Vox AD120VTX User Manual
6
N
ERDY
I
MPEDANCE
I
NFORMATION
A
HEAD
The following is some information that you’ll find useful for hooking external cabi-
nets up your Valvetronix AD60VTX or AD120VTX combo. When you’re done with
this, you’ll be a smarter and better person! Plus you’ll know the correct way for
hooking up speaker cabinets in series.
nets up your Valvetronix AD60VTX or AD120VTX combo. When you’re done with
this, you’ll be a smarter and better person! Plus you’ll know the correct way for
hooking up speaker cabinets in series.
In multiple speaker cabinet configurations, you will have to use a little mathematics
(Ohm’s law) in order to figure out the correct setting. Don’t worry though; it’s easier
than you might think! The formula below is for hooking up external cabinets up in
series, which is what we’re using here on the VTX amps.
(Ohm’s law) in order to figure out the correct setting. Don’t worry though; it’s easier
than you might think! The formula below is for hooking up external cabinets up in
series, which is what we’re using here on the VTX amps.
Series (AD60VTX & AD120VTX)
In a series configuration, all you do is add the individual impedances of the cabi-
nets. For example, if you hook up two cabinets, where each is 8 Ohms (8 + 8), the
result is 16 Ohms. If one cab is 8 Ohms and the other is 4 Ohms, the total imped-
ance is 12 Ohms. There are no 12 Ohm settings on amps, so set your VTX amp to
16 Ohms.
nets. For example, if you hook up two cabinets, where each is 8 Ohms (8 + 8), the
result is 16 Ohms. If one cab is 8 Ohms and the other is 4 Ohms, the total imped-
ance is 12 Ohms. There are no 12 Ohm settings on amps, so set your VTX amp to
16 Ohms.
R1 is the impedance of our first cabinet; R2 in the impedance of the second one
and R3 is the resulting impedance when they are hooked-up together.
and R3 is the resulting impedance when they are hooked-up together.
R3 = 8 + 8 = 16 Ohms
Specifications
Number of amp types: 16
Number of effects:
Drive types: 10
Modulation types: 5
Delay types: 3
Reverb types: 3
Noise reduction: 1
Modulation types: 5
Delay types: 3
Reverb types: 3
Noise reduction: 1
Number of programs: 32 (8 bank x 4 channel)
Number of inputs:
AD60VTX
Top panel: 2 (High & Low)
Rear panel: 1 x Loop return
Rear panel: 1 x Loop return
1 x Foot controller jack
AD120VTX
Top panel: 2 (High & Low)
Rear panel: 2 x Loop return
Rear panel: 2 x Loop return
1 x Foot controller jack