TOA hls38ul-8 Guide De Spécification

Nominal Diameter

380mm (15 in.)

THIELE-SMALL PARAMETERS

Nominal Impedance

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

Minimum Impedance

HLS38UL-8: 8.0 ohms ±10% (25°C)

above Fs

HLS38UL-16: 16 ohms ±10% (25°C)

Power Handling Capacity*

1

500 watts continuous pink noise (AES standard)

Sensitivity*

2

98dB SPL (1W/1m)

Frequency Range

30Hz to 3,000Hz

Highest Recommended

1,000Hz

Crossover Frequency

Effective Piston Diameter

330mm (13 in.)

fs

Re

Qts

Qms

40Hz

HLS38UL-8: 5.8 ohms
HLS38UL-16: 11.6 ohms

0.26
2.3

Qes

Vas

Sd

Xmax

Vd

no (half space)

0.29

180 lit. (6.36 ft

3

)

0.086m

2 

(133 in

2

)

7.7mm (0.30 in.)

660cm

3 

(40.3 in

3

)

3.9%

Displacement Limit (p-p)

Voice Coil Diameter

40mm (1.6 in.)

72mm (2.8 in.)

Pe (Max)

MOUNTING DATA

Overall Diameter

500 watts continuous pink noise

407mm (16.0 in.)

Voice Coil Material

Voice Coil Insulation

Edgewound copper ribbon
Aluminum

Voice Coil Winding Depth

Top-Plate Thickness

25mm (1.0 in.)

12mm (0.47 in.)

Bolt Pattern Diameter

Baffle Cutout Diameter

370mm (14.6 in.)

Front Mount: 354mm (13.9 in.)
Rear Mount: 350mm (13.8 in.)

BI Factor

Effective Moving Mass

HLS38UL-8: 21.1 N/A
HLS38UL-16: 27.3 N/A

0.090kg

Depth

194mm (7.64 in.)

Loudspeaker Volume

6 lit. (0.21 ft

3

)

Flux Density
Polarity

14,200 gauss

Positive voltage on plus (RED) terminal gives
forward diaphragm motion.

Weight

Standard Accessories

Notes

13kg (29 Ibs.)

Mounting screws, washers and nuts: each 8

1. *

1

AES 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.

Curve

8-7mm (0.28”) x 15mm (0.59")

172mm (6.8”)

8 equally spaced at 45°

194mm (7.7”)

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 The impedanced magnitude curve is measured
while the speaker is suspended in free air, with its cone in the vertical plane

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 power-
handling 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

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