miniDSP SHD is limited to 2048 filter taps per channel, the miniDSP 2x4 HD has only 1024 filter taps per channel. By contrast, the DePhonica software as up to 128,000 taps per channel and its freeware that runs on Windows.Speaking from experience as I have a pair of LS50's (original) and two Rythmik L12 subs:
Adding a sub to my speakers (and low end performance of the Meta's is the same) makes a big difference. Visible cone excursions disappear with a crossover as low as 90 hz. At one time I had a single Martin Logan sub. I had bass localization problems, possibly from crossing over above 80 hz or some weird room problem. Two subs are much better than one. Beyond that this discussion goes off in a lot of directions about subs in general.
The MiniDSP 2x4 HD is a nice solution as it is the only inexpensive device out there which will do both the high pass and delay on the mains. Plus, it gives system wide eq for sources other than a computer or streamer. SINAD is around 90, not 99 as someone mentioned. This kind of device also has a limited number of taps per filter. Some perfectionists will stick their nose up at this device. Why should I care since I'm using a Crown XLS 1502 with a SINAD of 78. How good is good enough the rest of you can discuss on your own time.
The Crown has a built in 4th order adjustable high pas filter, and some other DSP tricks. It provides just over 1 ms of delay for the mains. The L12's subs have low latency so positioned right next to the mains the timing is good. SVS subs have considerably more latency from their DSP making delay of the mains a more difficult task.
Someone mentioned using a 200 hz crossover. That's ok if you have a sub designed for it like the dual 8" sub Rythmik makes. Typical 12" subs just aren't fast enough to go past 120 hz. Also, a high crossover point means running the subs stereo and getting everything right just gets harder. I tried it going as high as 175 hz. Around 100 works better.
I haven't heard the Metas, but my takeaway from some video reviews is there isn't much difference between a Meta and originals which have been eq'ed to sound like a Meta.
To answer the OP's question, I would prefer a system which can cut it without subs. Integration isn't as easy as some think and there are a lot more things to go wrong. People make a big deal about flat to 20 hz, but other than a pipe organ instruments don't go lower than 28 hz. For whatever reason, when I hear live music bass is somewhat attenuated. Then again, gut punch bass is fun...
I'm really liking this software, it's very easy to use, and it sounds very transparent to my ears. My initial measurements with Dirac Live seem to confirm it's not doing anything harmful to the signal. And yes, my system sounds great with it in the signal path. So much so, I don't see the need for a miniDSP SHD Studio to pair with my Octo 8 Pro.
https://dephonica.com/
Together with something like Equalizer APO, it seems like it can provide a completely free alternative to miniDSP. Just add multichannel DAC.
If anyone is looking for an electronic crossover to pair with LS 50s and sub(s), why not give it a try? It will set you back nothing but time.
Last edited: