The PAX ProAV Group
  • InfoComm 2023
  • June 14th - 16th
  • Orlando, Florida
  • Visit Penton - Booth 2542
Phone: 1-888-883-8383 | Remote Support

Low Ceiling Horn

Industrial Low Ceiling "Long Throw" Horn

The LCH70T is one of the latest products from ATEIS INTERNATIONAL and especially designed for the voice-evacuation market. The LCH70T is a typical exponential horn that is designed to be used in placed with restricted ceiling heights and where far throws are requested.

The LCH70T is made of reinforced fiber/epoxy and equipped with a strong and powerful 2" compression driver, capable of producing a fabulous 117 dB. The shape and structure allow for use in highly demanding environments like traffic tunnels and car parks. Also train tubes that need to be addressed during voice-evacuations are typical examples where the LCH70T would fit perfectly.

Due to its dimensions, its throw can reach from 40 up to 70 m, reducing amplifiers and delay lines when compared to conventional distributed sound systems for tunnels. This will bring the total costs down and due to a lower number of horns, it will bring the Q-factor up and so the intelligibility of the overall evacuation system.

The LCH70T has an extended frequency range that runs up to 8 kHz allowing for high-fidelity speech messages in situation where the acoustics are limited and therefore the demands on the sound system high. Highly directional horns will result in a bigger in between, repeating distance, reduced sound points and so reduced number of amplifiers and delay-lines and so, resulting in a better overall price performance.

The LCH70T is a typical symmetrical exponential horn (= where the horn length is exponentially related to the horn area) that uses the mounting surface as wave guide. This way a "half cell" construction can be used, reducing its mouth height that is important when used in environment with height restrictions. Once in the proper band pass region for a given size, an exponential horn presents a fairly consistent acoustical load to its driver. This helps both output level and evenness of frequency response, and is what makes this horn design simple and effective.

The LCH70T should be fixed against a large and flat surface that acts as a waveguide and mirror.. The small horizontal opening angle of only 30 degrees guarantees that the sound will stay unaffected by lateral distortion and so will increases the in-between distance of the horns.
  • Boundary effect, low-spill
  • Increased repeating distance
  • Long-horn, straight patterns
  • 2-inch compression driver
  • High-SPL
  • High-directivity
  • Traffic tunnels.
  • Industrial purpose.
  • Long throw.
  • High SPL.
  • High intelligibility.
  • Special purpose design.
  • Durable.
LCH70T - Electrical Specifications
100/70/50 Volt Line Transformer
Maximum Power
70 Watt RMS
Dual ceramic connector blocks with M20 PG12 glands
Electrical Performance SPL_MAX 132 dBA @ 70 Watt
Frequency Range 300 Hz - 8 kHz
Horizontal Opening Angle @ 1 kHz 30 degrees
Vertical Opening Angle @ 1 kHz 15 degrees
Sensitivity 1 W / 1 M 112 dB @ 500 Hz
120 dB @ 1 kHz
116 dB @ 2 kHz
108 dB @ 8 kHz
Q-factor @ 1 kHz 250 Hz = 7.3
500 Hz = 14
1 kHz = 30.5
2 kHz = 38
4 kHz = 38
8 kHz = 38
External High-Pass Filter Requirements 250 Hz, 2nd order (filter not included)

LCH70T - Mechanical Specifications
Material Glass fibre reinforced epoxy flame-retardant polyester
IP rating IP56
Color RAL7004 (dark-grey)
Dimensions Length: 1340 mm - Width: 840 mm (flare side) - Height: 300 mm
Weight 35 kg approximately
Mounting type 8 x M12 spacings
Spay water protection on mouth Stainless steel mesh grill

LCH70T Spec Sheet