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Here's why I said not to use the receivers built in test tones You can see that they also disagree on how hot I'm running my subwoofer by about 1.5dB but this is less of an issue as I set it by ear after calibrating to reference anyway. 25dB of each other, while the narrow frequency band used by the S&M disc reports that there's over 1dB difference and would have me set them incorrectly. Here's a comparison between the AIX and S&M discs Īs you can see, they're both pretty similar but according to the frequencies used by the AIX disc all my speakers are within. By encoding this channel 10dB lower, all channels should measure the same SPL once the receivers 10dB boost is factored in, thus reducing the likelihood of someone reducing their sub trim thinking that it's 10dB too hot.Īs to the differing results, it's because they use a narrow bandwidth signal to measure as suggested by Rambles. The LFE channel gets an additional 10dB boost in the receiver, which could cause confusion among users who aren't aware of this. Still, who would have ever thought such an innocuous setting could have that kind of power?Ĭlick to expand.Technically DVE, but I can understand why Spears & Munsil chose to encode the LFE 10dB lower (AIX do the same). Again, to make the most out of this tool, one does need the ability to take measurements. Adding or subtracting a couple feet from the distance of your subwoofer is a viable way of getting rid of an ugly peak or dip around the crossover point. Above and beyond this, the distance adjustment functions as a phase control of sorts.
![spears and munsil disc audioholics spears and munsil disc audioholics](https://i.ytimg.com/vi/V0hj5_9HSiI/mqdefault.jpg)
![spears and munsil disc audioholics spears and munsil disc audioholics](https://i.imgur.com/B1d8FHG.jpg)
Note, the distance reported by your receiver’s auto-calibration will be inclusive of any delay caused by signal processing happening inside the subwoofer (EQ, low pass filtering, etc.), which can add several feet to the distance per your tape measure. Obviously the primary job of the distance setting is setting a delay relative to your other speakers. Seriously, how important can this be? You let auto-calibration take care of this for you, or if you’re feeling particularly hands on, you might whip out the tape measure, right? A word of wisdom: don’t underestimate the power of the distance setting in your A/V receiver.