KAHAYAN Proaudio 8x4 MIDI Selector User manual

8X4 MIDI SELECTOR
8 AMPLIFIERS/ 4 SPEAKER SELECTOR
OPERATOR'S MANUAL
Version 1.1
Avd. de la Estación 4, local bajo
Zarzalejo, Madrid 28293
España
[e-mail]
www.kahayan.es

2
TABLE OF CONTENTS
IMPORTANT SAFETY INSTRUCTIONS…………………………………3
INTRODUCTION…………………………….……………………………..4
RECOMMENDATIONS………....…………..……………………………..5
SETUP…………………………....…………..……………………………..6
ADVANCED SETUP (BUS INSERT, MIDI & TUNER)…………….……..7
Q&A……………...……………………………….………………...….……12
SPECIFICATIONS & WARRANTY.……………………………...….…….13
CREDITS………………………………………………………….....………14

3
IMPORTANT SAFETY INSTRUCTIONS
1. Read these instructions
2. Keep these instructions
3. Heed all warnings
4. Follow all instructions
5. Do not use this apparatus near water
6. Clean only with dry cloth
7. Install in accordance with the manufacturer's instructions
8. Do not install near any heat sources such as radiators, heat registers,
stoves, or other apparatus (including amplifiers) that produce heat
9. Protect the power cord from being walked on or pinched particularly at
plugs and the point where they exit from the apparatus
10. Unplug this apparatus during lightning storms or when unused for long
periods of time
11. Refer all servicing to qualified service personnel. Servicing is required when
the apparatus has been damaged in any way, such as power-supply cord or
plug is dam- aged, liquid has been spilled or objects have fallen into the
apparatus, the apparatus has been exposed to rain or moisture, does not
operate normally, or has been dropped

4
INTRODUCTION
The 8x4 MIDI Amplifier/Speaker Selector is a system which allows you to
connect 8 amplifiers to 4 speakers, providing the possibility of easily
selecting combinations of amplifiers and speakers. Thus avoiding waste of
time and making work easier. Useful for studio recording as well as live
performance.
Thanks to the Kahayan 8x4 MIDI Selector we can select/choose any amplifier
and speaker combination with the front panel buttons, with a MIDI pedalboard
and also with your Tablet using a MIDI/Bluetooh® interface (see page 7). That
means, if everything is connected correctly and our recommendations are
followed, you can link the amplifier that you want with the speaker that you
choose in many modes.
For more information visit: www.kahayan.es

5
RECOMMENDATIONS
Listed below are the most important recommendations for the use of the
8x4 Selector:
1- To avoid any equipment failures its vital to connect to the 8x4 Selector the
following things: the instrument, the amplifier inputs, the amplifier outputs and
the speakers. The initial connection should be with the amplifiers turned off or
Stand by.
2- Once everything has been connected with cables with soldered
connectors you can use the 8x4 MIDI Selector with all the amplifiers
permanently switched on. Its not neccesary to use the Stand By mode each
time that you want to change the amplifier.
3- In the case where some speaker outputs are not being used, be carefull
not to select them to avoid the amplifiers functioning without being charged.
4- This Selector contains an input mute system and phantom charge for the
amplifiers which have not been selected.
5- We recommend, to avoid any possible ground noise (This is not mandatory
and may the type of amplifier configuration you use you will not have ground
noise), that only one of the amplifiers is connected to the electric ground.
Preferably the most powerful amplifier or that which has the highest
consumption. By doing this avoid hum noise caused by ground loops.
NOTE: That doesn´t mean that the other amplifiers are not connected to the
ground. They are connected through the Selector. See the folllowing chart:
NOTE: We recommend that a
technician disconnect internally
the plug socket into which the
electric ground goes. Also you
can use ‘’duct tape’’ to cover the
pin ground but it is not
recommended.
AMPLIFIER 1
(MOST POTENCIAL AND THE
ONLY ONE CONNECTED TO
THE ELECTRIC GROUND)
AMPLIFIERS 2,3 … 8
(NOT CONNECTED TO THE
ELECTRIC GROUND)

6
BASIC SETUP
The following diagram explains how to connect the equipment:
*You can use all the kind of Amplifiers: Head or Combo (the Amp Power part)
4 X SPEAKER
Jack instrument Cable
Jack charge Cable
8 X AMPLIFIERS*
AMP Outputs
Inputs
SPK Inputs

7
ADVANCED SETUP
AMP BUS INSERT:
The 8x4 MIDI Selector allows you to insert an Amp Attenuator or a Speaker
Simulator. In this way, all the Amps and Speakers connected to the Selector
will be working thru this attenuator or speaker simulator. This insert opens
the bus amp and is located electronically in between amp power inputs and
speaker outputs of the Selector. The use of modern Speaker Simulator gives
you an extra analog or digital output to a DAW or other applications.
IMPORTANT NOTE: Before connect any attenuator unit all the Amps and
Selector must be turned off. The insert send and return must be properly
connected before turn on any amp. If not, the Selector may be damaged
internally. And also if the attenuator / speaker simulator load is erroneous or
damaged, the Selector may suffer internal damage.
MUTED TUNER OUTPUT:
The 8x4 MIDI Selector allows you to connect an external Tuner using the Jack
Output in the front panel. This Output only Works when you press the MUTE
TUNER switch. This is a useful mode to have a more clean pedal rig routing.
Also you can use this outuput to other functions: For example to connect in
cascade a second 8x4 selector unit, when you have a lot of Amps.
Jack charge Cable
AMP ATTENUATOR/
SPEAKER SIMULATOR

8
MIDI INPUT/THRU:
The 8x4 MIDI Selector can be controlled by MIDI data. For this function you
can use a MIDI Pedalboard or a MIDI/Bluetooh® interface (not included). Also
the unit incorporates a MIDI thru output.
1-MIDI PEDALBOARD: Using a Pedalboard allows to control the 8x4 MIDI
Selector and also many options for Live and studio aplicattions: Recall and
multi FX setups.
MIDI Cable
MIDI PEDALBOAD

9
2-MIDI/BLUETOOH® INTERFACE: When you connect a MIDI/Bluetooh®
interface at the rear of the 8x4 MIDI Selector, the world of the control by
Tablets and Smartphones opens. This Mean that you can use any MIDI app.
We don´t recommend any MIDI app in special but here you have an example:
Step1: Connect your MIDI/Bluetooh® interface, in this case the M.1 Quiccosound®.
Step 2: Then download and install the Quiccosound® app just to control the Mi.1:
Step 3: Download and install any MIDI app to control the 8x4 MIDI selector. In this
case, the Stompwatch® app:
Mi.1 INTERFACE

10
3-MIDI LIST:
By default the 8x4 MIDI Selector is programmed to work in the MIDI channel 1.
In this channel you have all this function list:
MIDI$PROGRAM$
SELECTS$
$
MIDI$PROGRAM$
SELECTS$
Program'Change'1'
Mute/tuner'out'
''
Program'Change'27'
Amplifier'3'&'Speaker'3'
Program'Change'2'
Amplifier'1'
''
Program'Change'28'
Amplifier'3'&'Speaker'4'
Program'Change'3'
Amplifier'2'
''
Program'Change'29'
Mute/tuner'out'
Program'Change'4'
Amplifier'3'
''
Program'Change'30'
Amplifier'4'&'Speaker'1'
Program'Change'5'
Amplifier'4'
''
Program'Change'31'
Amplifier'4'&'Speaker'2'
Program'Change'6'
Amplifier'5'
''
Program'Change'32'
Amplifier'4'&'Speaker'3'
Program'Change'7'
Amplifier'6'
''
Program'Change'33'
Amplifier'4'&'Speaker'4'
Program'Change'8'
Amplifier'7'
''
Program'Change'34'
Mute/tuner'out'
Program'Change'9'
Amplifier'8'
''
Program'Change'35'
Amplifier'5'&'Speaker'1'
Program'Change'10'
Speaker''1'
''
Program'Change'36'
Amplifier'5'&'Speaker'2'
Program'Change'11'
Speaker''2'
''
Program'Change'37'
Amplifier'5'&'Speaker'3'
Program'Change'12'
Speaker''3'
''
Program'Change'38'
Amplifier'5'&'Speaker'4'
Program'Change'13'
Speaker''4'
''
Program'Change'39'
Mute/tuner'out'
Program'Change'14'
Mute/tuner'out'
''
Program'Change'40'
Amplifier'6'&'Speaker'1'
Program'Change'15'
Amplifier'1'&'Speaker'1'
''
Program'Change'41'
Amplifier'6'&'Speaker'2'
Program'Change'16'
Amplifier'1'&'Speaker'2'
''
Program'Change'42'
Amplifier'6'&'Speaker'3'
Program'Change'17'
Amplifier'1'&'Speaker'3'
''
Program'Change'43'
Amplifier'6'&'Speaker'4'
Program'Change'18'
Amplifier'1'&'Speaker'4'
''
Program'Change'44'
Mute/tuner'out'
Program'Change'19'
Mute/tuner'out'
''
Program'Change'45'
Amplifier'7'&'Speaker'1'
Program'Change'20'
Amplifier'2'&'Speaker'1'
''
Program'Change'46'
Amplifier'7'&'Speaker'2'
Program'Change'21'
Amplifier'2'&'Speaker'2'
''
Program'Change'47'
Amplifier'7'&'Speaker'3'
Program'Change'22'
Amplifier'2'&'Speaker'3'
''
Program'Change'48'
Amplifier'7'&'Speaker'4'
Program'Change'23'
Amplifier'2'&'Speaker'4'
''
Program'Change'49'
Mute/tuner'out'
Program'Change'24'
Mute/tuner'out'
''
Program'Change'50'
Amplifier'8'&'Speaker'1'
Program'Change'25'
Amplifier'3'&'Speaker'1'
''
Program'Change'51'
Amplifier'8'&'Speaker'2'
Program'Change'26'
Amplifier'3'&'Speaker'2'
''
Program'Change'52'
Amplifier'8'&'Speaker'3'
''
''
''
Program'Change'53'
Amplifier'8'&'Speaker'4'
'
'
'
Program'Change'54'
Mute/tuner'out'

11
4-THE MIDI CHANNEL:
By default the Selector works in the MIDI CHANNEL 1. If you need to change it
to ‘omni’ to receive all the MIDI CHANNELS please follow these steps:
1-Turn off the Selector.
2-Open your MIDI Selector unit: Top cover.
3-Go to the MIDI Pcb and just remove the jumper number 1 as you can see
below:
4-Close and turn on the unit.
JUMPER 1

12
Q&A
Listed below are the most typical questions that we have received from the
users of the 8x4 Selector:
- Does the selector have an input buffer?
No, this unit is a transparent amp/speaker selector, with no active electronics
components in the signal path, just a very short high quality cable in the
instrument input.
- What impedance 8x4 selector uses? Can the 8x4 selector adjust the
amp impedance?
This is like a 'patchbay', you connect your amp with the speaker you want, we
don´t make adaptations. For example if you have an 8 ohm amp and you have
2 cabinets (16 and 8 ohm), you have to choose the 'correct' speaker.
- What guitar cable do you recommend? We don´t have a preferable brand
but the cables must have good quality and good soldering. We have
detected that a configuration with no quality cables changes the sound, then
users tends to think there is a problem in our 8x4 selector. Then, changes the
cables and recovers the definition and sound quality.
-Can I put all my amp heads in ’tower’ configuration (One above the
other)? You can configure all your amp heads in the way you want but the
users must take attention of the position of the power transformer (connected
to the power grid) of the amps. Some amp brands put the power transformer in
the left side of the head, and others in the right side. If you combine this two
cases amp, probably the induction of this power transformer will affect to the
second amp and you could have some noise. We recommend put the same
head amps (transformer position) in one 'tower' and the others in a second
'tower'.
- If I turn off the 8x4 selector and amps are on, is there a problem? No,
because all the amps go directly to the internal phantom load in that case, and
all your amps will be loaded.

13
SPECIFICATIONS
•8 Amplifiers and 4 Speakers Selector
•1 Jack instrument input
•1 Jack Tuner output
•8 Jack instrument outputs to Amplifiers
•8 Jack charge imputs from Amplifiers
•4 Jack charge outputs to Speaker
•1 Jack charge output and 1 Jack charge input for Insert in the Amp-Bus
•1 MIDI output and 1 MIDI thru
•Consumption: 6W.
•Power Supply: 220/110V and 50/60 Hz
•Weight: 5Kg
•The manufacturer reserves the right to change the technical
specification of the product without prior notice.
WARRANTY
These products are guaranteed for a period of two years from the date of
shipment to the end user for countries of the European Union. For other
countries, please refer to the law in effect.
During the warranty period Kahayan Pro-Audio will, at their discretion, either
repair or replace products which prove to be defective, provided that the
product is returned to an authorised Kahayan service facility.
Defects caused by unauthorised modifications, accident, negligence or any
misuse are not covered by this warranty. For further information please contact
your dealer or the distributor in your country.

14
NOTICE OF COPYRIGHT AND OWNERSHIP
All designs, circuit board artwork, front panel artwork, text contained herein
and therein, and all other intellectual material is the sole property of Pablo
Kahayan from Kahayan Audio. Unauthorized use, distribution, reproduction,
etc. is strictly prohibited. Kahayan intellectual property is protected by
international copyright laws. Violators will be prosecuted to the fullest extent of
all applicable laws.
Transfer of ownership of this unit neither confers nor implies any transfer of
ownership of the intellectual property, proprietary design, etc. contained
herein.
CREDITS
Concept: Pablo Kahayan
Written by: Pablo Kahayan and Luis del Toro
Edited by: Luis del Toro and Pablo Kahayan
Additional editing: José Herranz