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The SP21E is a compact self-powered high SPL sublow system.

The cabinet is constructed of rigid, multilayer-birch ply reinforced with

multiple bracing and finished with a sturdy coating.

Cabinet dimensions are optimised for international trucksize.

Ergonomical grippoint layout, nano Armor polyurethane coating and

additional corner protection with multiple slide bars facilitate easy transport. Protective slidebars facilitate locked stacking of more  cabinets.

Polemounting can be done standing or flat. The SP21E will endow any F.O.H

system with a rock solid foundation in the lowest audioable octaves.

The S.A.L.C(Single Audio-Logic level control) speaker management is proprietray RMS based gain riding circuit which maintains the tonal balance of the sound as preceived bt the human ear and protects the drivers from over excursion or overheating. A recessed switch facilitates Sound Projects standard* or free external lowpass selection.

To match the desired cabinet and to obtaion maximum effciency, state-of-the-art computer aided modeling techniques and acoustic calculation programs are used to precisely indicate the mainfold reinforcing ribs and port tuning.

*60Hz @24dB Butterworth


Technical spec data





Acoustical specifications:

- Drivers: 1 x 21" high power, low weight, neodymium design

- Freq. response: 25-60Hz/FR (switch)

- Max. peak SPL @1m: 134dB c.f. 2 (6 dB)

- Coverage angle: omni-directional

Electrical specifications:

- Amplifier(s): CCD™ technology

- Output: 2400W sine (DALC limited)

- Low pass 4th order: 60 Hz

- Filter subsonic: 25Hz, 2nd order

- Input impedance: 20 kOhms balanced, 10 kOhms unbalanced

- Output impedance: hard-wired to input

- Power consumption.

- Mains voltage: 230V (other on request)

- Mains frequency: 50/60 Hz

- Idle: < 50VA

- Full load: < 3000 VA. DALC limited Ref. to continuous pink noise   signal (6 dB c.f. within --the specified range)

- Protection

- D.A.L.C. (Dual AudioLogic Control)

- Protection threshold: +4dBU

- Transient (soft power-up)

- DC-voltage short-circuit

- LED indication: power-on/signal/protect/switch (60Hz/Fr)





Additional descriptive data:

- Cabinet construction: cross grain laminated Multiplex with   multiple bracings

- Finish: Nano-armor™ coating

- Weight: 62 kg

- Size WxHxD (mm): 600x750x620 (748)

- Rigging points: optional flying side frames

- Audio connectors: IEC XLR-3 in/out

- Main connectors: powercon in, powercon out

- Max. operating temp.: -10 to 40 C ambient