Compliance in horizontal
and vertical directions
Musical information is recorded in the horizontal direction on mono records. Tracking the vertical
elements will only lead to extraneous noise or potential damage of the record groove. Given
this, the compliance of the XV-1s mono in the vertical direction has been set considerably
lower compared to that of the horizontal direction. A somewhat "thin" and harsh sound
is often experienced when playing a mono record with a normal stereo cartridge. A stereo cartridge
picks up both the horizontal and the vertical groove information so that both the music and
unnecessary noise are reproduced.
Special coil bobbin
The corner of the coil bobbin (armature) of the stereo cartridge is oriented at a 45 degree
angle to the record surface in order to pick up both horizontal and vertical groove modulations.
With the XV-1s mono, the bobbin is rotated to be parallel to the record surface. Therefore,
sensitivity to vertical modulation is reduced dramatically and horizontal modulation is
converted directly to the desired electrical signal. This is the most important feature
of the mono cartridge.
Bifilar wound coil
A typical mono cartridge has two output terminals (hot and ground) with a single coil. The
XV-1s mono has been designed with the four output terminals having bifilar wound coils.
The bifilar wound coil means that dual separate monaural coils are connected respectively
to the left and right channel terminals. As such, a typical stereo phono head amplifier/stereo
phono preamplifier can be used as is without issues of hum, noise or ground loops.
The magnetic circuit design of the XV-1s mono follows directly from the innovative XV-1s
stereo cartridge. Ideal characteristics have been achieved through an unparalleled magnetic
circuit featuring 8 Alnico magnet rods. The XV-1s mono also
utilizes DV's flux damper (patent) that reduces magnetic distortion. This innovative circuit
provides a presentation that is clear, natural and musically expressive like no other cartridge
Stylus tip and cantilever
The cantilever assembly for the XV-1s mono is of solid boron with a line contact stylus profile,
similar to that of the XV-1s stereo cartridge. A line contact stylus profile is unusual
for a mono cartridge, but the depth of grooves remain constant on mono records and the
shape of the groove on mono records is at the same average level found on stereo records.
Properly implemented, a modern line contact stylus can be used with mono records with great
success. As well, the XV-1s mono cartridge will not damage a stereo record due to it's
moderate vertical compliance.