KHE Audio | ACS 4x4

4x4 Switching System for Guitar Amplifiers, Speaker Cabinets and Load Boxes
with Attenuator Insert Loop, Dual-Cab Mode and MIDI control

The KHE ACS is the most advanced guitar amp switcher on the market:

✔ switch between any combination of guitar amps and cabs instantly, by the push of a button
✔ switch between speaker cabinets and load boxes for silent recording
✔ run pedals like boosts, overdrives, distortion and fuzzes in front of all amps
✔ use a single power attenuator across all amps
✔ full MIDI control

✔ switch while you play - no need to put amps into standby or stop playing!
✔ works with tube & solid-state amps, speaker cabinets & load boxes, heads & combos
✔ 100% safe for tube amps: no amp can be activated without a load, amps are protected by a load resistor
✔ modular system, multiple switchers can be linked together to expand switching capabilities

FEATURES ACS 4x4

• Amp and Cab Switching – instantly switch between 4 amps and 4 cabs. No need to put your tube amps into standby or stop playing!

• Attenuator Insert – attenuate the volume of all amps by inserting a global power attenuator into the post-amplifier pre-speaker insert loop (like Waza TAE, OX Top Box, Two Notes etc).

• Dual-Cab Mode - activate and play two speaker cabinets or load boxes in parallel at the same time

• Midi Remote Control - manage your entire amp collection at your footstep by using MIDI footswitch to control the ACS

• Link Mode - multiple switchers can be linked together to expand switching capabilities. Mix and Match the different models, and grow your switching system with your needs! 4x2, 4x4, 8x4, 8x1, 8x8, 12x4, 16x4, 16x8 ... everything is possible!

• Tuner Output

• Front & Rear Guitar Input

• Gound Lift

WIRING DIAGRAM

TECHNOLOGY

Inside the ACS, a digitally controlled relay matrix switches between all amps and cabs. The switching procedure is timed and controlled by a microcontroller for fast, precise and reliable switching. A special mute circuit removes any clicks and pops during switching -the switching process is more silent than most amp’s channel switching! Advanced shielding techniques are used inside the ACS to shield the sensitive input lines from the powerful output lines.

COMPATIBILITY

The KHE ACS is compatible with all types of amplifiers and load devices, such as tube amps, solid-state amps, speaker cabinets, load boxes and power attenuators, up to 150 watts per channel. It works beautifully from sparkling clean sounds to ripping high-gain tones!

SAFETY FEATURES

Load Resistors - All amps are connected to a dummy load resistor to protect the power amps. All unused amps get muted at their inputs, so no signals can reach the power amp.

Load Detection - Cabinet jacks are supervised for a speaker cabinet or load box. If no load is connected, the cabinet outputs are automatically locked and excluded from the switching operation.
This ensures amplifiers can never be activated without a real load connected.

No Cab? No Amp! A clever digital switching logic makes sure no invalid combination is possible: If no load is activated, you can not enable an amplifier.

SPECIFICATIONS ACS 4x4

◾ Amplifier Switching: 4x (mono, one amp active at the time)
◾ Cabinet & Load Switching: 4x (two cabs can be active at the time)
◾ Load Resistors: YES
◾ Dual-Cab Mode: YES
◾ Attenuator Insert Loop: YES
◾ FX-Loop Switching: NO
◾ MIDI Control: YES
◾ Tuner Output: YES
◾ Modular System: YES
◾ Ground Lift: YES

◾ Switching Element: Relays, analog, sequential switched
◾ Control System: Microcontroller, digital
◾ Power Handling: switches max. 150 Watts per Channel
◾ Amplifier & Speaker Impedance: 1:1 pass-thru, passive

◾ Amp Switching: switches both guitar input and speaker output
◾ Attenuator Insert: serial, passive, Speaker Level
◾ MIDI Control: MIDI Input, 15 Channels, CC & PC Messages

◾ Switching Time: 15ms max.
◾ Contact Resistance: > 0.1 Ohm
◾ Guitar Input Impedance: 2,2 MOhm
◾ Guitar Input Type: active buffered
◾ Guitar Input Level: 15Vpp / +18dBu
◾ Frequency Range: 10-100kz +/-0.2dB

◾ Dimensions: 483 x 200 x 44mm / 19” 1U
◾ Enclosure: 1,5mm Steel
◾ Weight: 3.5kg
◾ Power Supply: 15VDC, 90-240VAC, external type, included
◾ Connectors: colour-coded for easy wiring
◾ Country: Switzerland
◾ Warranty: 2 Years
◾ User Manual: LINK

IMPORTANT NOTES

◾ no amp can be activated if no load is activated!
◾ no stereo amp switching - mono only!
◾ no bi-amping - only one amp active at the time!
◾ no cables included (instrument, speaker or midi)
◾ no built-in load box for silent recording (external load required)
◾ no remote foot controller included

SHIPPING & DELIVERY

◾ Payment: Credit Card or PayPal in CHF (Swiss Francs). For Bank Transfer (IBAN), send us a message.
◾ Stock units are usually shipped within one working day
◾ Shipping from Switzerland (non-EU)
◾ Price excluding VAT. Import charges may apply for the customer on import.
◾ Worldwide shipping!
◾ Shipping: USA + CA: 99 CHF , EU + UK: 48 CHF, others: see checkout
◾ Shipping Delivery Time: USA 2-5 days, EU 5-8 days (UPS Express or UPS Standard)
◾ The shipment is fully covered by insurance. If it's lost or damaged, you'll get a new switcher!

Any questions about the switcher?
Not sure which switcher to choose?

Send us a message if you have any questions!

PRODUCT LINE UP

The KHE ACS-Series contains 7 amp switcher models with different sizes and switching options: