the "off" position before connecting the amplifier to the mains
supply.
2. Do not change the position of the bridge mode switch unless the amplifier is switched off.
3. There are important differences between Dual, Parallel and Bridge modes. Please refer to page 8 for a
detailed description of the different modes and there uses.
4. Switch off the amplifier or turn down the inputs before connecting to the in/out XLR's.
5. Do not short the ground lead of an output cable to the input signal ground. This will form a ground loop
and may cause oscillations.
6. Do not operate the amplifier from AC mains in excess of 10% variation above or below the selected line
voltage, and only at the specified line frequency.

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Kryo Series Power Amplifiers
acoustics
Front Panel
1.Power Switch
Used to turn the amplifier on or off.
2.Power LED's
The blue LED lights when the amplifier is switched on.
The amber LED lights when the amplifier is in stand-by mode and is
remotely activated via Ethernet.
3.Level Controls
Used to control CH A and B's output level.
4.Status LED's
SIGNAL
When illuminated the signal LED's indicate an audio signal is present at the
channel's input.
ICL
The ICL LED's indicate when the ICL limiter is active. The limiter circuit
examines the audio output signal to prevent the amplifier from clipping.
See page 6.
TEMP
Indicates when temperature protection is active.
PROT
The protect LED's light up when the amplifier goes into protect mode.
See page 6.
1
2
3 3
2
4 4
Kryo 8
acoustics

Page 6
Kryo Series Power Amplifiers
acoustics
1
Rear Panel
1.Input XLR's
The input impedance of the balanced XLR's is 20KΩ. Pin 2 is signal +
2.Link Out XLR's
Linked outputs from the inputs.
3.Mode Switch
Selects Dual, Parallel or Bridge Mode. See page 8 for more details.
4.Gain Selection Switch
The three position switches select either 26, 32 or 38dB of gain.
The default setting is 32dB.
5.Power Cable
AC power in 230 VAC 50/60 Hz.
6.Ethernet Connector
Optional Ethernet module to allow remote control via a PC.
7.Output Connectors
In dual or parallel modes connect to pins +1 and -1 on out A or out B.
Out A/B is also wired so that channel A outputs on pins +1, -1 and
channel B outputs on pins +2, -2. In bridge mode use out A/B and
connect to pins +1, +2. The binding posts accept both 4 mm plugs
or bare wire.
2
3
45
6
7

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Kryo Series Power Amplifiers
acoustics
Protection System
Each Kryo amplifier features a complete protection system that monitors the
main amplifier parameters (load status, signal input, temperature, current etc)
The system controls the amount of power that the amplifier delivers under three
basic circumstances.
1. The power on sequence, where the output is inhibited until the amplifiers
circuits are ready to operate. This routine is repeated at every restart, not
just when the power switch is activated.
2. When internal temperatures rise to the near thermal shutdown point due to
unfavourable operating conditions. Here the system takes control, restricting
current to maintain operational continuity at the precise power level at which
the amplifier is capable of withstanding at the particular moment.
3. Excessive mains current consumption. This event only occurs either under
laboratory conditions (long term sinusoidal signal testing with dummy loads)
or, for example, in conditions of prolonged acoustic feedback. Here the
protection system takes control to avoid any damage to the speakers and to
prevent the mains breaker from tripping or the fuses blowing.
ICL Intelligent Clip Limiter
The Kryo series of amplifiers use an intelligent anti clip system that differs from
conventional clip reduction systems. The system dynamically tracks the power
rail values to provide instant current/voltage limiting, this eliminates any limiting
of the signal dynamics. More like a valve amplifier, the ICL system maintains
sonic transparency even when the amplifier has exceeded the threshold of
clipping, providing very high dynamics at negligible distortion levels.

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Kryo Series Power Amplifiers
acoustics
Correct function: OK/PROT lights
Green.
ICL: The Intelligent Clip Limiter is ope-
rating (see page 6).
No Signal: (OK/PROT Lights Green)
No Input Signal is reaching the amplifier.
Overheating: The amplifier has rea-
ched the maximum operational tempe-
rature. Most common cause is: the nor-
mal air flow is blocked, accumulated
dirt, dust or object leaning against the
grill. Check and clean periodically.
PRO: Several causes can trigger this
LED, refer to page 6 for more details.
OK/PROT TEMP SIGNAL ICL
LED Status
In the event of incorrect connection or a malfunction, the amplifier will activate one
or more of its LED's to warn about the problem.
OK/PROT TEMP SIGNAL ICL
OK/PROT TEMP SIGNAL ICL
OK/PROT TEMP SIGNAL ICL
OK/PROT TEMP SIGNAL ICL

Page 9
Kryo Series Power Amplifiers
acoustics
System Connections
Dual Mode
In dual mode connect individual sources to inputs A and B and set the mode
switch to dual. Channel A's input will output from out A, channel B's input will
output from out B. Out A and out B use pins +1,-1 or you can connect to out A/B
with 4 core cable, where pins +1,-1 are for channel A and pins +2,-2 are for
channel B. This type of arrangement could be used for 2 way active speakers,
where channel A would be bass and channel B would be HF. If 4 core speaker
cable was used then the speaker would be connected from out A/B. Note, this
arrangement would only work if the speakers were wired pins +1,-1 to the
woofer and pins +2, -2 to the HF unit.
Parallel Mode
If the mode switch is set to parallel, then channels A and B will receive the same
signal. This mode is useful if you only have 1 input source but want to feed both
amplifier channels. Typical arrangements could be powering 2 speakers from a
mono output, in which case you would connect the mono source to input A and
set the mode switch to link. The same signal will now appear at both out A and
Out B.
Note the parallel mode on Kryo amplifiers is not like the parallel mode on some
amplifiers that allow you to drive into very low impedances. Parallel mode on Kryo
series amplifiers makes both inputs receive the same signal.
Bridge Mode
In bridge mode channels A and B are combined to form one channel. To enable
bridge mode set the mode switch to bridge. Use input A and out A/B for the output.
Connect to pins +1 and +2. Pin +1 is signal +. Note that the minimum impedance
in bridged mode is 4 ohms. The binding posts can also be used for the output.
Use CH A + and CH B +.

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Kryo Series Power Amplifiers
acoustics
Dual Channel
Paralleled Inputs
Bridged Mode