HTP-1 Installation and User Guide Release 1.8.1
when doing a couch calibration, I take the first measurement in the sweet spot with the mic tip
41 inches high, the next 8 measurements with the mic tip at around 49 inches high, and the
remaining 8 measurements with the mic tip around 33 inches high. While it's not necessary to
be this precise with mic heights besides the first position, it helps me to have a quick and simple
process to follow with every calibration.
●
No two mic positions should be too close to each other (~1ft), and no mic positions should be
reused to take multiple measurements in the same position.
●
No mic positions should be too close to any reflective boundary (~1ft) if possible. If seat backs
are very close to any mic position, it can help to fully recline all seats while performing the
calibration. This made a big difference on my particular setup and I always recline my seats
when performing Dirac calibrations now.
●
For every mic position, the mic tip should have an unobstructed line of sight to every speaker
(besides subwoofers) if possible. Reclining my seats helped me achieve this with some of my
rear speakers.
In our experience, following the guidelines above results in calibrations that are highly repeatable.
Manual Calibration
The system can be calibrated manually. The Dirac calibration is preferred as it is very accurate and quite
simply executed. Users who are familiar with the manual calibration process are directed to the
calibration page where delay and trim values can be entered. The details of a manual calibration are not
covered here.
Set delay using 1 millisecond per foot.
Set trim using an SPL meter and a pink noise source from a common blue ray disk.
Calibrating for Higher Sample Rates
The Dirac filters do not run at sample rates above 48kHz. A high quality sample rate converter is
engaged to drop the sample rate to the 48k range when the Dirac filter is active. The Dirac Bypass
setting uses the delay and trim values associated with a Dirac preset without engaging the main Dirac
filter and the sample rate converter. And of course you can turn the Dirac filter off and use only the user
delays and trims. You might choose to reserve one filter slot just for a “user only” set of delay and trim
values.
Dirac Live Bass Control
HTP-1 software version 1.7 introduces support for Dirac Live Bass Control. The purchase of an HTP-1
conveys the basic license for Dirac Live, but this does not include the advanced aspects of Dirac Live Bass
Control. Without enabling DLBC, the HTP-1 uses its standard bass manager to redirect low frequency
energy from smaller satellite speakers to the subwoofer(s). Licenses for DLBC are purchased on the
Dirac website (
https://live.dirac.com/home-audio/
). When you have an updated license, the upper right
corner of the Dirac Live 3.0 program shows a control that looks like this:
HTP-1 User Manual
Page 56
V1.8.1
