NHT X2 User's Manual
Contents
1. Low E 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 ampli fication will be needed See the following diagram for the proper system wiring when biamplifying with an X2 AV Receiver or Surround Processor Line Output CS i Subwoofer R m Set to stereo for 2 subs Set to mono for 1 sub Optional rossove m PUSH NEN 68 Mode B e ae a y ie L Nu Stereo Mono 2 cmm Ts Tum n g 7 e e ne ne e I k WA WH u ower Input u Sub P Out R AC 15V High Pass Filter RCA Input XLR Input 0 dB 10427 l S50H2 Man Pass High Pass gt Optional Amplifier Amplifier Amplifier Amplifier Speaker Speaker Speaker Speaker A Nd Ei S Q L Sub Optional B X2 Active Crossover B 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 c2. X2 tive Crossover ER S MANUAL Now Hear This 6400 Goodyear Road Benicia CA 94510 800 NHT 9993 Specifications X2 Active Crossover Frequency response 15Hz 220Hz 3dB through L R input continuously variable 15 220Hz 3dB through LFE input fixed 50 80 110Hz 100KHz 3dB Distortion lt 0 01 subwoofer output 100Hz 1V lt 0 001 hi pass output 1KHz 1V Signal to noise ratio gt 105dB at Hi pass output gt 100dB at subwoofer output Crossover Low pass continuously variable between 30 220Hz 12dB octave Low pass fixed at 220Hz 12dB octave High pass selectable between 50 80 110Hz 12dB octave Input connectors Gold plated RCA jacks for L and R line level input XLR jacks for L and R line level input Gold plated RCA jack for LFE input XLR jack for LFE input Detachable terminal block for external trigger in thru 2 1mm x 5 5mm x 9 5mm power connector Output connectors Gold plated RCA jacks for L and R line level high pass output Gold plated RCA jack for LFE thru XLR jacks for L and R line level high pass output Gold plated RCA jacks for L and R line level sub woofer output XLR jacks for L and R line level subwoofer output Phase Control Variable between 0 and 90 degrees Switchable 0 180 degrees Gain Control 10dB and OdB subwoofer input sensitivity Stereo Mono Switch Stereo or mono subwoofer operation Standby Mode Selectable internal and external External 5 24 VDC Internal automatic when
3. The Boundary EQ control allows you to compensate for the effects of room boundaries on the frequency response of the subwoofer Adjusting the control enables you to achieve smooth low frequency output from the subwoofer regardless of its location in your room The following diagrams show the correlation between sub woofer placement and Boundary EQ These diagrams are guidelines only Your room acoustics and personal tastes will ultimately dictate the final setting Boundary EQ 0 3 LON E 6 Boundary EQ 0 Boundary EQ 0 e 4 6 Boundary EQ 0 3 44A 3 x 6 6 Boundary EQ 0 o 4X 3 E 6 6 E System Status Indicators Front Panel Located on the right hand side of the front panel are two LEDs They are used to indicate the func tional status of the X2 Crossover P Power LED green indicates the X2 is on and in a ready condition o Standby LED amber indicates the X2 crossover is in standby mode 8 5 Fine Tuning Chart The chart below was developed to assist you in the further fine tuning of your subwoofer or tower sys tem Should you be unable to achieve satisfactory performance from your subwoofer system using the fine tuning chart contact your authorized NHT dealer or call our Customer Hotline at 1 800 NHT Boomy Too Much Mid Upper Bass Adjust Subwoofer Phase 0 90 Continuously dd Lower Low Pass X Over Frequency Lower Adjust Subwoofer Subwoofer
4. Adjust Subwoofer Closer to Volume Subwoofer Volume Wall v Volume v Y Adjust Subwoofer Phase Fine Tuning Flow Chart Lacks Mid Upper Bass Lean But With Weight Adjust Subwoofer Phase 0 90 Continuously Adjust Subwoofer Phase Switch Increase Boundary EQ If this makes it worse try gt If the sound improves Raise Low Pass Setting Y Excessive Low Bass Weight Decrease Boundary EQ Move Subwoofer Farther From Wall Y Limited Warranty Valid Only in the U S A Warranty Period For the period of 5 years for parts and 5 years for labor from date of original purchase the warranty period from an author ized NHT dealer Now Hear This NHT warrants that if our product fails to function properly under normal use due to a man ufacturing defect when installed and operated according to the owner s manual instructions enclosed with the unit it will be repaired or replaced with a unit of comparable value at the option of NHT without charge to you for parts or actual repair work Parts supplied under this warranty may be new or rebuilt at the option of NHT What s Not Covered This warranty does not cover any product which is used in any trade or business or in an industrial or commercial applica tion This warranty does not cover the cabinet or any appearance item or any damage caused to the product resulting from alter ations modifications not authorized in writing by NHT acc
5. 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 Tower With Stereo Subwoofers AV Receiver or Surround Processor Line Output Subwoofer Output Stereo Mono a ig M M a Tz R Trigger Nu ux D am ie r a r a E E ERES in THA High Pass Filter Sub Power Input Amplifier Amplifier Amplifier Amplifier Line C Speaker Outputs QQ Speaker Outputs XQ Line cR Speaker Outputs OP peaker Outputs E Tower With Mono Subwoofers AV Receiver or Surround Processor Line Output Subwoofer Output Optional Ext Trigger 4 e k In Thru 12V igh Pass Filter r Trigger ode But NN On Audio 12V Ext Hi Pass ub 1048 dB LFE In ut ut Out UR AC 1 Nu Amplifier Amplifier Amplifier Line cm Speaker Outputs D Speaker Outputs Speaker Elo QR
6. no signal is present for gt 20 minutes Power Consumption 3W Weight 9 Ibs Dimensions 1 5 H x 17 W x 11 5 D Finish matte black anodized front panel black painted chassis E 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 LFEin ee Pe B LFE Gain LFE out 50 80 110 Hz lie a L AT ba HPF gt QC Master Gain HPF B 30 220Hz Phase Phase Gain 0 10dB 20Hz Boundary 200 Hz e Dal essi err HO HSH AH Se t B E AU Hi LPF Mono LPF b 30 220Hz Stereo Boundary 200 Hz e 1 ES s eH HH sr 9 v cm A l LPF Phase Phase Master Gain 20 Hz LEF Gain 0 10dB HPF 50 80 110 Hz N E L a HPF gt O B 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 VI2 VI2 4 VT 1 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
7. e sure that your X2 controls are initially set as described in Section 7 before continuing Power Standby Mode Rear Panel Your X2 crossover does not have a power switch but has been designed with the ability to turn itself on and off under various conditions There are three methods for triggering the X2 On the rear panel of the X2 is a 3 position switch that determines the trigger mode 1 On the X2 is always on 2 Audio the X2 will automatically turn on when it detects an audio signal and turn off after 20 min utes with no signal 3 12V Ext the X2 is remotely turned on when it detects a DC control signal from another com ponent in your system The external trigger accepts 5 24 volt DC signals For more information regarding external triggers consult your authorized dealer Master Gain Front Panel Master Gain The Master Gain control allows you to adjust the volume of the subwoofer relative to the satellite soeakers Use the Master Gain judiciously A properly calibrated sub woofer blends seamlessly with the satellites without calling attention to itself Here are some general guidelines for setting the Master Gain control Begin by playing some stereo music you are familiar with Set your AV Receiver or Surround Processor volume to a comfortable listening level Slowly increase or decrease the Master Gain on the X2 crossover listening for a natural frequency balance between the subwoofer and the front left and
8. ident misuse or abuse damage due to lightning or power surges or being subjected to power in excess of the speaker s published power rating This warranty does not cover the cost of parts which would otherwise be provided without charge under this warranty obtained from any source other than an authorized NHT service location This warranty does not cover defects or damage caused by the use of unauthorized parts or labor or from improper maintenance Altered defaced or removed serial numbers void this warranty Your Rights The liability of NHT will be limited to the purchase price of the product and NHT will not be liable for incidental or consequential damages NHT limits its obligations under any implied warranties under state laws to a period not exceeding the warranty period Some states do not allow limitations on how long an implied warranty lasts and some states do not allow the exclu sion or limitation of incidental or consequential damages The above limitations or exclusions may not apply to you This war ranty gives you specific legal rights and you may have other rights which vary from state to state To Obtain Service NHT has appointed a number of authorized service companies throughout the USA should your product ever require service To receive warranty service you will need to present your sales receipt showing place and date of original owner s transac tion To find the name and address of the nearest authorized NHT ser
9. omponents 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 addi tional mono bass reinforcement for movie soundtracks Note Do not use both the unbalanced RCA and balanced XLR inputs at the same time The unbal anced RCA and balanced XLR outputs are buffered separately and may be used simultaneously B 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 The A1 s are equipped with lamps under the front edge which illuminate the X2 controls See section 9 2 for more detail B X2 Features and Controls This section describes the various controls and functions of the X2 Mak
10. right satellites When properly balanced you will hear natural bass extension without being aware that it is coming directly from the subwoofer Once the Master Gain is set the volume control on your AV Receiver or Surround Processor will con trol the volume of your entire system including the subwoofer LFE Gain Control Front Panel LFE Gain LFE is short for Low Frequency Effects Low Frequency Effects originally were low frequency sounds added to movie soundtracks in order to increase their impact For consumer electronics there is no standard concerning what type of signal might be present on the LFE channel Therefore we have added an LFE input and gain control to the X2 so that you can integrate whatever is present on the LFE channel with the Signal being reproduced by the rest of the system After you have set the Master Gain level as described above play a multi channel signal through your system as from a movie Sources with lots of bass output will be the most useful Adjust the LFE gain control until the bass produced by the subwoofer reaches the desired level Most users initially set the level of the LFE gain control at too high a level so be prepared to adjust the control over a long period of time You have reached an appropriate level setting when movies soundtracks have impact and music sources have punchy bass but the overall character of the bass produced by the subwoofer is not thick and ill defined The le
11. sound quality out of the system Begin by set ting the phase knob at 0 alternating the switch position between 0 and 180 From the listening posi tion choose the switch position that yields the most bass output and leave the switch in that position Then use the knob to fine tune the phase setting Slowly twist the knob listening for the point at which the bass at the listening position is the loudest Small changes in phase generally produce subtle changes in bass output You may have to adjust the knob now and again over a period of a few weeks to find the best setting for your listening room Gain Switch Rear Panel Gain The Subwoofer Gain switch allows you to increase the gain of the X2 subwoofer output y l by 10dB Normally the factory default 0 position will give you a wide range of volume E adjustment However if the sensitivity of your satellite speakers is greater than 93dB your range of volume adjustment on the X2 may be limited In this case set the Gain Switch to 10dB Boundary EQ Front Panel Reflective boundaries such as walls reinforce a speaker s bass output 3dB for two walls 6dB for a corner if the sub woofer is placed near them Conversely placing a subwoofer out in the room results in a relative decrease in bass output Boundary reinforcement may lead to low frequency response that is uneven Some frequencies will sound exaggerated rel ative to others or the subwoofer will sound thin and lack impact
12. st the Low Pass Filter to approximately the same setting as the High Pass Filter as a starting point Adjust the Low Pass Filter in small increments up or down until the blend between the subwoofer and your main speakers is seamless and the subwoofer does not call attention to itself Music featuring male vocals cello and acoustic bass bass guitar and certain wind instruments like saxophone and trombone is useful for setting the low pass frequency Phase Controls Front Panel The Subwoofer Phase switch and continuously variable knob change the phase of the subwoofer output anywhere from 0 to 270 relative to the high pass output Proper subwoofer phase is important to achieve smooth bass response An improper phase setting causes dips in the frequency response of the combined subwoofer satellite system at the listening position The result of these dips is low frequency production that is very deficient at certain frequencies and a lack of seamless integration between the satellites and subwoofer The optimal phase setting will vary depending on room conditions and placement While fine tuning the phase setting have a familiar stereo CD available You should listen to the same song while alter nating phase settings Find the best setting while sitting at the primary listening position The initial settings described in Section 7 provide a good starting point for your system However experimentation is the key to getting the best possible
13. vel of the signal on the LFE channel varies considerably from source to source so you may need to adjust the LFE control on the X2 depending on the source material There is an LFE Thru output on the back of the X2 For more information concerning the use of this output visit our website www nhthifi com technicalhelp evolution High Pass Filter Switch Rear Panel The High Pass Filter determines the range of frequencies that the main speakers satellites will reproduce For example a high pass setting of 80Hz means that the main speakers receive a signal containing only frequencies above 80Hz The 3 positon High Pass Filter is selectable between 50Hz 80Hz and 110Hz to accommodate a vari ety of speaker sizes High Pass Filter 10H24 50Hz 80Hz Set the High Pass Filter to a frequency above the rated low frequency limit of the main speakers For example if your speakers have a rated low frequency response of 40Hz use the 50Hz high pass set ting If your speakers have a rated low frequency response of 90Hz use the 110Hz high pass setting Check the owner s manual for their rated low frequency response Low Pass Filter Control Front Panel Low Pass 50 The continuously variable Low Pass Filter determines the range of frequencies produced by the subwoofer For example a low pass setting of 100Hz means that the subwoofer reproduces only frequencies below 100Hz The LFE input is not affected by this control Adju
14. vice location call or write Customer Service Department NHT 6400 Goodyear Rd Benicia CA 94510 1 800 NHT 9993 648 9993 www nhthifi com Keep this warranty with your sales receipt Record date and place of purchase for future reference
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