KHE ACS SERIES – USER MANUAL www.KHE-AudioElectronics.com 20 / 23
INPUT BUFFER
After the guitar input jacks, a high-end impedance converter («buffer») is built into the ACS. This buffer
converts the high-impedance guitar signal into a low-impedance signal, which makes the signal more stable
and less sensitive to noise or other interference. With this buffer, the length of cables connected to the ACS
outputs doesn’t matter anymore (no signal- or high-end-loss). The buffer circuit is high-end studio-grade
quality, capable to swing output-voltages up to 15Vpp without any distortion or coloration. The input
characteristics of the buffer reproduce a classic tube input stage. This buffer circuit is an essential ingredient of
the ACS and cannot be disabled.
USING AMPS WITHOUT LOAD
The ACS is not replacement for a load box! Always connect at least one load device, such as a speaker cabinet
or load box, to the ACS.
LOAD DETECTION
Each cabinet jack is equipped with a detection circuit which monitors the state of the cabinet jack. If there is no
valid speaker cabinet or load connected, it is not possible to enable the cabinet ouput. The detection circuit
measures the actual cabinet, not just the switch contact on the jack.
LOAD RESISTORS
Each amplifier has its own internal load resistor to protect the unused amps from damage and failure. Unused
amplifiers get muted at their input, so no signals can reach the power amp.
TECHNOLOGY
Inside the ACS, a massive relay matrix switches between amplifiers and load devices up to 150 watts. The
switching procedure is precisely timed and supervised by a microcontroller for fast and precise switching,
making sure no invalid combinations can happen. Advanced shielding techniques are used inside the ACS to
shield the sensitive input lines from the powerful output lines. The KHE ACS is built in Switzerland, using highest
quality parts and construction, such as high-quality toggle switches, AMPHENOL jacks, OMRON relays, in a
robust 19" 1u steel enclosure.
PEDALS IN FRONT OF THE AMP
Using pedals like boosts, overdrive, distortion, fuzz, eq, gates, filters, reamp boxes etc. work perfectly in front
of the ACS. Make sure to use clean power sources and quality cables for your pedals!
AMPS WITH BUILT-IN EFFECTS
It is possible to use amps with build-in effects, or to use effect pedals with single amps in their fx-loops, without
having them connected to the ACS. However, in case you use time-based effects such as Delay or Reverb,
follow some additional operation rules. Always make sure to either: a) turn the effect pedal off before
disableing or changing an amp or b) let the effect completely ring out before disabeling or changing the amp.
Ignoring this rule may damage the ACS or the connected amplifiers!
CABLE TYPES
For all BLACK jacks, use high quality shielded unbalanced instrument cables only. For all BLUE, RED and WHITE
jacks, use high quality unshielded unbalanced speaker cable only (2x 1,5mm
2
or higher).
CABLE LABELING
It’s useful to equip all cables with numbered labels on both ends for easy identification of the connected
amplifier to avoid wiring faults. Use masking tape or such.
THINGS TO KNOW
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