But to achieve this optimum performance, every driver needed be powered by its own dedicated amplifier module to take advantage of shortest cable runs, perfect matching power supplies and impedance data. As a long-term partner of Lambda Labs, Nell chose Powersoft to provide amping for the “Wall of Bass,” while Lambda Labs supported the installation with items like amplifier mounting frames.
“As we have been using Powersoft amplifiers in our regular self-powered loudspeakers for four years, it was obvious to choose the company again for this project as we have a lot of experience with their modules, such as the Digimod 1500, which we use successfully in our subwoofer product MF-15A and our full range enclosure TX-3A,” Kroschel notes.
“Their amplifiers deliver stable power also in the low frequency range, are small and lightweight, and fulfill most of our demands regarding sound quality,” he continues. “For the project, we used the D-Cell, because it is very compact and still delivers plenty of power.”
The 32 Lambda Labs OEM CX 15-inch ultra-long excursion drivers, with ± 25mm linear excursion capability set in housings made from special concrete. Each is driven by 800-watt amplifying modules, with the maximum desired SPL reached at an excursion of only ±3mm. Therefore, the “Wall of Bass” manages with only 500-watt peak music power during operation, providing great energy efficiency.
Via the 2-channel 32 D-Cell504 IS amp modules, Powersoft was able to deliver 25,600 watts of amplifier power. In addition, special mid-high loudspeakers generate a cylinder wave for longer throw and less room reflections while the DJ reference sound is provided by CX-1A and CX-3A self-powered monitors with Powersoft D-Cell modules.
Available in both 2-channel and an incredibly compact 4-channel model with two amp units, D-Cell504 IS will power 2-way loudspeakers with up to 2 x 350 watts into 4 ohms or 1 x 700 watts in bridge mode at 8 ohms – or even 3-way systems with up to 700 watts on the low end.
Performance is enhanced via PFC power supply, allowing error proof operation, and Class D output stage, also available with DSP on board.
Integrated within an elegant aluminum heatsink panel, the D-Cell504 IS provides an interface panel with input volume potentiometer, double XLR for mono input and link out or stereo input operation, four LED for Limit, Clip, Signal and Ready signalling, with a 4-LED preset selection button to show the preset in use.
Easy access to the DSP mounted on board, is further facilitated via remote control capabilities provided by Powersoft’s proprietary Armonía Pro Audio Suite.
“The data we measured melts in one’s mouth,” says Nell. “The sound pressure level is beyond 140 dB and absolutely equal at any point in the room (not that anyone would need such sound pressure levels). And you don’t have the possibility to feel 7 Hz throughout your whole body.”
Summing up, Kroschel says that everyone who has played through the system has been impressed.
“For some it has changed their awareness of music,” he concludes. “Although we have not been able to find movie soundtracks with lower frequency response than 20 Hz, during our live presentations of the ‘Wall of Bass’, we play an original recording of a Challenger rocket launch, to give a natural idea of the breathtaking force. Another show element was to generate some sine waves down to 7 Hz, demonstrating this outstanding response by also making the acoustic waves visible with smoke.”