NHT X2 User Manual
Page 3
Block Diagram and Schematic
Below is a block diagram of the X2 crossover. This may be useful when integrating the X2 into your
system. A schematic of the X2 is available on our website at www.nhthifi.com. This may be useful if
you wish to modify any of the filter characteristics in the X2. This is only recommended for users with
the correct technical training and will completely void your warranty.
Tower Speakers
The X2 can be used to biamplify many different tower speaker models. This includes, but is not limit-
ed to, the NHT M3.3, M2.9, M2.5, M2.5i, VT2, VT2.4, VT1.2 and VT1.4. Basically any tower speaker
with a subwoofer to woofer crossover frequency between 50 and 200Hz can be biamplified with the
X2. The tower speaker must also have separate inputs for the subwoofer (low frequency) and woofer
(high frequency) section. Any jumper straps connecting these two sections must be removed, or
severe damage may occur to the amplifers driving the speakers. Tower speakers that do not have sep-
arate low and high frequency inputs may be biamplified with the X2 provided the speaker crossover is
modified to have separate inputs. Consult your speaker manufacturer for assistance. If driving the sub-
woofers in parallel (mono), three channels of amplification will be needed. If driving the subwoofers
separately (stereo), four channels of amplification will be needed. See the following diagrams for the
proper system wiring when biamplifying with an X2.
0-90
0-90
0-180
0-180
Mono
LPF
LPF
HPF
HPF
LPF
HPF
HPF
50, 80, 110
Hz
50, 80, 110
Hz
L in
LFE in
LFE out
L
HP out
Sub Out
L
Sub Out
R
L
HP out
R in
LPF
Gain
Gain
Phase
Phase
Phase
30-220Hz
30-220Hz
Phase
Master
Gain
LFE
Gain
Master
Gain
200 Hz
200 Hz
20 Hz
0, 10dB
0, 10dB
20 Hz
Boundary
6
6
-6
-6
Boundary
Stereo