Thiel ss2 Verweisanleitung

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.

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).

Fig. 5  Subwoofer (attempted) extending to 30 Hz augmenting a 50 Hz reflex main speaker.
No phase adjustment.

Fig. 7  Subwoofer (attempted) extending to 30 Hz augmenting a 50 Hz sealed main speaker.
Optimum phase adjustment.

Fig. 6  Subwoofer augmenting to 30 Hz a 50 Hz a sealed speaker. No phase adjustment.

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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

will give optimum results. They must be adjusted without
rhyme or reason by trail and error

• Optimum results are usually not very good.

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