"The classic Tannoy two-way dual concentric driver technology offers single point source, full bandwidth, phase coherent wavefront reproduction. The integrated 2 x 75 watt power amplifiers in each speaker, enable the System 600As to deliver a typical maximum SPL of 117 dB at the mix position. The 6.5 inch dual concentric driver is loaded within a bass reflex cabinet with two flared port tubes, providing a 44 Hz - 20 kHz frequency response, at +3 dB."
That's the press stuff........ Tannoy speakers use a single speaker chassis with a bass driver and mounted inside that is a centrally positioned tweeter unit.. This is called a 'dual-concentric' speaker, and Tannoy are famous for them... Advantages of Dual-concentric speakers is a single sound point source... bass AND trebble audio waves all eminate from the same central point so stereo imaging is excellent, and you get a good image without having to stand exactly in the 'sweet spot' right slap-bang in the center of the speaker feild.
There are two units in the 600 Series - Active and passive... The System 600A self powered nearfield monitor is based upon the System 600 dual concentric passive design.
For the ACTIVE speakers, inputs are balanced, combined XLR / 1/4 inch jack connectors and sensitivity is switchable between -4 dBU and -10 dBU. Additionally LF and HF contour switches allow for close to wall mounting and provide a +2 dB HF boost respectively.
The System 600A (active) is also among the most competitively priced, mid/ close field, self powered monitor systems available; guaranteeing a professional standard, fully matched, high performance amp and speaker system.
Technical specification (series 600A - active):
Frequency response: Free space setting - 44 Hz - 20 kHz. Half space setting - 52 Hz - 20 kHz.
Maximum SPL (peak @ 1 m): 107 dB SPL. Maximum SPL at mix position (1 pair driven): 117 dB SPL. Distortion: < 0.5%. Dispersion: (@ -6dB) - 90 degrees (conical).
Input: 10 kohm balanced on combined XLR/jack connector. Sensitivity: Adjustable, +4 dBu or -10 dBu. Crossover frequency: 1600 Hz. Amplifier output power: LF channel (6 ohms load) - 70 w rms. HF channel (6 ohms load) - 70 w rms. Output noise (HF channel, 20Hz - 20 kHz unweighted): -80 dBV. Supply: Self-contained PSU with detachable mains power cord. Mains voltage adjustable to 220-240V or 110-120V.
Drive units: 6.5" Tannoy Dual Concentric type 1678. Low frequency design: Bass-reflex load using flared port tubes, in 13 litres. Cabinet construction: MDF (36 mm) front and back panels, 19 mm high density particle board. Two panels fitted with magnetic shielding plates. Cabinet finish: Spray "F" Vinyl. Cabinet dimensions (HxWxD): 220 mm x 360 mm x 290 mm. Cabinet weight: 9.5kg. 
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