Toa HLS38UL-8/16, HLS38UL-8, HLS38UL-16 Specification Sheet

TOA SPEAKER COMPONENT

LOW-FREQUENCY LOUDSPEAKER

HLS38UL-8/16

DESCRIPTION

The HLS38UL is a 380mm (15 in.) low-frequency

loudspeaker designed for professional applications in
high level sound reinforcement environments such as
studios, theaters, concert halls, auditoriums, discos and

live sound reinforcement applications, where high
efficiency, ultra-low-frequency response, and faithful
reproduction are required. The HLS38UL offers high

power handling capacity and a uniform frequency
response from 30Hz to 3,000Hz. A crossover frequency
of 1,000Hz or lower is recommended to obtain smoothest
overall system response. Nominal impedance is 8 ohms
for the HLS38UL-8, and 16 ohms for the HLS38UL-16.
The loudspeaker employs a low-mass 72mm (2.8 in.)
diameter voice coil of edgewound copper ribbon on an
aluminum coil form, which operates in a flux density of

14,200 gauss. The voice coil is driven by double ferrite
magnets, which are supported by a rugged diecast
aluminum frame. The cone suspension is made of
exceptionally high- compliance, damped-cloth surround.

FEATURES

1. Smooth, extended ultra-low-frequency response.

2. High power handling capacity: 500 watts continuous pink
noise (AES Standard).

3. High efficiency and linearity in ultra-low response.

4. Low distortion.

5. Voice coil of edgewound copper ribbon, with an aluminum
coil form.

6. Powerful double ferrite magnet structure.

7. Rigid diecast aluminum construction.

SPECIFICATIONS

Nominal Diameter 380mm (15 in.)
Nominal Impedance

Minimum Impedance

above Fs HLS38UL-16: 16 ohms ±10% (25°C)
Power Handling Capacity*
Sensitivity*
Frequency Range
Highest Recommended

Crossover Frequency
Effective Piston Diameter 330mm (13 in.)
Displacement Limit (p-p)

Voice Coil Diameter
Voice Coil Material
Voice Coil Insulation
Voice Coil Winding Depth
Top-Plate Thickness
BI Factor

Effective Moving Mass
Flux Density
Polarity

2

HLS38UL-8: 8 ohms
HLS38UL-16: 16 ohms

HLS38UL-8: 8.0 ohms ±10% (25°C)

1

500 watts continuous pink noise (AES standard)
98dB SPL (1W/1m)
30Hz to 3,000Hz
1,000Hz

40mm (1.6 in.)
72mm (2.8 in.)
Edgewound copper ribbon
Aluminum
25mm (1.0 in.)
12mm (0.47 in.)
HLS38UL-8: 21.1 N/A

HLS38UL-16: 27.3 N/A

0.090kg
14,200 gauss
Positive voltage on plus (RED) terminal gives

forward diaphragm motion.

THIELE-SMALL PARAMETERS
fs
Re

Qts
Qms
Qes
Vas
Sd
Xmax

Vd

no (half space)

Pe (Max)
MOUNTING DATA
Overall Diameter

Bolt Pattern Diameter

Baffle Cutout Diameter

Depth 194mm (7.64 in.)
Loudspeaker Volume
Weight
Standard Accessories

Notes

1. *1AES Standard IS 60Hz to 600Hz continuous pink noise, at -12dB/Octave cut-off, and with a
6dB crest factor, measured for 2 hours, with the unit suspended in free air.

2. *Sensitivity is based on a band-limited (100 to 800Hz) pink noise signal.

3. Specifications are subject to change without notice.

40Hz
HLS38UL-8: 5.8 ohms

HLS38UL-16: 11.6 ohms

0.26

2.3

0.29
180 lit. (6.36 ft

0.086m2 (133 in2)

7.7mm (0.30 in.)
660cm3 (40.3 in3)

3.9%
500 watts continuous pink noise

407mm (16.0 in.)
370mm (14.6 in.)
Front Mount: 354mm (13.9 in.)

Rear Mount: 350mm (13.8 in.)

6 lit. (0.21 ft3)

13kg (29 Ibs.)

Mounting screws, washers and nuts: each 8

3

)

APPEARANCE AND DIMENSIONAL DIAGRAM

8-7mm (0.28”) x 15mm (0.59")
8 equally spaced at 45°

172mm (6.8”)

194mm (7.7”)

ARCHITECT’S AND ENGINEER’S SPECIFICATIONS

The low-frequency loudspeaker shall be TOA Model HLS38UL-8/16 or
approved equivalents. The loudspeaker shall have a 380mm (15 in.)
nominal diameter, with a bolt pattern diameter of 370mm (14.6 in.), a
weight of 13kg (29 Ibs.), and a depth of 194mm (7.64 in.). The loudspeaker
shall have a rigid diecast aluminum frame that shall permit front or rear
mounting. The loudspeaker shall have a 500 watts, AES Standard power­handling capacity and a uniform frequency response from 30Hz to
3,000Hz, with a recommended crossover frequency of 1,000Hz or lower to
obtain smoothest overall system response. Band-limited (100 to 800Hz)
pink noise sensitivity shall be 98dB SPL (1W/1m). Nominal impedance
shall be 8/16 ohms. The loudspeaker shall employ a low-mass 72mm (2.8
in.) diameter voice coil of edgewound copper ribbon of 25mm (1.0 in.)
winding depth, on an aluminum coil form, operating in a flux density of
14,200 gauss. The voice coil shall be driven by double ferrite magnets.
Effective moving mass shall be 0.090kg. The cone suspension shall be
made of exceptionally high-compliance, damped-cloth surround

CHARACTERISTIC DIAGRAMS

•Frequency Response and Impedance Curve

FREQUENCY (Hz)

Frequency response is measured in a spherical free-field environment, under 1 watt
& 1 meter conditions, with a swept sine wave signal, while the speaker unit is
mounted in an 120-liter sealed box
while the speaker is suspended in free air, with its cone in the vertical plane

•Distortion Response

The impedanced magnitude curve is measured

Distortion response is measured with a swept sine wave signal, at 50 watts (-10dB
power) & 1 meter, and while the speaker unit is mounted in an 120-liter sealed box.

TOA Corporation

Printed in Japan 833-64-826-60