OWNER’S MANUAL
OWNER’S MANUAL
Troubleshooting
Technical Specifications
Problem
Possible Cause(s)
Solution
Distorted output
Source unit/amplifier gain set
Re-calibrate amplifier with source unit
Competition Pro TL-1121 dual 2 ohm voice coil
12” Subwoofer specifications:
too high
Parameter
Data
Unit
Info
Source unit is not capable of
Replace/upgrade source unit
Nom. diameter
12
[inch]
Nominal diameter (30 cm)
good audio reproduction
Vas
54.957
[Litres]
Equivalent volume
Qts
0.807
Total Speaker Q-factor
Speaker(s) blown
Disconnect speakers one at a time to
Qes
0.905
Electrical Q-factor
pinpoint defective speaker
Qms
7.339
Mechanical Q-factor
Fs
21.935
[Hz]
Resonance Frequency (Free Air)
Enclosure too small
“Encl
Replace encl
osures” secti
osure for l
on of
arger
manual
one (se
for furthe
e
r
Sensitivity
90.659
[dB]
SPL dB at 1W, 1m
information).
Max Power
3000
[W]
Maximum input power
RMS Power
1000
[W]
RMS input power
Bass is weak
Dual voice coils on subwoofer
Try swapping over + and – on one of the
xmax
20.32
[mm]
Max excursion from centre at normal operation
wired out of phase
voice coil connections
(one way)
Moving mass
278.9
[g]
(Mms) Weight of moving parts
Bad speaker connections
Check speaker connections at subwoofer
Disp area
0.0434
[m2]
(SD), Effective piston area of cone
and amplifier ends
Disp Vol
1763.8
[cm3]
Displaced volume = xmax x 2 x SD
Coil diameter
76.4
[mm]
Diameter of the voice coil (Kapton 4-layer - 3")
Subwoofers connected out of
Check the + and – connections all match,
Cms
0.1888
[mm/N]
The stiffness of the driver’s suspension
phase
swap to test
Magnet weight
5102.9
[gr]
Weight of the magnet (180 oz)
Re
1.785
[ohm]
DC resistance (per voice coil)
Eq settings are reducing bass
Verify all eq settings on amplifier and
Z
2
[ohm]
Impedance of coil (per voice coil)
power
“LPF” sett
source uni
i
t, especi
ngs on am
ally “sub
plifier
sonic” and
L
Bl
27.529
2.23
[Tm]
[mH]
Inductan
Magnetic strength (
ce of coil (per coil
Motor forc
@ 1 kHz)
e factor)
Poor quality amplifier
Use TL-1023 for one TL-1121
Recommended sealed
0.0623
[m3]
(2.2 cubic feet)
Use 2x TL-1023s for two TL-1121s.
enclosure
Minimum sealed enclosure
0.034
[m3]
(1.2 cubic feet)
Recommended ported
0.0623
[m3]
(2.2 cubic feet)
enclosure
If your subwoofer is still not functioning correctly after checking through the
Minimum ported enclosure
0.0425
[m3]
(1.5 cubic feet)
“troubleshooting” section, please contact our support team at:
Krm
2
[m]
Kxm
2.58
[mH]
Rem
5.31
Erm
0.984
Exm
0.656
P max
3,000
Watts
Maximum peak input power
P rms
1,000
Watts
Maximum RMS input power
Magnet material
High density strontium-ferrite
Cone/dust cap material
Dynaflex
Surround material
Santoprene Rubber
Aluminium shorting ring
Yes
Heat sink
Yes
Mounting depth
282 mm
