Boston Acoustics GTR12 User Manual

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GTR - TunableRadiators

Changing the tuning on the GTR TunableRadiators

Note: The GTR TunableRadiatoris shipped from the factory in “Tuning Mode #2”.

1.Remove the dustcap.

2.Remove the center screw, lock washer, and washer that hold the mass to the GTR.

3.Select the desired tuning mode by placing the correct combination of mass, foam side down, on the center shaft. (use the tuning guide located below)

4.Install the center screw, lock washer, and washer and tighten.

5.Install the dustcap using all five screws.

Warning: The dustcap is a structural part of the GTR TunableRadiatorand must be installed before use.

GTR TunableRadiatorTuning Frequency Chart

For single recommended G5/GTR enclosures

Tuning Mode:

 

GTR12

 

GTR10

Enclosure Volume:

 

1.0 Ft3

 

0.5 Ft3

Tuning Mode 1:

 

45Hz

 

49Hz

Tuning Mode 2:

 

35Hz

 

35Hz

Tuning Mode 3:

 

30Hz

 

30Hz

Weight Chart

Small Tuning Mass

Large Tuning Mass

 

 

 

 

 

Tuning Mode 1:

X

X

Tuning Mode 2:

1

 

1

 

Tuning Mode 3:

X

2

 

Key:

X = No Mass Used

1 = One Mass Used

2 = Two Mass Used

GTR TunableRadiatorTuning Hardware

Screw*

Lock Washer*

Washer*

Small Tuning Mass*

2 x Large Tuning Mass

(1 installed* / 1 in hardware pack)

*Pre-installedon GTR from factory

Subwoofer w/ GTR Enclosure Shape Examples

Listed below are several single G5 subwoofer using a GTR TunableRadiatorenclosure shape examples.

Trapezoid

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Side

 

Top

 

Reverse

Top

Front

Rectangle

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Side

 

Top

Wedge

Side

Front

Square with Down-firingGTR

Side

Front

Single Enclosure Design Example

- GTR TunableRadiator

D

In

onse w/ Q ne

W

E

ponse

 

dB

 

 

6

 

 

0

 

 

-6

 

H

-12

 

 

-18

 

 

-24

 

 

-30

 

 

-36

 

5 Hz

 

10

 

50

 

100

Model:

12" w/ GTR12

10" w/ GTR10

H = Height:

13" (33.0cm)

9.5" (24.1cm)

W = Width:

13" (33.0cm)

9.5" (24.1cm)

D = Depth:

10.5" (266.7cm)

9.75" (24.8cm)

Gross Volume:

1.0 Ft3 (28.3L)

0.5 Ft3 (14.2L)

GTR Tuning / Q-Tune Setting Matrix:

 

Model:

12" w/ GTR12

10" w/ GTR10

Tuning Mode 1:

45Hz / 42Hz@0.7

50Hz / 45Hz@0.7

Tuning Mode 2:

35Hz / 34Hz@1.0

35Hz / 34Hz@1.0

Tuning Mode 3:

30Hz / 30Hz@1.2

30Hz / 30Hz@1.2

Enclosure dimensions are internal and include basket and GTR displacement

Tuning Assumes Boston G3, G2, or G1 Subwoofer

These enclosure shapes are examples and these dimensions can be modified provided that the exact internal volume is retained and that there is adequate space behind the woofer and the GTR.

34-inchthick M.D.F. is recommended as a minimum

*Recommended distance from sides and back walls of enclosure

†Q-Tune™is a feature found on Boston GT Amplifiers

Factory Tuning Mode

GTR TunableRadiatorIncluded Hardware

Model:

GTR12

GTR10

Hex Key 2.5mm

1

1

T-NutM4:

8

8

Lock Washer M4:

8

8

Mounting Screw M4:

8

8

Wood Screw M4 x 38mm:

8

8

Also included with all GTR TunableRadiatorsis the GTR Tuning Hardware, these parts are individually listed in the GTR TunableRadiatorTuning Hardware section.

Boston Acoustics, Inc. 300 Jubilee Drive, Peabody, MA 01960 USA

T: 978.538.5000 F: 978.538.5100 W: bostonacoustics.com

Q-Tune,SureSet, and TunableRadiator are trademarks and Boston, Boston Acoustics, and the Boston Acoustics logo are registered trademarks of Boston Acoustics, Inc. Specifications are subject to change without notice.

All rights reserved. Covered by patents issued and/or pending. © 2004 Boston Acoustics, Inc.

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