Sherwood R-972 User Manual download pdf (Page 7)

R972 Trinnov Optimizer Application Notes Curt Hoyt trinnov.com

Ver 2.6.1 Page 7 3/12/12

Use suggestions in this document at your own risk. Always consult your Sherwood R972 Operating Instructions.

(2) Speaker placement recommendation - place speakers aiming at the microphone/listening area. This includes L/R

speakers. This can be critical for the Cal process of “finding loudspeakers,” and will give best Trinnov Remapping

performance in 2D and 3D over the broadest listening area. Speakers are localized, “found” from direct high frequency

radiation. Speakers that have appreciable high frequency roll-off may not be found during Calibration if not aimed directly

at the microphone. This can occasionally be a problem for ceiling speakers that beam high frequencies away from the Cal

mic. The best in wall/ceiling speakers are those that can be aimed. Dipoles are usually ok, but can fail to be found for the

same reason. See the notes below for powered and planar speakers.

(3) Speaker Localization- If speakers are not found, try these tips: (1) look for any occlusion that may occur in the line of

sight from mic to speaker, such as high chair backs. (2) Listen to the Cal sequence from the mic position (always moving to

remain behind the mic for the speaker being measured)- you will hear if a speaker is noticeably different. (3) Try swapping

positions with a known “good” speaker that is consistently found. You’d be surprised how many damaged speakers have

been identified this way.

(4) External amplifiers- insure that the amplifier/speaker combination is at a comparable level during Cal to using the

internal amp. There has to be a reasonable output (SPL) for an effective Cal. See tip (5) of this section.

(5) Subwoofer Localization- Trinnov only measures level and distance for the Sub. The localization of the Sub is not

needed or possible due to the low frequencies. If you get angles for the Sub, this is an error- repeat the Cal. If you confirm

the error, you may want to update the firmware or contact Sherwood support.

(6) Bass Management Auto Crossover – The crossover frequency will be determined by the midpoint between the

lower roll-off of the Sats and high roll-off of the Sub(s). If the crossover seems too low, it’s because your Sats have lower

extension, and your Sub may be low passed (cabinet or filter). To raise crossover, raise or turn off the low pass filter on

your Sub and retry the Cal. Note: The higher the crossover, the more SPL your system will handle. The lower the

crossover, the less localization of bass. In the case of wide bandwidth Subwoofers- going beyond 300Hz, the auto level

calibration may not function correctly, producing strange results in the level calculation.

EQ- Target Curves & firmware modification of Sub level +3, +6 dB

The R972 has (4) target curves that may be applied the Trinnov correction. In addition, a Cinema curve may be overlaid to any

of these. (see R972 manual) By combining the possibilities, you should find something that works well.

More Bass, Firmware modification. There is a prevision for adding +3 or +6 dB to the Sub output as part of the Trinnov

Calibration via firmware updates. There are two firmware modification files, called +3 and +6. When installed, they add +3 or

+6 dB, respectively, to the Sub/LFE output on all (4) trinnov target curves. The firmware updates have no effect on the speaker

outputs. Contact Sherwood directly for the firmware modification files and instructions. Beyond the firmware modification

files, no other provision for updating or changing the existing curves exists. If you prefer more bass, as an alternative the the

firmware mod files, you can raise the Sub level after Calibration with the same results (just harder to set manually). You’ll get

best results by noting where the Sub level was (I use blue tape to mark), then making small incremental changes.

Calibration Microphone

(1) The calibration microphone is made of four capsules vertically aligned to form a tetrahedral (equal sided

triangles). It is powered from the R972 via the cable and is automatically tested as part of the calibration

sequence. Using other microphones will not provide correct results and may damage components.

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Sherwood R-972 User Manual Page 7