User manual MCINTOSH XRT1K LOUDSPEAKER

[. . . ] Loudspeaker System XRT1K Owner's Manual McIntosh Laboratory, Inc. 2 Chambers Street Binghamton, New York 13903-2699 Phone: 607-723-3512 FAX: 607-724-0549 WARNING - TO REDUCE RISK OF FIRE OR ELECTRICAL SHOCK, DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE. NO USER-SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED PERSONNEL. To prevent the risk of electric shock, do not remove cover or back. No user-serviceable parts inside. IMPORTANT SAFETY INSTRUCTIONS! PLEASE READ THEM BEFORE OPERATING THIS EQUIPMENT. 1. Clean only with a non-abrasive dry soft cloth. [. . . ] The Woofer also incorporates McIntosh's Patented LD/HP2 Magnetic Circuit Design. Finite Element Analysis and testing resulted in a design concept which utilizes a pair of aluminum shorting sleeves in the magnetic circuit. The sleeves virtually elimi1 COLUMN Pat. No 5, 151, 943 nate the negative influence of the fluctuating voice coil field on the permanent magnet field. This results in lower distortion due to more linear magnetic flux in the voice coil gap. Additional benefits are less volume compression due to improved heat transfer through the sleeves and a cooler operating voice coil. Both measurements, as well as critical Figure 4 listening, reveal ten times less distortion than LD/HP previous designs. A good Conventional example of this low distortion is incredible smoothness and clarity in the reproduction of the human voice. The Crossover Network used in the XRT1K Loudspeaker System is designed Figure 5 to ensure an even frequency response over the entire audible range. The Network utilizes both Second and Third Order design utilizing Capacitors and Inductors with high current Figure 6 capacity. There are two different types of low loss (DCR) Inductors in the network, each one chosen not to exhibit any core saturation even at high power levels. This prevents the addition of distortion to the music at any frequency. The Capacitors used include low loss (ESR) Polypropylene and Mylar types. The Network also utilizes 4 Introduction and Performance Features Performance Features · Patented LD/HP Technology The McIntosh Low Frequency Loudspeaker Elements feature the patented LD/HP Magnetic Circuit Design. This design, when compared to conventional Loudspeaker Elements, reduces distortion significantly. It also increases power handling and efficiency. · Neodymium-Iron-Boron Alloy Magnets The 44 two inch Midranges and 28 three-quarter inch Dome Tweeters all use this Alloy. The Neodymium-IronBoron Alloy has the highest flux density per unit of volume and helps to keep the Column weight to a minimum. Figure 7 · Low Harmonic and Intermodulation Distortion The XRT1K Loudspeaker System is capable of reproducing the full dynamic range of a symphony orchestra with very low audible distortion of any kind. · Large Long Low Frequency Port The XRT1K Loudspeaker System utilizes a very large 6 inch diameter port to increase bass output, reduce distortion and improve the overall efficiency of the Loudspeaker. Figure 8 · High Power Handling The Loudspeaker Elements and Crossover Components of the XRT1K are all chosen for use with powerful amplifiers up to 1, 200 watts. · Superior Imaging Locating the Tweeters between the two rows of Midranges generates a symmetrical horizontal polar response for superior imaging. Figure 9 self resetting high current Poly-Switches to provide an extra measure of protection. The enclosure is an important part of the XRT1K Loudspeaker System. The Loudspeaker System utilizes a massive extruded aluminum enclosure that houses the Loudspeaker Drivers. [. . . ] Remove the metal jumper between the Loudspeaker LOW Frequency 8 (+) Binding Post and MID Frequency 8 (+) Binding Post. Connect a Loudspeaker cable from the XRT1K LOW Frequency COM (-) Binding Post to the (-) Binding Post of the Power Amplifier number one. 5. Connect a Loudspeaker cable from the XRT1K LOW Frequency 8 (+) Binding Post to the (8 ohm) Binding 10 Notes: 1. It is important to maintain the correct polarity at both ends of the Loudspeaker cables. [. . . ]