Sherwood R-972 User Manual download pdf (Page 11)

R972 Trinnov Optimizer Application Notes Curt Hoyt trinnov.com

Ver 2.6.1 Page 11 3/12/12

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

borrow some small Sats and find a way to hang them and calibrate. Listen in all the seats. Compare with 7.1- if you can.

Mockups can help you optimize it all- even if it’s done with open studs and the like.

IMPORTANT: The R972 Manual specifies use of speakers of 6 ohms or above. If connecting two speakers to a single amp

out, consult the speaker's impedance chart: many speakers drop below rated impedance. It's not OK to connect two 6

ohm loads in parallel to an amp rated at 4 ohms. Wiring speakers in series may raise the impedance to acceptable levels.

Overloading the outputs may damage the amps. Be sure to use speakers with higher impedance rating and sensitivity, or

better, add additional amps off the pre out.

Calibrate, then listen to SPATL in 2D and 3D for best results. Note, with this configuration, you must use SPATL 2D or 3D,

as Trinnov corrects for the irregular routing.

Stereo

Analog in- Trinnov in Stereo Only

2 channel in works fine with Trinnov correction. The Direct 7.1 in does not have A/D circuits needed to run Trinnov.

Using a mono Y cable to feed a single channel to L/R is a great way to test imaging stability, corrected vs. uncorrected.

Stereo Full Range Pairs

One benefit of Trinnov correction is that it works well on stereo speaker pairs: the correction uses the most

sophisticated method used in correction used today: both FIR and IIR filters on all channels- resulting in full range

correction on large speakers. This is not a common feature amongst most correction systems available today.

If you combine large L/R speakers and Satellite speakers with Subwoofers for movies, but want to listen to your stereo

recordings over only your large stereo pair, you can do this easily by taking a Cal of the “surround configuration”

followed by a Cal of only the large L/R speakers (disconnect temporarily all other speakers).

Stereo with Subs

The opportunity to improve your large speakers comes from separating two key tasks of reproduction: imaging and taming room

modes. Using separate Subs allows no compromise in staging the mains for imaging and the Subs for minimizing room modes,

particularly in smaller rooms. If you only use the R972 for stereo, you can have a preset for mains alone and another for mains +

Sub(s), providing the low end reach when desired.

Stereo using a pair of Satellite/Bookshelf plus Full Size Speakers as Subs in a Stereo

Configuration

If you have some sealed box speakers with 10-15in woofers that have low bass extension that are not being used, you can effectively

use them with the R972 amps as Subwoofers. (This assumes you have 2 of the 7 amp channels available.) I did this, using a pair of

15” in my office system as Subwoofers combined with 2 way bookshelf speakers. The smallish 15”s are tucked away where the Subs

have the most effectiveness, and the bookshelf speakers are placed for imaging. I’ve configured the R972 to use the (2) “rear/mulit-

room amps as Sub amps by using a Y splitter to feed the amps from the Sub output. You set the multi-room input to a previously

unused input, connecting the Y splitter to this from the Sub out. You can use the multi-room level to trim the Sub level. Once you

have this configuration setup, you can run the Trinnov Calibration in the normal way. Of course, it helps to have efficient “Subs,” as

you will only get so much power out of the back amps, but I can say it works well in my office, and it’s more efficient then running

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Sherwood R-972 User Manual Page 11