High performance.

The TrueLine TL218SS is designed to satisfy the need for an extreme high-SPL sub bass loudspeaker system. Components have been selected solely for their performance.

The TrueLine TL218SS utilizes a direct radiating 18-inch, 4,000W cone driver in a tuned enclosure, which provides maximum output with minimal distortion and smooth extended low frequency response. The tour tested 21 ply Baltic Birch highly braced enclosure and 24 mm thick baffle board construction provide unsurpassed rigidity and strength.

Built to last.

The enclosure is built to truck pack dimensions for efficient transportation of multiple units, and should be arrayed to increase performance in large or outdoor venues. The TrueLine TL218SS is designed to be used for low frequency sections in multi-way speaker systems, or as a sub bass section in any sound system requiring extended low frequency response and the highest quality audio reproduction.

The TrueLine TL218SS comes with a multi-layered catalyzed Polyurea finish and is offered with a variety of color options. The TrueLine TL218SS delivers the transparent sonic quality and easy portability necessary for the demands of professional audio today.

Key features:

  • Extended Low Frequency
  • High Level Output
  • High Power Handling
  • Low Power Compression
  • Removable Caster Board
  • Tour grade enclosure and mechanics
  • Powder coated steel grille with a high transmission ratio


Technical Specifications

System Performance

Frequency Response (-3 dB) * 25 Hz – 150 Hz
Frequency Range (-10 dB) 18 Hz – 150 Hz
Recommended High-Pass 20 Hz – with minimum 24 dB / octave (4th order) Butterworth slope
Nominal directivity (-6 dB) Omni or cardioid
Recommended Crossover Frequency 90 Hz (acoustic, active, external DSP)
RMS handling capacity ** LF: 4000 W
Maximum SPL @ 1 Meter *** 143 dB ([WorxAudio] preset)


Components LF: 18” (457.2 mm) x 2
Nominal Impedance LF = 4 ohms, Self Powered


Enclosure Baltic birch plywood, engineered plastics, and aluminum frame
Finish Two-part spray catalyzed Polyurea coating on plywood
Grille 14-gauge (1.0 mm) perforated stainless steel, powder-coated finish, black
Environmental Indoor use only
Connectors Two (2) parallel-wired NL4 Neutrik® Speakon® connectors
Power Amp Connectors Neutrik® powerCON (AC) XLR M/F (In/Out)
Suspension/Mounting Internal bracket w/ threaded 0.375” Flying points (x17)
Dimensions 22.5” H x 48” W x 30” D (571.5 mm x 1,219.2 mm x 762 mm)
Net Weight 285 lb. (129.27 kg)
Shipping Weight 295 lb. (133.80 kg) - approximate with carton
Product Versions TL218i, TL218i-P, TL218T, TL218T-P
Digital Power Amp PXD-2500
2500W (x1) LF
Digital (100) program processing, LCD readout
XLR M/F Isolated I/O
AC powerCON I/O


* Frequency response and range measured on-axis with anechoic environment.
** Power handling tested using pink noise filtered to meet IEC 268-5, 6 dB crest factor, 100 hours, with recommended EQ.
*** Peak level measured at 1m under free field conditions using 10 dB crest factor pink noise with specified ([WorxAudio] preset) and corresponding EQ settings.