Vox Stereo Receiver AD120VTX User Manual

Addendum  
 
Introduction  
WELCOME ABOARD AGAIN!  
any thanks for adding a VOX Valvetronix VTX combo to your sonic arsenal.  
We’re sure it’ll give you countless hours of great guitar tones that will feel  
M
as good as they sound! You may have noticed that this is an addendum to  
the original Combo Manual. In this we’ll cover the new NeoDog speakers, new  
cabinet construction, correctly connecting external speakers and the new Imped-  
ance Select Switch for your AD60VTX or AD120VTX combo. Everything else, and  
I mean everything else is already covered in the original Combo Manual... I mean  
Guitarists Guide! So if you’re sitting down, rocking out and have a few questions,  
crack open the “Guide” man! It’s all there... except for what’s here.  
Right. Moving on.You’ll notice that almost all the functions of these combos are  
identical to the original AD60VT and AD120VT combos. So what’s different and  
why am I reading this addendum do you ask? Did you read the above? Speakers,  
cabinets, connecting the speakers and impedance settings, that’s why you’re read-  
ing this! Let’s move on shall we?  
The new AD60VTX and AD120VTX combos both feature newly designed Custom  
VOX/Celestion Neodymium magnet 8 Ohm speakers (dubbed NeoDog) that are  
highly efficient, extremely lightweight and SOUND GREAT.  
In addition to the new NeoDog speakers, we now house them in an all-new up-  
graded ply cabinet for improved tonal balance.  
As if that weren’t enough we’ve also fine-tuned the power section of this amplifier to  
run more efficiently with the new NeoDog speakers.  
On the back panel you’ll also notice the inclusion of an Impedance Select Switch.  
What this does is allow you to hook up external speaker cabinets and maintain  
maximum power. As mentioned the internal speakers are 8 Ohms so when using  
the internal speakers only set the Impedance Selector to 8 Ohms. If and when you  
hook up another cabinet, you have to make sure the external cabinet is either 4  
Ohms or 8 Ohms only. Do not use a 16 Ohm cabinet. Please read below for cor-  
rectly hooking these up.  
IMPORTANT NOTE: DO NOT use an external speaker cabinet with a Wattage rating of  
less than 30 Watts (or 40 watts if you are using a 4 Ohm external speaker cabinet), or less  
than the output power you’ve selected with the POWER SELECT control (see page 19 in A  
Guitarists Guide). If you ignore this, you could end up blowing a speaker— and that’s not  
recommended.  
ANOTHER IMPORTANT NOTE: ALWAYS use speaker cables (unshielded) to connect  
speaker cabinets. NEVER use guitar (shielded) cables.  
3
 
AD60VTX SPEAKER CONNECTION CHART  
Please read the below chart to make sure you correctly connect external speakers  
to the AD60VTX. Keep in mind that the speaker jacks are wired in Series, which  
means that the total impedance of the speakers equals the sum of the impedance  
of the internal (8 Ohms) plus the external speaker (4 or 8 Ohms). As an example,  
the AD60VTX contains an internal 8 Ohm speaker; when you hook up an additional  
8 Ohm speaker, you’ll set the impedance select switch on the back of the amp to  
16 Ohms. 8 + 8 =16. Simple right? Of course it is.  
AD60VTX  
The following chart shows you what speakers you CAN hook up to the AD60VTX.  
Please note that these are the only combinations you can use. Hooking up anything  
other than what’s recommended below can and will cause damage to your amplifier  
and will not be covered under warranty.  
If you use:  
Set Output Impedance of the AD60VTX to:  
One 4 Ohm cabinet (AD212 or AD412)  
One 8 Ohm cabinet  
16 Ohms  
16 Ohms  
One 16 Ohm cabinet  
DO NOT DO THIS  
AD212 or AD412  
Input  
One 8 Ohm cabinet  
4
 
AD120VTX SPEAKER CONNECTION CHART  
AD120VTX  
If you use:  
Set the Impedance of the AD120VTX to: Use Speaker Jack:  
*8 Ohm per side (AD212 or AD412) 16 Ohms  
Left and Right  
Left and Right  
4 Ohm per side  
16 Ohm per side  
16 Ohms  
DO NOT DO THIS!!!  
AD212 or AD412  
Input  
Input  
4 Ohm per side  
*This option is highly recommended! This will make you a rock star. OK, maybe not  
a rock star but you will sound great. If you don’t have this cabinet... you need it. If  
you have it... stop reading and get on with playing your guitar!!!  
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NERDY IMPEDANCE INFORMATION AHEAD  
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.  
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.  
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.  
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.  
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  
Number of programs: 32 (8 bank x 4 channel)  
Number of inputs:  
AD60VTX  
Top panel: 2 (High & Low)  
Rear panel: 1 x Loop return  
1 x Foot controller jack  
AD120VTX  
Top panel: 2 (High & Low)  
Rear panel: 2 x Loop return  
1 x Foot controller jack  
6
 
Number of outputs:  
AD60VTX  
Rear panel: 1 x Loop send  
1 x Phone out  
1 x Line out  
1 x Speaker out (Series connection with inside speaker)  
AD120VTX  
Rear panel: 2 x Loop send  
1 x Phone out  
2 x Line out  
2 x Speaker out  
L ch: Speaker out  
R ch: Speaker out  
(
(
Series connection with inside speaker  
Series connection with inside speaker  
)
)
Speaker  
AD60VTX: CELESTION NeoDog (VOX original) x 1  
AD120VTX: CELESTION NeoDog (VOX original) x 2  
Power output  
AD60VTX: 60 Watts RMS  
AD120VTX: 60 Watts RMS x 2 (L/R)  
Tuning range: A0–C7 (27.5 Hz–2093 Hz)  
Tuner calibration: A = 438–445 Hz  
Signal processing  
A/D Conversion: 20 bit  
D/A Conversion: 20 bit  
Sampling frequency: 48 kHz  
Power supply requirements: AC local voltage  
Power consumption  
AD60VTX: 90 W  
AD120VTX: 175 W  
Dimension (W x D x H) (including protrusions)  
AD60VTX: 530 x 267 x 559 (mm) / 20.87 x 10.51 x 22.00 (inches)  
AD120VTX: 699 x 267 x 559 (mm) / 27.52 x 10.51 x 22.00 (inches)  
Weight (including protrusions)  
AD60VTX: 18 kg / 39.68 lbs.  
AD120VTX: 26 kg / 57.32 lbs.  
Accessories  
Included: Power cable  
Optional: VC-4 Foot controller, AD212/AD412 Extension speaker cabinet  
*Specifications and features are subject to change without notice  
FOR MORE INFORMATION ON VALVETRONIX AMPLIFIERS PLEASE VISIT  
WWW.VALVETRONIX.COM  
7
 
 

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