| Re: Sub testing results confusion...
I'd use Ed's PBPlus review at Secrets to gauge your 20-39 PCPlus - they should be very similar performers.
As for tuning, you can't really determine it based on a sub's FR, as the FR will vary based on enclosure size and any built in EQ/filters/limiters. The THD measurements should be a pretty good reflection though, as the varibales I mentioned won't really affect where the dip in THD takes place, which will be at or very near the tuning point. Based on that, it does appear the native tuning is closer to 25hz than 20hz.
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