MartinLogan Grotto I User Manual
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MartinLogan Grotto I User Manual

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Summary of Contents for MartinLogan Grotto I

  • Page 1 r o t t o ’...
  • Page 2 WARNING! Do not use your Grotto i loudspeakers outside of the country of original sale—voltage requirements vary by country. Improper voltage can cause damage that will be potentially expensive to repair. The Grotto i is shipped to authorized MartinLogan distributors with the correct power supply for use in the country of intended...
  • Page 3 Thank you—to you the MartinLogan owner, for loving what we do, for making it possible for us to do what we love.

  • Page 4: Table Of Contents

    MartinLogan Exclusives . . . . . . . . . . . . . . . . . . .

  • Page 5: Installation In Brief

    In rIef We know you are eager to hear your new MartinLogan Step 1: Unpacking subwoofer, so this section is provided to allow fast and Remove your new subwoofer from its packing. Note: easy set up. Once you have your subwoofer operation- Retain original packing materials for future use.

  • Page 6: Controls And Connections

    The 25Hz Level knob signifi- 70% of 43Hz equals 30.1, so you cantly adjusts frequencies where should set the Grotto i’s low pass peaks and dips of different ampli- filter to 30Hz. Remember, this is a tudes often manifest in real world general rule.

  • Page 7: Connections

    Connections Right Out / Left Out Status Light Should only be used if con- The Grotto i is equipped with a necting this sub between multi-color LED to indicate the a pre-amp and amplifier. current status of the woofers. Connect to the Left In/Right The following list explains the In on the amplifier.

  • Page 8: 2-Channel Mode

    3 Try the phase control in different settings until the best blending is obtained. If you are using the subwoofer to augment other MartinLogan products, we suggest start- ing with the phase set at 90°. 4 If you have completed steps 1–3 and still have weak or boomy bass, adjust the 25Hz Level knobs to compen- sate for these anomalies.

  • Page 9: Multi-Channel Mode

    2 Try the phase control in different settings until the best blending is obtained. If you are using the subwoofer to augment other MartinLogan products, we suggest start- ing with the phase set at 90°. 3 If you have completed steps 1–2 and still have weak or boomy bass, adjust the 25Hz Level knob to com- pensate for these anomalies.

  • Page 10: 2-Channel/Multi-Channel Mode

    4 Try the phase control in different settings until the best blending is obtained. If you are augmenting MartinLogan loudspeakers, we suggest you start with Phase set at 90°. 5 Use the bass management section of your processor’s speaker setup to set the subwoofer level at an appro- priate level.

  • Page 11: 2-Channel Mode Using Speaker Level Inputs

    2-Channel Mode Using Speaker Level Inputs This setup is recommended if your subwoofer will be used in a 2-channel only system with full-range front loudspeakers. When a signal is connected to the subwoofer’s Left In/Right In subwoofer’s Low Pass Filter control is active. Signal Connection (see figure 7): 1 Connect the left and right outputs of your amplifier to the subwoofer’s high-level Speaker Level In (Left In/Right...

  • Page 12: 2-Channel Mode With 2-Channel Output

    2-Channel Mode With 2-Channel Output This setup is recommended if your subwoofer will be used in a 2-channel only system. Signal Connection (see figure 8): 1 Connect the left out/right out from your preamplifier to the Left In/Right In of the subwoofer. Use quality RCA interconnects.

  • Page 13: Sub Out-Using Multiple Subwoofers

    Connecting to the Right (or Left) In allows addition- al subwoofers to perform as dedicated 2-channel subwoofers (see figure 11). Figure 10 . Using multiple Grotto i. LFE option. Primary sub on right. Additional sub on left. 3 Repeat step 2 for each additional subwoofer in the chain using the same input for every additional connection.

  • Page 14: Ac Power Connection

    AC main and turns on/off all power optimal performance occurs. This will factor in on any going to the subwoofer. The Grotto i also integrates a sig- critical listening and judgment. nal sensing power supply that will go to Standby mode after a few minutes of no music signal if the front-panel power switch is set to 'Auto'.

  • Page 15: Placement

    (see figure 14). Figure 13 . Grotto i Subwoofers as the LFE (effects) channels, MartinLogan Vista speakers as front channels, and MartinLogan Motif as the center and surround (effects) channels.

  • Page 16: Room Acoustics

    The feet that attach to an ideal room would be to neither delete nor contribute the bottom of the Grotto i use a common - 16 thread. to that information. However, nearly every room does to some degree.

  • Page 17: Home Theater

    It is important that the center speaker Figure 16 . Vista speakers as front channels, the Motif as the center and surround channels, and the Grotto i subwoofers as 0.1 (effects) channel. be extremely accurate and mate well with the front...

  • Page 18: Martinlogan Exclusives

    25Hz Level Control This occurs significantly in almost all non-servo-controlled subwoofers. The Grotto i 25Hz Level controls allows custom sound MartinLogan’s advanced servo system uses a sophisticated tailoring capabilities found in few subwoofers. A room, monitoring and control circuit to detect and instantaneous-...

  • Page 19: Frequently Asked Questions & Troubleshooting

    • Make sure the level control is not turned down. subwoofer—especially containers holding liquids. • Turn off and unplug the Grotto i and check the fuse near the AC power cord receptacle on the back. If the Is there likely to be any interaction between my...

  • Page 20: Dimensioned Drawings

    ImensIonal rawIngs Plan View (Top) Front Elevation Back Elevation Side Elevation Dimensional Drawings...

  • Page 21: General Information

    25Hz Level ±10dB Serial Number Power On, Auto, Standby Grotto i’s serial number is located near the bottom of the backplate. Each individual unit has a unique serial number. Components Service ” (25.4cm) high-excursion, aluminum cone with extended throw driver assembly, sealed non-resonant...

  • Page 22: Glossary Of Audio Terms

    lossary of udIo erms AC . Abbreviation for alternating current. DC . Abbreviation for direct current. Active crossover . Uses active devices (transistors, IC’s, Diffraction . The breaking up of a sound wave caused by tubes) and some form of power supply to operate. some type of mechanical interference such as a cabinet edge, grill frame or other similar object.
  • Page 23 Inductance . The property of an electrical circuit by which Resistor . A device used in a circuit to provide resistance. a varying current in it produces a varying magnetic field that introduces voltages in the same circuit or in a nearby Resonance .
  • Page 24 WARNING! Do not use your Grotto i loudspeakers outside of the country of original sale—voltage requirements vary by country. Improper voltage can cause damage that will be potentially expensive to repair. The Grotto i is shipped to authorized MartinLogan distributors with the correct power supply for use in the country of intended sale.

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