This Atlas Classroom Sound System is the perfect solution for K-12 and higher education facilities. This complete audio package consists of one Pure Resonance SD4 Ceiling Speaker Array and one Atlas Sound AA30PHD 30 Watt Mixer Amplifier.

The SD Speaker employs (4 smaller 6.5”) very fast transient response aluminum-woofer drivers that are very powerful and stable. Working in unison these drivers produce clean powerful dynamic sound. When designing the SD the goal was to have the single most import feature at the forefront, good transient response ("dynamic contrast"). A transient is a sound of short duration, and good transient response can only be achieved if the speaker can deliver its output quickly and cleanly without smearing the original sound, and be completely soundless immediately after. Transients contain the essentials of sound reproduction they provide the sharp pop from a snare drum, the cutting edge of digital sound, the dynamics of the human voice. Larger 2-way cabinet loudspeaker systems offer relatively slow transient response, and the small high-frequency horn tends to beam a narrow, blaring sound at the listener—end result, muddy sound. By replacing larger speakers with four 6 or 8" drivers we increased the driver surface area while creating more punch and a tight, more focused low-end.

The Atlas Sound AA30PHD is a 30 Watt, 3-Input Mixer Amplifier that is specifically designed for use in 70.7V speaker systems. The AA30PHD features a unique automatic system test using the front panel "Push Here Diagnostic" button. This internal circuitry is designed to check the connected speaker lines for wiring and impedance errors. This test can be activated once all speakers are connected and the circuit automatically verifies that the attached speakers' tap settings do not exceed the amplifier's rated power, no speakers are mistakenly tapped at 8Ω, and the speaker wire is free from shorts. This allows for quick troubleshooting on site and after the sale.

Pure Resonance® Audio SD4 SuperDispersion® Ceiling Speaker Array:

• SuperDispersion® 360 x 180 Omni Directional Coverage
• Engineered for voice, paging and music applications
• Infinite-baffle in-ceiling speaker drops into standard ceiling tile openings
• Powerful – 160 Watts at 8 Ohms, 64 Watts at 70 Volts
• 4 - 6.5" High compliance aluminum woofers with ported bass response and high frequency dome tweeters
• Uniquely designed fire retardant ABS housing may be painted to match any décor
• Impedance: 8 ohms nominal with built-in 70 Volts (4, 8, 16, 32, 64 watt taps), easily adjustable by rotating switch
• Metal Backbox that is acoustically engineered and sealed for maximum sonic performance
• Safety cable kit included

 
Atlas Sound AA30PHD 30W Mixer Amplifier:

• 30W into 25V/70.7V and 4Ω Loads
• Rear Mounted DIP switch Allows Mute Receive for Inputs 2 and 3
• Contact Closure Mute Terminals
• Variable Mute Sensitivity Control for Input 1
• Two Unbalanced, Summing Line Level Inputs
• Balanced Mic/Line/Tel Input w/ Phantom Power
• Automated Diagnostic System Test (Push Here Diagnostic)

• (1) Pure Resonance Audio SD4 Ceiling Speaker Array
• (1) Atlas Sound AA30PHD 30W Mixer Amplifier
• (50') West Penn Wire 224 18 Gauge Speaker Wire