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ROCK-tech, your partners in sound...

ROCK-tech makes exclusive use of Hill Power-Cube speaker systems, a modular, self-powered design based around the PD-12 coaxial full range driver.

Our in house design team develops, manufactures and services the speaker system, allowing bespoke solutions and a flexible and creative edge over the competition.

Please select model:   M5 | M5S | M7 | M7S | M8 | M9 (new)

  M8 Power-Line, Line array
by Malcolm Hill

  >  Hits every seat in the House, with consistent, crystal clear sound.
  >  Single point rigging : set in seconds, flown in minutes.
  >  Self-powered : zero-loss cabling.

What is 'Line Array'?
Technically, Line Array is any sound system where the coverage is controlled by the relative positioning of the speakers along a fixed line.

Recently, Line Array has become the generic name for large format sound systems where the speaker elements are arranged in one, tall, vertical column (as opposed to the conventional rectangular block)

What are the advantages?
The first, and major, advantage is that Line Array systems occupy a very small footprint in the concert production, freeing much space for video screens and maximising audience sight-lines.
The second advantage is extremely simple rigging, where the system is flown.
A third benefit is provision of cleaner sound to the audience in high-tiered seating, if the line array column is tall enough to reach them.
The fourth benefit is tighter audio-imaging, as the wavefront(s) do not suffer the usual 'big rig' interference, as the rig comprises just two columns.

At this point it must be pointed out that some systems currently in use fail to deliver on several of the above potential benefits.

What are the disadvantages?
The first, and massive, problem area for current line array systems is horizontal coverage.
Any audience outside a narrow 80deg arc suffers dramatic loss of clarity, unless the system is augmented by a conventional system to take over where the Line Array leaves off. This attempted remedy at best removes the physical advantages of Line Array, and at worst causes dramatic loss of sound quality where the two technologies are not compatible.
The other disadvantage is the difficulty to deliver bass frequency performance over the height of the column. Some systems resort to adding bass boxes alongside the mid/high Line Array, once again compromising the potential physical advantages.

What is the M8?
M8 is the model name given to the Line Array box from Malcolm Hill, based on the proven Powercube full range powered speaker.
M8 fully delivers on all the potential benfits of Line Array.
Moreover, M8 delivers a full, effective 120deg horizontal coverage to bring those benefits to virtually all the audience. And even if some audience are outside the 120deg arc, Powercube 'fills' can be intoduced with no loss of quality, as the technologies are identical.
M8 arrays are genuinely full-range, in 6 box format response is down to 55Hz, and in 12 box format, down to 45Hz.
In addition, M8 boxes are self-powered with studio quality, multichannel amplifiers allowing mix-position processing to fine tune dispersion, wavefront edge equalisation etc. etc.



M8 - Line Array that works



M8 Specification:

Acoustic
Bandwidth ±4 dB from 60 Hz to 18 kHz, -6 dB at 50 Hz and 19 kHz (40Hz 6 box)
Maximum SPL 140 dB peak @1m, (155dB 6 box)
Coverage Angle 80° - 120° hor. (line-driver controlled) x 60° vert.
Driver
Full Range (4) 12 inch PD-12 coaxial cone radial cooling (3 inch voice coil)
High Frequency (4) 2 inch titanium diaphragm coaxial compression driver maintaining SPL above 5k
Amplifier
Input 20k ohm impedance, electronically balanced
Connector 2ch 5 pin XLR (Male and Female)
Nominal Input Level +4 dBu
Design Fully linear. Convection cooled.
Output power 2 x 1250W rms.total 2500W, (burst 3500W rms)
THD, IMD < .01 %
AC Power
Connector Neutrik 'Powercon'
Voltage 100-110-115-120 / 220-230-240 +10%/-6%
Operational Voltage Turn on -30% Drop out -40%
Max AC Continuous 115V:25A 230V:12.5A
AC Burst 115V:50A 230V:25A
Soft-start Inrush current <20A
Physical Specification
Dimensions 48"W x 14.75"H x 24"D (48 x 54 x 24 on 3 box dolly)
Weight 85kg (190lbs), MkII
Enclosure Finest grade Finnish Birch Marine Ply
Finish Black textured
Protective Grille Acoustic foam-backed, perforated steel grill
Flying Proprietary 2-point flybar and speed-link system. Box to Box splay adjustable 0° - 4° Working load rated to 30 boxes
Set Up Boxes can travel as individual units, the array being assembled by each box linking to the box above. Alternatively, boxes travel flat on dolly pre-rigged in blocks of 6, prewired to 1 signal multipin and 1 AC connector. At site, block is rolled/forked/craned into position. Motors are attached and block lifted. Any desired splay would normally be preset. However, splay can be adjusted at this point. As block is lifted, boxes automatically open out to any preset splay. 2nd block is positioned, 1st block is lowered, pinned, and lifted. System (especially wavefront edges) fine-tuned to suit venue using multi-out Line driver (e.g. BSS Soundweb) with capacity to adjust level, EQ, delay etc. independently for inner and outer drivers in each M8.

Due to constant research, development and improvements, all specifications are subject to change without notice.
M8 Power-Line
M8 Front Technical Drawing
M8 Side Technical Drawing
M8 Base Technical Drawing
Malcolm Hill Logo Malcolm Hill Associates




t: 01904 481700 m: 07944 900101 e: info@rock-tech.co.uk
the warehouse   murton lane   york   YO19 5UF