Thiel ss2 Guide De Référence
If you want the sub to augment the main speakers,
without adding a high pass into their response, the results are
usually even less desirable. If the main speaker is a reflex
type at 50 Hz and the sub extends to 30 Hz, the bass is very
weak without a phase adjustment (Fig. 5); the polarity must
be reversed to get good results.
usually even less desirable. If the main speaker is a reflex
type at 50 Hz and the sub extends to 30 Hz, the bass is very
weak without a phase adjustment (Fig. 5); the polarity must
be reversed to get good results.
In the case of augmenting a sealed system, it is usually
not possible to obtain good results. For example, a 50 Hz
speaker will produce a severe null at the crossover frequency
without a phase adjustment (Fig. 6). Even with optimum
phase and level, the results are an exaggerated mid bass and
a lack of deep bass (Fig. 7).
speaker will produce a severe null at the crossover frequency
without a phase adjustment (Fig. 6). Even with optimum
phase and level, the results are an exaggerated mid bass and
a lack of deep bass (Fig. 7).
Fig. 5 Subwoofer (attempted) extending to 30 Hz augmenting a 50 Hz reflex main speaker.
No phase adjustment.
No phase adjustment.
Fig. 7 Subwoofer (attempted) extending to 30 Hz augmenting a 50 Hz sealed main speaker.
Optimum phase adjustment.
Optimum phase adjustment.
Fig. 6 Subwoofer augmenting to 30 Hz a 50 Hz a sealed speaker. No phase adjustment.
9
These examples illustrate the typical problems inherent
in matching a subwoofer to other speakers:
• “Logical” settings do not give the desired results
• It is not known which level and phase control settings
• It is not known which level and phase control settings
will give optimum results. They must be adjusted without
rhyme or reason by trail and error
rhyme or reason by trail and error
• Optimum results are usually not very good.
-15
-10
-5
0
5
10
100
1000
F r e q u e n c y
Amplitude - dB
-15
-10
-5
0
5
10
100
1000
F r e q u e n c y
Amplitude - dB
-15
-10
-5
0
5
10
100
1000
F r e q u e n c y
Amplitude - dB