NHT Music Series 1.5 User's Manual
Contents
1. Loudspeaker OWNER S MANUAL q Now Hear This 6400 Goodyear Rd Benicia CA 94510 800 NHT 9993 Thank you for your purchase of the NHT Model 1 5 our finest two way loudspeaker Please take a few minutes to read through this Owner s Manual prior to installing your new speakers The information provided will help you to obtain maximum performance from your audio system If you have questions or need assistance at any time during the installa tion or operation of your new speakers please call your NHT Dealer or our Toll Free Customer Hotline at 1 800 NHT 9993 Please retain the Model 1 5 s packaging to protect the speakers in the event that you move or transport them Model 1 5 Specifications System Type 2 way 10 liter acoustic suspension design Focused Image Geometry Driver Complement 6 5 long throw polypropylene woofer 1 fluid cooled aluminum dome tweeter Crossover 3 3KHz 12dB octave high pass and low pass Response 53Hz 25KHz 3dB Sensitivity 85db 2 83V at 1M Impedance 8 ohms nominal 6 2 ohms minimum Recommended Amplifier Power 20W ch minimum 150W ch maximum Inputs 5 way binding posts Weight 16 lbs each Dimensions 16 5 H x 7 W x 10 25 D Finish High gloss black mahogany or sycamore laminate Specifications are subject to change without notice in accordance with our policy of continuously upgrading the performance of our products E Design NHT loudspeaker2. actual drivers 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 authorized NHT dealer Now Hear This NHT warrants that if our product fails to function properly under normal use due to a manufacturing 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 war ranty 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 application This warranty does not cover the cabinet or any appearance item or any damage caused to the product resulting from alterations modifications not authorized in writing by NHT accident misuse or abuse damage due to lightning or power surges or being sub jected 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 o
3. an 18 inches from a television Unshielded magnets placed in close proximity to a television screen can cause discoloration of the picture If you notice picture discoloration move the speakers away from the TV until the problem disappears The most impressive performance benefit of Focused Image Geometry is spectacular imaging and an expansive soundstage To achieve this in your home we recommend that the Model 1 5 s are placed on rigid speaker stands approx imately 22 inches high situated at least 12 inches from the rear wall behind the speakers and at least 30 inches from the side walls For smoothest response the distance from the side walls should be different than the distance from the rear wall Preferably use spikes or cones to firmly couple the speaker to the stand and the stand to the floor Optionally the Model 1 5 s may be placed on a shelf or in a cabinet however this placement will have a detrimental effect on the sound For best results place the speakers flush with the front and not pushed back on the shelf The 1 5 s should be placed as symmetrically as possible with their backs parallel to the rear wall and the drivers facing the listening area without obstruction from furniture The tweeters should be at equal height and at approximately ear level to ensure accurate response Arrange the speakers so that the distance between the listener and the center of the speaker plane is 1 5 times the distance between the two speake
4. ange response Focused Image Geometry is the heart of NHT s successful line of high performance audiophile loudspeakers Borrowing technologies from NHT s acclaimed flagship Model 3 3 the Model 1 5 employs custom designed European drivers includ ing an offset aluminum dome tweeter that boasts extremely smooth response even at high listening levels The Model 1 5 features a 6 5 long throw woofer that is the result of extensive in house development and is custom manufactured for precise rolloff and radiation characteristics With the increasing popularity of home theater systems many audio video enthusiasts are building combined entertain ment systems for both music and movies When the Model 1 5 is used in a home theater system be sure to augment it with timbre matched speakers to ensure a seamless soundfield The NHT AudioCenter 1 is the appropriate matching center channel speaker and a second pair of Model 1 5 s is the ideal match for the surround channels Alternately the NHT HDP 2 hybrid dipole can be used as a surround speaker in rooms where the couch is against the rear wall a e D S lt __ Speaker Center of A A Plane Speaker we Plane gt lt 1 5xD E Placement The compact size and angled shape of the Model 1 5 allow it to be placed on speaker stands or on shelves The Model 1 5 is designed for indoor use only As the Model 1 5 is not a magnetically shielded loudspeaker do not place it closer th
5. d for runs of 10 feet or less with heavier special purpose speaker wire used for longer runs For specialty wire considerations consult your local authorized NHT retailer For best results use equal length runs of wire for the left and right speakers Prepare your speaker wire by stripping 1 4 to 3 8 of insulation from the ends and twisting the exposed wire strands tightly The five way binding posts on the back of the speaker will accept raw wire banana plugs or spade plugs Tighten the binding posts by hand as pliers can strip or break them Be sure to wire both the left and right speakers in phase That is the Positive red terminal on the amplifier output must be connected to the corresponding Positive red terminal on the speaker Likewise with the Negative black terminals All speaker wires have some sort of marking along one or both conductors to help you make the correct connections Incorrect speaker phase is indicated by weak bass and the lack of a well defined stereo image 3 To minimize noise pickup segregate cables by function Do not run low level signal cables parallel to power cables speaker cables or digital cables Also do not run speaker cables or digital cables parallel to power cords or parallel to each other If different types of cables are placed near each other at some place in your system separate them by the maximum practical distance and cross them at right angles where they meet Do not twist or tie AC po
6. r 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 exclusion or limitation of incidental or consequential damages The above limitations or exclusions may not apply to you This warranty 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 transaction To find the name and address of the nearest authorized NHT service location call 800 NHT 9993 or write NHT 6400 Goodyear Road Benicia CA 94510 Keep this warranty with your sales receipt Record date and place of purchase for future reference Rev 3 99
7. rs Fig 1 This configuration puts the listener in the center of the stereo image Experimentation is the key to finding the best arrangement in your particular listening environment Be patient have fun and remember that small changes in speaker position can sometimes have a significant effect on the sound For example moving the speakers nearer to a room boundary walls corners will tend to increase their bass output but may result in boomy or muddy sound Conversely situating the speakers farther away from room boundaries will tend to decrease their bass output but may result in greater articulation and better imaging In addition room furnishings play an important role in absorbing and reflecting soundwaves Midrange and high frequen cies in particular will be absorbed by soft furnishings such as sofas carpets and curtains A large number of these soft fur nishings will dull the sound while a live room with few furnishings will brighten the sound If you are willing to spend some time fine tuning the performance of your system you will enjoy the benefits for years to come E Connections Before connecting speakers to your system it is important that you turn off the power to your amplifier receiv er to avoid damage to the equipment The Model 1 5 loudspeaker system is compatible with virtually all quality amplifiers Proper wiring of the speakers is essential to good sound At a minimum 16AWG wire is recommende
8. s are designed to deliver refined musical sound from attractive and affordable packages Our efforts are guided by the study of human hearing and are optimized for real world use Every NHT speaker undergoes rigorous testing and quality control at the factory to ensure you years of listening pleasure Incorporating NHT s proprietary Focused Image Geometry design the Model 1 5 s custom designed drivers and enclosure achieve a level of tonal neutrality and imaging precision unsurpassed at the price Focused Image Geometry determines the 21 degree angle which defines the 1 5 s unique cabinet as well as the sound radiation pattern of the system The irregular enclosure shape greatly increases the ratio of direct to reverberant sound reducing side wall reflections and concentrating sound energy in the listening area The exact angles at which the sound from the speakers reaches the ears of centrally located listeners is calculated to create what is known in acoustics as minimum inter aural cross correlation This technique allows the Model 1 5 to properly recreate the natural acoustic ambiance and perspective contained in good recordings In addition the radiating axes of the left and right speakers are crossed providing time intensity trading so that the stereo image remains focused and stabilized for a wider range of listening positions Finally the cabinet shape also reduces the formation of internal standing waves resulting in smoother midr
9. wer cords with speaker cables E Operation The Model 1 5 was designed to handle a wide range of listening levels but every speaker has limits It is important to use common sense and listen for signs of possible distress from the speakers Underpowered amplifiers are most often the cause of speaker damage For example a 60 watt amplifier runs out of power when called upon to produce more than 60 watts and the resulting distortion can damage the speaker If you tend to listen at high volume levels more powerful amplifiers are preferable because they are less likely to run out of power Noticeable distortion or harsh breakup is an indication that either your amplifier or your speakers are running beyond their capacity and the volume should be decreased If you can feel any heat emanating from the woofer or tweeter reduce the level immediately Speaker damage most often occurs from sustained high volume levels not from transient sounds or brief musical peaks Excessive boosting of bass treble or equalizer controls can worsen the problem and is not recommended E Maintenance Your speakers require minimal maintenance under normal use The cabinet may be cleaned using a damp cloth or a mild non abrasive cleaner To clean the grille first remove it from the speaker then brush lightly with a soft brush or use a vacuum on its lowest setting Do not expose the speaker to direct sunlight high temperatures or moisture Do not attempt to clean the
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