HTP-1 Installation and User Guide Release 1.8.1
HTP-1 bass management system. The Dirac Live Bass Control option can replace this system with Dirac’s
proprietary system.
Most speaker setups will use small speakers. If you are not sure if the speakers are small or large then
they are probably small. A large, full-range speaker does not need a subwoofer to produce the lowest
frequencies. Selecting the “Small” toggle switch causes the bass manager to redirect the lowest
frequencies to the subwoofer(s). This protects the small speaker and allows it to operate more
efficiently. Many speaker manufacturers will provide the frequency response of their speakers. For
example “60Hz to 18KHz” indicates that the speaker is not designed to produce sounds below 60Hz, or
so. In this case you would want to set the corner frequency of the high pass filter to 60Hz or maybe 10Hz
above the cutoff. Choosing a cutoff that is clearly in the linear region of the speaker ensures that the
crossover operates as designed and is not affected by the natural filtering of the speaker. The HTP-1
uses a fourth-order Linkwitz-Riley crossover.
The settings of the speaker sizes do not affect the Dirac® calibration. The bass manager runs before the
Dirac® filter. The Dirac® calibration ensures that the signal sent to the speakers is reproduced as
intended. After doing the Dirac® calibration you can see the cutoff frequencies measured on your
speakers and then complete the configuration of the “Speakers” page by filling the corner frequency for
each pair of speakers. Ideally the corner frequency chosen on the speaker setup page is 5 or 10 hertz
above the frequency at which the speaker begins to roll off. That way you use the fourth-order
Linkwitz-Riley electronic crossover provided by the HTP-1 and don’t rely on the less predictable behavior
of the speakers.
A Dolby® Enabled speaker behaves like a “small” speaker except when a Dirac® calibration is performed.
The calibration preserves the special filters used in Dolby® Enabled speakers.
A link at the top of the page opens to a diagram of the back panel with the speaker assignment labeled.
This assignment can vary as you use all 16 of the possible 20 speaker channels.
Enabling Speakers
When you first open the SPEAKERS tab, only the front left and right speakers are enabled. The switches
will not allow you to select an unsupported speaker configuration. Refer to the Valid Speaker
Configurations
section above for supported speaker configurations. HTP-1 follows rules set by the Dolby
and DTS decoders. Some of the rules are:
● The L/R rear surround speakers cannot be enabled until the L/R surround speakers are enabled.
● The L/R wide speakers cannot be enabled until the L/R rear surround speakers are enabled.
● Subwoofer 3 cannot be enabled until subwoofer 2 is enabled.
● You cannot have only rear upper speakers. If you have only two upper speakers they must be
front or middle.
● There is no “high” middle speaker. If you want to have six upper speakers, the middle pair will
be configured as “top."
● If you have four upper speakers they must be front and rear. The top middle pair can be used
alone (.2) or in a six upper configuration (.6).
HTP-1 User Manual Page 34 V1.8.1
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