Sherwood R-972 User Manual download pdf (Page 6)

R972 Trinnov Optimizer Application Notes Curt Hoyt trinnov.com

Ver 2.6.1 Page 6 3/12/12

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

(4) What to do if system can’t find a Subwoofer- A Subwoofer’s energy is considerably limited compared to

loudspeakers because of their narrow frequency band. If the Sub is not found (more then three bursts), consider the

following adjustments: turn off or raise any low pass filter on the Sub, and/or raise gradually the level of the Sub till it is

recognized. If the Sub has it’s own active correction, try bypassing it: Trinnov’s proprietary low frequency correction works

in a number of ways to improve performance and may likely exceed what the Sub’s correction can do on it’s own. Always,

trust your ears.

(5) Trinnov Level Adjustments- Trinnov will automatically reduce overall gain in order to keep full digital

headroom. The gain reduction is computed based on two key factors: (1) level differences between speakers.

Trinnov level matches all speakers and the difference between them must be accounted for in the overall level

(2) correction and Target boost, as much as 6dB. Between the level and EQ corrections, there can be a

difference of 16dB or more. If the overall level is not reduced, digital distortion could result. Things you can do

to reduce the drop: Get your Sub levels manually close to where it needs to be to match Sats (Radio Shack meter

it with the built in tones). Avoid having unequal speaker levels, such as speakers with different efficiencies, or

speakers way far away that need unusual amounts of boost. Bottom line: as long as you are able to drive the

system to the levels you are looking for, and it sounds clean, you'll be OK with the kinds of drops you are seeing.

If you clean it up a bit, let us know how it goes- particularly if you find it worth the effort for others.

(6) Experiment with extra channels - If you are particularly interested in 3D remapping and acoustic image possibilities,

experiment using all channels. As an example, if your HT setup is a typical 5.1 layout and you have an extra pair of

speakers, they don’t need to be placed in a traditional 7.1 configuration for the optimal listening experience. Try using the

extra two channels in other ways, such as to add front wide or height (front or back). The 3D remapping will determine

where the speakers are and provide an appropriate signal. If done right, the speakers will seem to disappear, leaving a

seamless image. 2D and 3D. 2D is horizontal spatial correction only. 3D spatially corrects both horizontal and vertical

planes. Listen to both to decide what works best for your given situation. The ability of the Trinnov to correct spatiality is

dependent on speaker placement. While ideal placement is not required, the spatial correction is most effective when

there are speakers nearby to support the “building” of the image. If you want to raise the sound image in the front, you

have to have an elevated speaker. As an example, if all speakers are on the floor, then the image can’t be raised.

Calibration and Setup Notes

(1) Trinnov Imaging correction 2D/3D-- Trinnov corrects for spatial errors caused by incorrect placement of

the loudspeakers both horizontally – 2D and vertically 3D. The correct images are built from your speakers:

therefore, if you want to have imaging- horizontally or vertically, you will need to place speakers in the general

area to support the forming of an image. If your front speakers are on the floor, and the side and rears are in

the ceiling, the resulting image will be tilted. You will not be able to raise the front image by having speakers in

the rear elevated. Again: if you want to improve imaging in a given direction- horizontal or vertical, you must

place a speaker in the area to support it. See section (6) above.

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Sherwood R-972 User Manual Page 6