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You may want to consider the concept of power bandwidth. The out of band crossover range presents a high impedance to the amplifier where little power (current) is dissipated. Simply put, each amplifier delivers power only in its applied range. As most modern solid state amplifiers are constant...

For example some people mignt prefer a warmer sounding (tube like) for the high range and a very tight (high damping factor) amp for the low range.

There are pros and cons to bi-amplifying the passive crossovers in your speakers: One benefit of bi-application is that it increases the overall deliverable power to your speakers. It also allows you to choose / optimize the characteristics of your amplifiers to the high or low frequency range...

The reason is, if you wanted to sum inputs from the two different channles you could mix them at independent levels, see:

If you wish to retain the Benchmark DAC you could use a miniDSP SHD Studio or Flex Digital which are both digital in and out. You would put that in the chain before the DAC3. One drawback to that solution would be that it would require a second two channel DAC if you have subwoofers. miniDSP...

As you are using the excellent DACs in the miniDSP SHD, you should go digital in, this way you will avoid a double conversion, see: The Best Ways to Avoid Unnecessary Digital to Analog

We have a video that covers this topic: Interconnect Cable Considerations

@GXAlan Here is our FAQ on the topic: "What is the impact of the new tariffs on products sold by Deer Creek Audio?"

We just published a new tech blog that provides an overview of miniDSP's Device Console, this covers the 2x4 and 2x8 architectures: Overview of miniDSP Device Console

@GXAlan The administration's new tariffs for China and Hong Kong are a volatile situation with things changing daily. miniDSP is located in Hong Kong and from there ship items which have country of origin (COO) both Hong Kong and China. So depending on the country of origin of an item...

The miniDSP HTx is a great Dirac enabled solution for a 2.4 system: https://deercreekaudio.com/products/ols/products/minidsp-flex-htx

We have a new Tech Blog on integrating subwoofers using SHD: Subwoofer Integration: Take Your Stereo to the Next Level

If you have a 2.1 or 2.2 setup, the SHD gives you two (high pass) digital outputs for your DAC and main speakers, plus two (low pass) analog outputs for your subwoofers.

Here is a block diagram of how the subwoofer would be integrated. Also see

Deer Creek Audio just introduced a new tech blog that describes Using REW along with miniDSP Device Console to verify Audio System performance. Check it out: Using miniDSP Device Console and REW to Verify Basic System Setup

Here is a link to the shear / non-logo Nilai 500 faceplates, these are authentic Hypex OEM: https://deercreekaudio.com/products/ols/products/hypex-faceplate

In general what you're trying to do is get into the gain sweet spots of all of the devices in series in your system. In this case if you're using a fixed output from the Bluesound into the miniDSP Flex Digital then you could use the volume on the flex to optimize the volume control range on...

Completing this verification process will properly configure your system and provide the basis to successfully apply Dirac Live room correction to your audio system: https://deercreekaudio.com/tech-blog/f/using-key-measurements-to-verify-basic-system-setup

It's good engineering practice to design any electronic device for any possible use, not necessarily the use you had in mind at the time. Here's a simple home AC wiring analogy. It's typical to use 14 gauge wire running from a 15 amp circuit breaker to an outlet (depending on distance). If you...

The Flex processes Dirac Live at 48 kHz-32 bits vs. 96 kHz-32 bits in the SHD - Here is our comparison guide , look at this and the feature set may drive your decision.