The ALTO ELVIS 12/12M MKII is a series of passive speaker enclosures designed for professional audio applications. Developed by a multinational team of audio engineers and musicians in Emilia-Romagna, Italy, these speakers are engineered to deliver high sound pressure levels and superior performance within their range. The design emphasizes flexibility in passive configurations, allowing them to be used with single or multiple subwoofers.
Function Description:
The ELVIS 12/12M MKII speakers are 2-way passive speaker cabinets designed to reproduce audio signals with high fidelity and power. They feature a crossover circuit that separates the audio signal into low and high frequencies, directing them to dedicated woofer and driver speakers, respectively. The ELVIS 12 is a full-range passive speaker, while the ELVIS 12M is a passive monitor speaker, both sharing similar core specifications but with slight differences in dimensions and frequency response tailored to their intended use.
Important Technical Specifications:
ELVIS 12 MKII 2-way Passive Speaker Cabinet:
- Power System: 250W continuous / 500W peak (AES Standard)
- Frequency Response (-10dB): 57Hz-18KHz
- Sensitivity (1w @ 1mt): 96.5dB SPL
- Impedance: 8 Ω (nominal)
- Maximum SPL @ 1m: 120dB continuous / 123dB peak
- Coverage (HxV): 70°x 70° nominal
- Transducer Low: 12" Woofer, 2" voice coil, with double ventilation
- Transducer High: 1" Neodymium on Spherical Horn (Tractrix contour)
- Passive Crossover: 2.25KHz at 12dB/oct, with HF protection
- Enclosure Construction: Chipboard cabinet, glued and reinforced, covered in black carpet; black metal corner and rubber foot.
- Input Connectors: Two Parallel SPK NL-4 for INPUT/THRU
- Mounting: One standard pole-mount plus one plastic handle
- Dimensions (HxWxD): 603 x 394 x 355 mm (23.7" x 15.5" x 14")
- Net Weight: 16.9kg (37.3 lb)
ELVIS 12M MKII 2-way Passive Monitor Speaker Cabinet:
- Power System: 250W continuous / 500W peak (AES Standard)
- Frequency Response (-10dB): 64Hz-18KHz
- Sensitivity (1w @ 1mt): 96.5dB SPL
- Impedance: 8 Ω (nominal)
- Maximum SPL @ 1m: 120dB continuous / 123dB peak
- Coverage (HxV): 70°x 70° nominal
- Transducer Low: 12" Woofer, 2" voice coil, with double ventilation
- Transducer High: 1" Neodymium on Spherical Horn (Tractrix contour)
- Passive Crossover: 2.25KHz at 12dB/oct, with HF protection
- Enclosure Construction: Chipboard cabinet, glued and reinforced, covered in black carpet; black metal corner and rubber foot.
- Input Connectors: Two Parallel SPK NL-4 for INPUT/THRU
- Mounting: One standard pole-mount plus one plastic handle
- Dimensions (HxWxD): 603 x 390 x 380 mm (23.7" x 15.4" x 15")
- Net Weight: 15.5kg (34.2 lbs)
Usage Features:
The ELVIS 12/12M MKII speakers are designed for ease of integration into various sound systems. The inclusion of two parallel SPK NL-4 connectors allows for daisy-chaining multiple speakers, simplifying wiring in larger setups. The standard pole-mount and plastic handle facilitate flexible placement and transport, making them suitable for both fixed installations and portable applications. The robust chipboard cabinet construction, reinforced with black metal corners and rubber feet, ensures durability and stability during use. The passive crossover with HF protection safeguards the high-frequency driver from potential damage due to excessive power, enhancing the longevity and reliability of the speaker. The Tractrix contour of the spherical horn for the high-frequency transducer ensures consistent and wide sound dispersion.
Maintenance Features:
The service manual provides a comprehensive troubleshooting guide to address common issues that may arise during operation. This includes:
- No Sound: Solutions range from verifying power connections and switches, checking for faulty power cables or blown fuses, to ensuring the signal source is active and signal cables are properly connected.
- Distorted/Very Loud Signal (LIMIT light lit): Recommendations include reducing the output level of the source, turning down speaker level controls, or using additional EON speakers if available.
- Distorted Signal (LIMIT light not lit): Advises reviewing the mixer's owner's manual to adjust input sensitivity, channel faders, and master faders.
- Noise or Hiss: Suggests disconnecting devices one at a time to isolate the noisy source or connecting cable.
- Hum or Buzz: Solutions involve checking for improper A/C ground, faulty equipment connections, or ground loops. This may require "lifting" the audio ground using an XLR/F to XLR/M adapter, re-routing audio cables away from AC power, or using a DI box for unbalanced equipment.
- Improper System Gain Structure: Recommends reducing INPUT level controls and increasing the output level of source devices.
- Issues with MIX/LOOP SWITCH: Provides instructions to set the switch to the MIX position (depressed) or disengage the MIX/LOOP OUT switch and set to LOOP, depending on the desired configuration.
- Feedback/Howl: Advises repositioning speakers to avoid pointing at microphones' pickup patterns, using mixer EQ or an external equalizer to reduce feedback frequencies, or reducing gain at the mixer and moving the microphone closer to the sound source.
The manual also includes detailed schematic diagrams, PCB layouts, wiring diagrams, and an exploded view with a mechanical parts list and Bill of Materials (BOM). These resources are invaluable for technicians performing repairs or component replacements, ensuring accurate identification and sourcing of parts such as woofers, tweeters, crossover components (inductors, capacitors, resistors), and cabinet hardware. The BOM lists specific part numbers and descriptions, including details like speaker types (e.g., HK10296 K-speaker_woofer, HG00214 tweeter-RS), PCB specifications (e.g., HB02396 PCB-RS-FR-1 71.331.31.6), and various screws and labels, facilitating precise maintenance and repair procedures.
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