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External 5 -24 VDC Internal automatic when no signal is present for >20 minutes Power Consumption: 3W Weight: 9 lbs. Dimensions: 1.5"H x 17"W x 11.5"D Finish: matte black anodized front panel, black painted chassis • 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 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. 0-90 0-90 0-180 0-180 Mono LPF LPF HPF HPF LPF HPF HPF 50, 80, 110 Hz 50, 80, 110 Hz Lin LFE in LFE out L HP out L HP out Rin LPF Gain Gain Phase Phase Phase30-220Hz 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 BoundaryStereo Sub Out L Sub Out R • Tower Speakers The X2 can be used to biamplify many different tower speaker models. This includes, but is not limited 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 separate 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. Tower With Stereo Subwoofers AV Receiver or Surround Processor X2 Line Input Line Output Line Input Line Input Line Input Speaker Outputs Speaker Outputs Speaker Outputs Speaker Outputs + + + + + + + + ---- -- - - (Optional) L R High High Tower L Tower R Low Low Amplifier Amplifier Amplifier Amplifier Subwoofer Output Tower With Mono Subwoofers AV Receiver or Surround Processor X2 Line Input Line Output Line Input Line Input Speaker Outputs Speaker Outputs Speaker Outputs + + + + + + + --- -- - - (Optional) L R High High Tower L Tower R Low Low Amplifier Amplifier Amplifier Subwoofer Output • Satellite Subwoofer Systems The X2 can be used to crossover a mono or stereo subwoofer to a stereo satellite system as long as the desired crossover frequency falls into the 50 to 200Hz range. If using a mono subwoofer, three channels of amplification will be needed. If using a stereo subwoofer system, four channels of amplification will be needed. See the following diagram for the proper system wiring when biamplifying with an X2. AV Receiver or Surround Processor Line Output Line Input Line Input Line Input Line Input Speaker Outputs Speaker Outputs Speaker Outputs Speaker Outputs + + + + + ++ + ---- ---- Subwoofer Output (Optional) (Optional) Set to stereo for 2 subs Set to mono for 1 sub (Optional) L R L Sat R Sub R Sat L Sub X2 Amplifier Amplifier Amplifier Amplifier • X2 Active Crossover • Design The NHT X2 active crossover is designed to provide convenient front-panel adjustment of the controls necessary to integrate one or two subwoofer(s) with a Left and Right satellite speaker or to biamp a 3-way tower loudspeaker. The unit has unbalanced RCA and balanced XLR inputs and outputs for connection with all types of receivers or separate audio components. The X2 active crossover can operate as either a mono (single channel) or stereo unit (dual channel). In the stereo mode, you may add an additional subwoofer without purchasing an additional crossover. Two subwoofers can be used for stereo bass (which is desirable for music reproduction) or for additional mono bass reinforcement (for movie soundtracks). Note: Do not use both the unbalanced (RCA) and balanced (XLR) inputs at the same time. The unbalanced (RCA) and balanced (XLR) outputs are buffered separately and may be used simultaneously. • Placement The X2 crossover may be used on a shelf, or in a standard 19" equipment rack using the optional rack ears and hardware. See section 10.3 for instructions on rack mounting the X2. Ideally, the X2 should be placed in close proximity to the receiver or surround processor. Minimizing wire lengths reduces the chance of noise contamination. If long runs (more than 20 feet) of signal wire are required, we recommend using the balanced (XLR) inputs and outputs on the crossover. If you are using the X2 in combination with an NHT A1 amplifier, we recommend that you place the X2 underneath the A1 amplifier. Or, in a stereo configuration, place the X2 between two A1 amplifiers. ...