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How low can I cross the SB Acoustics SB29SDAC-C000-4?
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Re: How low can I cross the SB Acoustics SB29SDAC-C000-4?
The SB29RDNC's produce an amount of 2nd order harmonics below 4khz, but that's typically not offensive. You probably want to cross at ~2,250-2,500hz to get the best out of them.
Here's how their THD looks at around 8 actual watts (which is pretty loud):
You can see 2nd order harmonics crosses the 1% threshold around 4khz. Odd order harmonics don't become much of an issue until around 1700khz at that power level. You'll be only putting out about 25% of the power with an LR4 crossover around 2.4-2.5khz at that frequency, which means your odd order and 2nd order harmonics will look a lot more like this at ~1600khz and further improve below:
So 2nd order harmonics will probably be in the -35db range (~1.77%) and odd order harmonics will be far below that with the most prominent being 3rd order at around 0.25% THD.
In other words, this should be a good performer and the 2nd order harmonics will likely just add a "warm" sound to the overall signature. I'd give between 2.25 - 2.5khz LR4 a try and see what matches your listening levels the best.
2017 Chevy Bolt EV - Work in Progress: Scanspeak D3004/6040-10 Beryllium tweeters, Scanspeak 12mu mids, Scanspeak 18wu midbasses, Scanspeak 32w/4878T00 13" Subwoofer, Scanspeak 10F / D3004/6020's (rear doors), Scanspeak 10F (rear fill). MiniDSP C-DSP 8x12 v2 DL, Arc Audio KS 300.2 v2, Arc Audio SKS300.6 Prototype, Arc Audio KS300.4 v2
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