H ™ e l o s u s e r ’ s TM 20 m a n u a l M a r t i n L o g a n® the loudspeaker technology company
Contents and Introduction Contents Contents and Introduction . . . . . . . . . . . . . . . . . . 2 Contents Introduction Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Painting and Customizing . . . . . . . . . . . . . . . . . . .
Placement — Place the Helos 20 at least 12" (30cm) from any wall. — When used as a front channel, place it between 7 to 10 feet (214 to 315cm) from the primary listening position. Figure 1. Stereo mode in a 2-channel system. Figure 2. Stereo mode in a small space. — Point the tweeters towards the primary listening position. — When using the Helos 20 for distributed audio place the speakers symetrically throughout the room. Figure 3. Stereo mode reproducing both the left and right surround channels.
Installation NOTE: These instructions must be carefully followed to assure that your Helos 20 is safely installed. Study them thoroughly before installing your Helos 20. NOTE: The following instructions assume the mounting surface is of standard wood frame and standard sheet rock construction. If you wish to mount the Helos 20 to another type of material, you should consult a bonded contractor. Warning! Before installing check local building codes to verify compliance with local regulations.
Ceiling Joist Ceiling Joist Figure 10. Installation steps 1–3. Figure 11. Installation step 4. 1 4 Using a stud finder, locate the final speaker position between ceiling joists. Use a dry wall knife/saw to cut out the opening. WARNING! Absolutely no part of the template should overlap a joist. 2 Insert a push pin in the template center. 3 Mark cutout through slots in template. Remove Template.
Figure 12. Connecting the Helos 20 for stereo use. Figure 13. Connecting the Helos 20 bridged for mono use. Figure 14. Installation step 6–7. 5 6 Place speaker in hole. 7 Use a 2-inch long #2 Phillips driver and an electric drill to lock all 3 mounting locks in place. Use a low clutch setting on the drill. Take care to assign the same color to the (+) terminal on the speaker and the amplifier. Stereo: Connect two sets of speaker cables from the left and right channels of your amplifier (figure 12).
Figure 15. Installation step 8. Figure 16. Installation step 9. 8 9 Gently pivot the tweeter stem to point towards the primary listening position. To rotate the speaker, rotate the entire speaker assembly. DO NOT rotate the tweeter stem. Gently press the grill cover into place.
Customizing and Painting Painting the Speaker Frame Painting the Speaker Grill Figure 17. Painting the speaker frame. Figure 18. Painting the speaker grill. NOTE: The Helos 20 can be either painted in place or removed from the ceiling for painting. IMPORTANT! The grill must be removed from the speaker before painting. IMPORTANT! Do not paint the rear of the speaker or the surface behind the grill. IMPORTANT! The scrim must be removed before painting the grill.
Frequently Asked Questions and Troubleshooting Frequently Asked Questions Troubleshooting How do I clean my speakers? Just use a dust free cloth or a soft brush to remove the dust from your speakers. We recommend a specialty cloth (available at the Xtatic shop at www.martinlogan. com) that cleans your speakers better than anything else we have tried. Do not spray any kind of cleaning agent on or in close proximity to the drivers. Output • Check that all your system components are turned on.
General Information Specifications Warranty and Registration System Frequency Response 47–20,000 Hz ± 3 dB Your Helos 20 speaker is provided with an automatic Limited 90 Day Warranty coverage. Sensitivity 89 dB/2.83 volts/meter (mounted in ceiling) Impedance Mono: 4 ohms Stereo: 8 ohms x 8 ohms You have the option, at no additional charge, to receive a Limited 5 Year Warranty coverage.
Glossary AC. Abbreviation for alternating current. Active crossover. Uses active devices (transistors, ICs, tubes) and some form of power supply to operate. Amplitude. The extreme range of a signal. Usually measured from the average to the extreme. of Audio Terms Diffraction. The breaking up of a sound wave caused by some type of mechanical interference such as a cabinet edge, grill frame or other similar object. Diaphragm.
Inductor. A device designed primarily to introduce inductance into an electrical circuit. Sometimes called a choke or coil. Linearity. The extent to which any signal handling process is accomplished without amplitude distortion. Midrange. The middle frequencies where the ear is the most sensitive. NAC. The abbreviation for natural ambience compensation. Passive crossover. Uses no active components (transistors, ICs, tubes) and needs no power supply (AC, DC, battery) to operate.
