A highend multi talent passive box for dynamic, electrostatic and magnetostatic headphones
Of course VERTO is capable of using a high end transistor output amplifier any type of headphones - dynamic, magnetostatic and electrostatic adapt. More equipment is not
required to. Use a speaker cable and connect Verto`s golden speaker terminal to the output terminals on your transistor amp and enjoy your STAX headphone in Mode EST ( right position )
The headphone market is growing. There are exciting new high
end models available. But one thing remains unchanged - STAX headphones are
still one of the most appealing offers in the high end market. STAX is astrong brand with a long history. And we are convinced also with a bright
future. Many audiophiles regard the SR-007 and SR-009 as the best headphones in
So what about the amplifier
offerings for STAX headphones? In case of a dynamic or planar headphone you
have the choice, new headphone amps are announced every month. For STAX the
market is different. You can choose the simple way and just order a STAX headphone
amplifier. If you don`t like their sound, you tend to prefer something individual
or look for one headphone amplifier driving your collection of STAX and also dynamic
models the amount of options is very limited. Based on web research you will
find a very few and also very expensive high end especially in the US market -
often without distributors for other regions.
But who is offering a heaven`s gate model which is
affordable and which can be used also for dynamic models ? This gap is now
filled by our new electrostatic STAX box called VERTO - design and produced by AudioValve.
The passive box can be used together with AudioValve RKV
II and RKV III tube based headphone amplifiers. There was a simple idea behind
the VERTO. Why not use the transformer in step up mode to produce the high
voltage for the STAX electrostatic headphones? The RKV models use one
transformer per channel (impedancer) to drive low impedance headphones (<
100 Ohm). In the RKV III the transformers are mounted inside the case, for the
RKV II the impedancer can be bought as a separate box. RKV II and III are
regarded to belong to the best sounding headphone amps regardless of price, see
many reviews all over the world.
For a game changing product a simple idea is not enough,
you have to find also a proper implementation. There are already promising
approaches in the market combining transformers with headphone amps to drive STAX
headphones. But RKV and VERTO are now exploiting the full potential of that
approach. Inductance and capacitance of the transformer can harm the sound. The
Pikatron output transformers we use have only very little stray inductances and
capacitances. To avoid distortion we use only a low step up ratio of 1 to 5.
But key is the fact that the output impedances of RKV II and III are extremely
low, too low to cause any negative effect on the sound.
The VERTO supports the current STAX PRO plug with 580 V DC bias as well
as the former bias of 300 V used by older STAX headphones. The higher PRO bias uses
a 5 Pin connector, the 300 V DC bias can be identified by a 6 Pin headphone
plug at the end of the headphone cable. So the VERTO is suitable for all STAX models.
The VERTO has is connected to the
headphone amp with a phone cable and standard plug coming with the VERTO. There
is nothing to buy for you in addition to the VERTO. Also the VERTO does not
require a separate supply voltage. This ensures that there is no interference
and hum caused by main connection. The RKV III has to be switched to the OTL
mode when driving the VERTO.
To increase the versatility we
implemented a switch for 8 ohm as well as 32 ohm. So you can connect high
efficient loudspeakers as well as headphones with low impedance. Feel free to drive
mobile headphones designed for Apple devices as well as low impedance high end planars
like Audeze or Abyss. Check to drive your high efficient
loudspeaker with your tube and transformer based RKV and VERTO chain!
Since the connection of the VERTO to the headphone amp is implemented
via a standard phone plug you can use it also with other headphone amps instead
of the RKV II and III. You will achieve very good results in the case you use a
headphone amp with low output impedance and a high output voltage. We doubt
that you will get to the same ultimate sonic quality as with the RKV models. The
RKV II and III are able to deliver 100 volts peak-peak drive.
use only high quality
components in the box. The Picatron transformers are built based on our
specifications. For wiring the main audio connections to the sockets of
the headphones and the STAX female socket cable we use a well-known
German high end audio cable manufacturer by the name of HB cable design
from Cologne. The core of the cable is made of silver-plated oxygen-free
copper conductors stranded several times.
| How to setup the AudioValue VERTO to achieve true
high-performance from your Dynamic, Planar Magnetic and Stax headphones from one
Helmut Becker of AudioValue has designed a
unique passive device called the VERTO. The VERTO will allow you to use
your existing components and setup one system that will be capable of driving
your dynamic, planar magnetic and electrostatic headphones to peak
The VERTO is a passive device (no power
supply required) powered by the signal from the power amplifier. This allows the
VERTO to be transparent as it will
yield the true sonic signature of the power amplifier and other components you
use in the system.
This is a huge advantage over dedicated
amplifiers for your Planar Magnetic or Stax headphones as they can be very
costly and many are overpriced yielding less than optimal performance.
But with the VERTO you have no limit as you
may use it with your favorite high-performance power amplifier(s) and other
components to achieve superb results
driving any type of headphone.
Below is my recommended system setup with
the VERTO. In this configuration there are no sonic compromises in terms of
which headphones you use with the system as Dynamic, Planar Magnetic and
Electrostatic headphone all perform superbly.
First off, to achieve the absolutely top
performance from the VERTO and the rest of the components in your system it is
extremely important to use vibration control and properly designed system cables
for all the components in the system. These two very important and over-looked
“components” will for lack of a better term “double or “triple the capabilities
of the collective components very notably improving the overall system
See the following information on the www.mapleshaderecords.com
The large front Mode Knob on the VERTO allows you to change the impedance
depending on the design of the headphones (Dynamic, Planar Magnetic or
8R (8 ohm resistance) is for Dynamic
32R (32 ohm resistance) is for Planar Magnetic
ESH (Electrostatic Headphones) is for the Stax
or similar headphones.
With rigorous testing I have determined that the
VERTO drives the Stax and the higher impedance HiFiMan HE5/6/1000 and Audeze
headphones extremely well when both types of headphones are set to the ESH setting. With the HiFiMan and Audeze
headphones, it is somewhat splitting hairs as they still sound great on the 32R setting (the intended planar magnetic
headphone setting) but I eventually heard slightly better dynamics with them on
the ESH setting. Try both as you may find both to be
equal or the 32R setting better suited for the planar magnetic headphones you
use in your particular system.
Another important aspect of the VERTO I have
learned while testing is the lower impedance Audeze headphone and all the
Dynamic headphones did perform better than when connected to the VERTO when
instead using a high quality headphone amplifier (which can produce 1 watt or
more of output) connected to the pre-amp outputs of the high quality integrated
tube or SS power amplifier – the same amplifier in which the speaker outputs are
connected to the speaker inputs on the front panel of the VERTO.
So here is my recommended setup based on
extensive testing of all the combinations available from the front panel of the
- Choose and use any source(s) you prefer:
CD, Vinyl, Streamer, Reel to Real etc.
- Connect your source(s) to one high- performance integrated tube or
solid state power amplifier.
- Use the speaker outputs of the integrated
power amp you have chosen and connect your speaker cables to the speaker inputs on the front
panel of the VERTO.
- Your system is now setup so you can
connect your high impedance Planar Magnetic and the Stax headphones to the front panel of the VERTO.
The volume will be controlled by the integrated power amplifier.
- Now use your
headphone amp to drive all your Dynamic and low impedance Planar Magnetic Headphones by doing the
following. If your integrated
amplifier you have chosen for use with the
VERTO has a tape output, connect
your headphone amplifier with
interconnects to the tape outputs and use the volume control of the headphone
amp. to make volume adjustments. If your integrated
amplifier does not have a tape output, connect
your headphone amplifier with interconnects to the preamp. outputs of
the integrated power amplifier. If
you are using the preamp outputs, set the volume control on the integrated amp.
at a low setting and control the volume by the headphone amplifier volume
- Now connect your headphone amplifier with
interconnects to the preamp. outputs of the integrated power amplifier you have chosen for use with the VERTO.
Use your headphone amp to drive all your Dynamic and low impedance Planar Magnetic Headphones.The volume can be controlled by the
headphone amplifier and/or the integrated power amplifier.
You can try any headphone amp. you prefer
(other than one that produces an output of 1 watt or higher) and test the
results as the performance of this headphone amp. in your system might prove to
be excellent as well.
recommendation from our US dealer and reseller for AudioValve headphone products: call James from: email@example.com
Verto - that universal genius - can
6 different mode.
low impedance magnetostatic / dynamic headphones
1) 6.3 mm jack at RKV in mode 1 or 2 on VERTO
6.3 mm jack plug and an adapter cable and connect to any large and small transistor amp ( VERTO mode 1 or 2 )
3) the 6.3 mm jack in RKV and speakers connecting at the speaker terminals of VERTO ( VERTO mode 1 )
electrostatic headphones ( generation of the bias voltage independently )
4) the 6.3 mm plug to RKV model 2 + 3 ( VERTO mode 3 )
the 6.3 mm jack plug in an adapter cable to a large transistor amplifier ( VERTO mode 3 )
6) reverse mode - in to the
speaker terminals from VERTO connected by a transistor amp ( VERTO mode 3)
Specification: The device provides both required
static voltages of 300 / 580 VDC for the operation of all STAX headphone models
and up to 550 Vrms signal voltage
VERTO model versions:
VERTO, standard - 690, - EUR
VERTO HB 990,
- EUR ( highend HB-CABLE DESIGN configurated )
mm standard adapter
cable to connect to transistor output terminals, length 1,5m - price: 92,- EUR
6.3 mm HB Cable Design highend adapter cable for
connection to transistor output terminals, length 1,5m - price: 398.- EUR
1, 5 meter - four wire 1.5mm2 OFC copper
speaker wire with 8 bananas for connecting the speaker terminals of a transistor amp to Verto - price: 95,- EUR
- Compatible with all STAX
electrostatic headphones (580 V DC PRO bias 5 Pin connector as well as 6 Pin
300 V DC bias)
- Suitable for low and middle
impedance dynamic or planar headphones as well as ultra high efficient
- 3 switchable modes for STAX electrostatic
mode, 8 ohm and 32 ohm
- One Teflon female jacket for
STAX PRO bias 5 Pin and 6 Pin headphones
- Two Combi jackets phone plug
and XLR for dynamic and planar headphones
- Loudspeaker terminals to
connect spades or bananas
- 60 cm cable with phone plug
fixed to the case for connection to the headphone amp (like Audio Valve RKV II
and III as well as other headphone amps with low output impedance and high
- No separate supply voltage
needed, static high voltage is generated by the signal
- One high quality Pikatron
output galvanic coupled transformer for each channel
- Internal bias voltage for
STAX 300 + 580 VDC (LED controlled)
Internal HB cable design with a cross section of 0.72 sq. mm, embedded
in a PTFE Teflon insulation air. The conclusion is a 5 mm diameter
strong silicon of insulation, the high-voltage signal line outwards
reliable and well insulated
- The device provides both the
required for the operation of the headphone-static voltage of 300 / 580 VDC,
and up to 550 Vrms signal voltage
- Bandwidth up
to nearly 100 KHz - ( 470 pf load )
- Dimensions: w * h * d ( cm ) - 110 * 105 * 165
- weight: 2 kg
- Silver case (black on
- Chrome mode switch (golden
- Cable with phone plug 60cm
length (different length on request)
- Price: 690,- EUR including VAT
pic 1 -
show you the excellent transmission properties of the VERTO used on a STAX headphone connected to the output of the
RKV Mark 2 as driver.
pic 2 -
show you a triangle signal by 10 kHz
pic 3 -
When you connect the speaker terminals
to any transistor amp in reverse mode you can use STAX headphones