Adire Audio KIT281 User manual
KIT281 Assembly Instructions 1
KIT281 Assembly Instructions 1
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
KIT281 Instructions
Adire Audio
1111 Elliott Avenue W
Seattle, WA 98119
206-789-2919
http://www.Adireaudio.com
TABLE OF CONTENTS
1. INTRODUCTION................................................................................................................................................2
2. PARTS .....................................................................................................................................................................2
3. NEEDED TOOLS.................................................................................................................................................2
4. SPEAKER ASSEMBLY.....................................................................................................................................3
4.1. MOUNT CROSSOVERS.....................................................................................................................................3
4.2. CONNECT DRIVERS..........................................................................................................................................3
4.3. MOUNT DRIVERS.............................................................................................................................................3
4.4. TEST, TEST, TEST.......................................................................................................................................3
4.5. ENJOY!..............................................................................................................................................................3
5. SYSTEM TROUBLESHOOTING..................................................................................................................4
6. CABINET PLANS................................................................................................................................................5
6.1. DRIVER LAYOUT.............................................................................................................................................5
6.2.SEALED CABINET PLANS...............................................................................................................................7
6.2.1. Cut Lists..................................................................................................................................................7
6.2.2. Drawings................................................................................................................................................8
6.3. VENTED CABINET PLANS.............................................................................................................................11
6.3.1. Cut Lists................................................................................................................................................11
6.3.2. Drawings..............................................................................................................................................12
6.4. TRANSMISSION LINE CABINET PLANS.......................................................................................................13
6.4.1. Cut Lists................................................................................................................................................13
6.4.2. Drawings..............................................................................................................................................14
KIT281 Assembly Instructions 2
KIT281 Assembly Instructions 2
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
1. Introduction
Welcome to Adire Audio’s KIT281 loudspeaker system. The KIT281 is a high-efficiency MTM system
designed for home audio reproduction, as well as home theater applications. It features two Adire Audio
AV8 midwoofers and a single Audax TM025F1 tweeter per side, which yield an in-room system sensitivity
of 92 dB SPL @ 2.83 Vrms.
2. Parts
Your kit should include the following parts:
Part Qty Use
KIT281/W 2KIT281 woofer crossover
KIT281/T 2KIT281 tweeter crossover
AV8 8” video shielded midwoofer 4Woofers
TM025F1 video shielded tweeter 2Tweeters
SBP two-terminal circular input cup 2Single pair input cup
0.25” female FAST-ON connector 16 Terminal connectors
6/32x0.75” black oxide screw 24 Cup/crossover mounting
Small T-nut/socket cap screw set 8Tweetermounting
Large T-nut/socket cap screw set 32 Woofer mounting
If any parts are missing, please contact the factory as soon as possible, and we’ll correct the shortage.
3. Needed Tools
You’ll need the following tools to assemble the KIT281:
-Philips screwdriver
-7/64” allen key
-9/64” allen key
-Pliers
KIT281 Assembly Instructions 3
KIT281 Assembly Instructions 3
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
4. Speaker Assembly
4.1. Mount crossovers
Using the 6/32 black screws, mount the crossovers in the cabinet, making sure the wires can reach from the
input cup to the drivers.
citors down with the masking tape.
4.2. Connect drivers
Connect the drivers to the crossovers. Simply slide the FAST-ON connectors on the speaker tabs. Make
sure the polarities are all correct.
4.3. Mount drivers
Use the smaller T-Nut sets to mount the tweeters in their holes. Use the larger T-Nut sets to mount the
woofers in their holes.
4.4. TEST, TEST, TEST
Connect the connection wires to the drivers. For the Audax tweeter, note that the positive terminal is the
wider terminal! The narrow terminal is negative. Now mount the crossovers in the cabinets; lay them
down on any suitable brace, or strap them to the wall of the cabinet with masking or duct tape.
Mount the drivers into the cabinets. Now connect the crossover input wires to the terminal cup. Connect
the terminal cup to your amp, and TURN THE VOLUME ALL THE WAY DOWN.
Start playing some music. Turn the volume up VERY slowly. Put your ear in front of the tweeter, to make
sure no bass is coming from it. Likewise, listen to EACH woofer to make sure no really high frequencies
are coming from them.
SLOWLY increase the volume a bit more. Listen to the soundstage, frequency response, and general
timbre of the speaker. If all sounds OK, then continue on to the next step. Otherwise, see section5for
details on tracking down a potential crossover problem.
4.5. Enjoy!
We trust this step is self-explanatory…J
KIT281 Assembly Instructions 4
KIT281 Assembly Instructions 4
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
5. System Troubleshooting
So you encountered a few problems in assembling the speakers. Here are some common tips to check over:
1. Make sure the polarity of the drivers is observed. Reverse connections will create a deep suckout in
the midrange.
2. Make sure the drivers are wired to the outputs of the crossover.
3. Verify that the tweeter polarity is correct: the positive tweeter terminal is the wider terminal.
4. Contact us! We try to answer all questions within one business day. You can reach us at
[email protected], phone at 206-595-3524, or FAX us at 630-839-6192.
KIT281 Assembly Instructions 5
KIT281 Assembly Instructions 5
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6. Cabinet Plans
We provide three basic cabinet plans for you touse: a sealed box, a vented box, and a transmission line
box. Also provided is the basic driver layout, if you decide to build your own box design.
6.1. Driver Layout
Note that this layout is what we designed around. Keep the baffle width the same as shown here, and the
driver locations the same with respect to the upper right hand corner, and you can rest assured that the
crossover will function fine. There’s really no reason to change the XO if the baffle is longer, or the box
alignment changes; those effects will only make a difference in the sub-200 Hz range, where the crossover
has no impact.
KIT281 Assembly Instructions 6
KIT281 Assembly Instructions 6
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 BAFFLE LAYOUT
1200-0011 -
N/A DRAWN BY DCWN/A 1 of 1
Black solid lines are viewable edges
Grey lines are normally hidden from view
Red lines are for dimensions
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
4.5 in
6.75 in
9 in
5 in
10.5 in
16 in
BAFFLE LAYOUT (ROTATED 90 DEGREES TO FIT ON PAGE)
R3.5 in
R4.13 in
R3.5 in
R4.13 in
R1 in
R1.38 in
AV8 Rabbeting not required; if used, rabbet depth is 0.25"
F1 rabbeting not required; if used, rabbet depth is 0.1875"
Maintain driver positioning with respect to corner A
Maintain baffle width of 9" external
Corner A
KIT281 Assembly Instructions 7
KIT281 Assembly Instructions 7
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.2. Sealed Cabinet Plans
The Sealed Cabinet KIT281 is a net 27 liters, stuffed with 16 ounces of polyfill (8 ounces behind the each
midwoofer). This alignment is designed to provide bass extension to 68 Hz anechoic, with a system Qtc of
0.81. The result is a slight bump in the midbass, which is recommended for limited-bandwidth systems.
The higher-Qtc value, in combination with the 68 Hz anechoic extension, will yield typical in-room
extension into the 40 Hz range.
Maximum SPL (driven with 100W) will be in excess of 105 dB SPL (at 1 meter) from 30 Hz and up, which
makes this system well-suited for home theater applications. In addition, the system will handle 100W
continuously over the entire audio bandwidth while remaining within linear excursion limits.
6.2.1. Cut Lists
6.2.1.1. Panel cuts
QTY SIZE USE
222” x 9” Front and back
29” x 12.5” Top and bottom
220.5” x 12.5” Sides
17.5” x 20.5” Vertical internal brace
17.5” x 5.75” Front horizontal brace
17.5” x 6” Rear horizontal brace
6.2.1.2. Hole/baffle cuts
QTY SIZE USE
27” diameter Midwoofer cutouts; cut in front panel
12” diameter Tweeter cutout; cut in front panel
26” diameter Internal air flow; cut in vertical brace
14” diameter Internal air flow; cut in rear horizontal brace
12” x 3.25” Tweeter clearance; cut in front horizontal brace
KIT281 Assembly Instructions 8
KIT281 Assembly Instructions 8
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.2.2. Drawings
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 SEALED CABINET
1200-0012 -
N/A DRAWN BY DCWN/A 1 of 3
Black solid lines are viewable edges
Grey lines are normally hidden from view
Red lines are for dimensions
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
4.5 in
2.25 in
2.25 in
9 in
22 in
R3 in
R3.5 in
R4.13 in
R3 in
R3.5 in
R4.13 in R1 in R1.38 in
7.5 in
10.38 in 9.38 in
4.25 in
5 in5.5 in5.5 in6 in
6.5 in
6.75 in
14 in
9.38 in10.38 in
10.38 in 9.38 in
5.75 in
6 in
5.75 in
6 in
6 in6 in
4 in
3.75 in
1 in
1 in
7 in
8.25 in
2 in
2 in
2.75 in
7 in
8.25 in
Cabinet is 9" wide, 22" high, 14" deep
Construction uses 3/4" thick stock (MDF or better)
Driver rabbets are not required, but shown for clarity if rabbeting is desired
Face and back are completely outset, sides are completely inset, top/bottom are mixed
Internal vertical baffle is perforated with two 6"d holes
Internal rear horizontal baffle is perforated with one 4"d hole
Internal front horizontal baffle is not perforated
FRONT VIEW
SIDE VIEW
One channel shown; mirror image driver layout for other channel
KIT281 Assembly Instructions 9
KIT281 Assembly Instructions 9
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 SEALED CABINET
1200-0012 -
N/A DRAWN BY DCWN/A 2 of 3
Black solid lines are viewable edges
Grey lines are normally hidden from view
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
Cabinet is 9" wide, 22" high, 14" deep
Construction uses 3/4" thick stock (MDF or better)
Driver rabbets are not required, but shown for clarity if rabbeting is desired
Face and back are completely outset, sides are completely inset, top/bottom are mixed
Internal vertical baffle is perforated with two 6"d holes
Internal rear horizontal baffle is perforated with one 4"d hole
Internal front horizontal baffle is not perforated
4.25 in
3.25 in
9.38 in
7.5 in
4.5 in
4.5 in
9 in
10.38 in
7.5 in
R3 inR3 in
6 in
5.75 in 6.5 in
6.75 in
14 in
9.38 in
9.38 in
6 in
4 in
1 in
1 in
3.75 in
2 in
10.38 in
5.75 in
6 in
6 in
10.38 in
FRONT CUTAWAY VIEW SIDE CUTAWAY VIEW
One channel shown; mirror image driver layout for other channel
KIT281 Assembly Instructions 10
KIT281 Assembly Instructions 10
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 SEALED CABINET
1200-0012 -
N/A DRAWN BY DCWN/A 3 of 3
Black solid lines are viewable edges
Grey lines are normally hidden from view
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
Cabinet is 9" wide, 22" high, 14" deep
Construction uses 3/4" thick stock (MDF or better)
Driver rabbets are not required, but shown for clarity if rabbeting is desired
Face and back are completely outset, sides are completely inset, top/bottom are mixed
Internal vertical baffle is perforated with two 6"d holes
Internal rear horizontal baffle is perforated with one 4"d hole
Internal front horizontal baffle is not perforated
7.5 in
R3 inR3 in
3.75 in
3.75 in
7.5 in
4.25 in11 in5.25 in
7.5 in
7.5 in
3.75 in
5.75 in
4.25 in
2 in
3.25 in
3.75 in
3.75 in
3 in3 in 6 in
R2 in
VERTICAL BRACE
VIEWED FROM FRONT
FRONT BRACE
VIEWED FROM TOP
(notch is for clearance
of TM025F1 tweeter)
REAR BRACE
VIEWED FROM TOP
One channel shown; mirror image driver layout for other channel
KIT281 Assembly Instructions 11
KIT281 Assembly Instructions 11
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.3. Vented Cabinet Plans
The Vented Cabinet KIT281 is a net 61 liters, tuned to 28.8 Hz, stuffed with 24 ounces of polyfill (6 ounces
behind the each midwoofer, with the remainder in the lowest chamber of the cabinet, below the vent). This
alignment is designed to provide bass extension to 45 Hz. Additionally, the system will mimic sealed box
with a Q=0.577 (±1 dB) down to 20 Hz. This low-Q response, in combination with the 45 Hz anechoic
extension, will yield typical in-room extension into the 30 Hz range.
NOTE: The KIT281 is NOT supplied with vent tubes! We recommend use of our flared vent kits;
however, you can use standard black ABS pipe (3” ID) for the vents if you so choose. If you choose to
use the flared vent kits, the center tube iscut to 2.5” length. For straight ABS pipe, you want a vent
length of 7.5”.
Maximum SPL (driven with 100W) will be in excess of 105 dB SPL (at 1 meter) from 22 Hz and up, which
makes this system well-suited for home theater applications. In addition, the system will handle 100W
continuously from 25 Hz and up, resulting in near-full range reproduction for a two-way system.
6.3.1. Cut Lists
6.3.1.1. Panel cuts
QTY SIZE USE
248” x 9” Front and back
29” x 12.5” Top and bottom
246.5” x 12.5” Sides
37.5” x 12.5” Horizontal internal brace
6.3.1.2. Hole/baffle cuts
QTY SIZE USE
27” diameter Midwoofer cutouts; cut in front panel
12” diameter Tweeter cutout; cut in front panel
13” diameter Vent output (optionally 5.25” diameter for flared vent kit)
64” diameter Internal air flow; two cut in each horizontal brace
12” x 3.25” Tweeter clearance; cut in front horizontal brace
KIT281 Assembly Instructions 12
KIT281 Assembly Instructions 12
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.3.2. Drawings
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 VENTED CABINET
1200-0013 -
N/A DRAWN BY DCWN/A 1 of 1
Black solid lines are viewable edges
Grey lines are normally hidden from view
Red lines are for dimensions
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
12.5 in 13 in 9.25 in 9.25 in
R1 in
R1.38 in
7.5 in
7.5 in
4.5 in
2.25 in
5 in5.5 in5.5 in15 in17 in
2.25 in
9 in
R4.13 in
R3.5 in
R3.5in
R4.13 in
R1.5 in
R2.63 in
48 in
FRONT VIEW SIDE VIEW FRONT CUTAWAY
12.5 in
12.5 in
4 in 4 in
7.5 in
4 in
4 in
13 in 9.38 in
4 in
2 in
9.38 in
14 in
7 in
8.25 in2.75 in
2 in
8.25 in
7 in
3 in
Cabinets constructed of 3/4" thick stock (MDF or better)
Cabinets are 48" tall, 9" wide, 14" deep external
Driver rabbets are not required, but shown for clarity if rabbeting desired
Tune with a 3"d by 7.5" long vent
Optional flared vent (3"d) outline shown; overall length of 8.5"
Internal baffles perforated with 4"d holes
One channel shown; mirror image driver layout for other channel
1.25 in
2 in
1.25 in
2 in
1.25 in
3.25 in
3.25 in4.75 in4.5 in
2 in
4.25 in
3.25 in
3.75 in3.75 in
7.5 in
10.5 in
R2 in
R2 in
0.75 in 4 in
3.75 in 3.75 in
7.5 in
3.25 in6 in3.25 in
12.5 in
R2 in
R2 in
TOP BRACE
LOWER BRACES
SIDE CUTAWAY
12.5 in
12.5 in
4 in 2 in
4 in
1.25 in 1.25 in
3 in
13 in
12.5 in
4 in
4 in
2 in
1.25 in 1.25 in
7 in
9.38 in
4 in
1.25 in
0.75 in
4 in
2.5 in
2 in 7 in
9.38 in
12.5 in
12.5 in
14 in
48 in
12.5 in
7.5 in
4 in
13 in
7.5 in
4 in
9.38 in
4 in
3.25 in
1.75 in
1.75 in
1.75 in
1.75 in
1.75 in
1.75 in
7.5 in
9.38 in
7.5 in
9 in
48 in
KIT281 Assembly Instructions 13
KIT281 Assembly Instructions 13
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.4. Transmission Line Cabinet Plans
The Transmission Line Cabinet KIT281 is a net 90” long line, tapered from 4.5” width at the top to 3”
width at the terminus. This results in a line tuning of 37.5 Hz. The line is stuffed with 24 ounces of
polyfill in the 4.5” width section, 16 ounces of polyfill in the middle 3.25” wide section, and 8 ounces of
polyfill in the front 3” wide section.
This alignment is designed to provide anechoic response to 35 Hz, with typical in-room response down to
28 Hz. Maximum SPL (driven with 100W) will be in excess of 105 dB SPL (at 1 meter) from 26 Hz and
up, which makes this systemwell-suited for most home audio applications. In addition, the system will
handle 100W continuously from 30 Hz and up, resulting in linear operation over 95% of the audio
bandwidth.
6.4.1. Cut Lists
6.4.1.1. Panel cuts
QTY SIZE USE
248” x 9” Front and back
29” x 12.5” Top and bottom
246.5” x 12.5” Sides
17.5” x 7.25” Horizontal front brace
138.5” x 7.5” Rear line vertical divider
123.25” x 7.5” Front line vertical divider
6.4.1.2. Hole/baffle cuts
QTY SIZE USE
27” diameter Midwoofer cutouts; cut in front panel
12” diameter Tweeter cutout; cut in front panel
17.5” x 3.25” Line terminus; cut in front panel
KIT281 Assembly Instructions 14
KIT281 Assembly Instructions 14
Copyright 1999-2000 Adire Audio. All Rights Reserved. This design is for private, non-retail/non-
commercial use only. Any use of this design for profit, in any way shape or form, without the express
written consent of Adire Audio is strictly prohibited.
6.4.2. Drawings
TITLE
DWG NOSIZE REV
SHEETSCALE
CAGE CODE
A
KIT281 TRANSMISSION LINE CABINET
1200-0014 -
N/A DRAWN BY DCWN/A 1 of 1
Black solid lines are viewable edges
Red lines are for dimensions
Blue lines are for construction/reference
Green lines are text/labels
LEGEND:
Copyright (C) 1999-2000 Adire Audio.
All Rights Reserved. Commercial use or
reproduction of this design without the
express written consent of Adire Audio
is strictly prohibited, and punishable by law.
CONSTRUCTION NOTES
FRONT VIEW SIDE VIEW FRONT CUTAWAY
Cabinets constructed of 3/4" thick stock (MDF or better)
Cabinets are 48" tall, 9" wide, 14" deep external
Driver rabbets are not required, but shown for clarity if rabbeting desired
SIDE CUTAWAY
One channel shown; mirror image driver layout for other channel
Stuff line with 48 ounces of polyfill
4.5 in 7.25 in
7 in2 in7 in
19.75 in
14 in
2.75 in
3.5 in 3 in
23.25 in
3.5 in
8.75 in
38.5 in
3.25 in
5 in5.5 in5.5 in28 in3.25 in
48 in
7.5 in
26 in
4.5 in
2.25 in
2.25 in
9 in
R3.5 in
R4.13in
R1 in
R1.38 in
R3.5 in
R4.13 in
19.75 in
12.5 in
4.5 in
4.5 in
12.5 in
4.5 in
38.5 in
15.25 in
19.75 in
7 in2 in7 in
2.75 in
3 in3.5 in
23.25 in
3.5 in
3.5 in
8.75 in
3.5 in
7.5 in
22.5 in 15.25 in 4.5 in
9 in
48 in
14 in
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