How to DIY yourself very nice Class D monoblocks

Thanks, george and erik.
Let's say you wanted to build two mono amps with NC400 modules, but you wanted to put two NC400 modules in each mono chassis so one would drive the bass panel and the other would drive the midrange/tweeter.  Is it possible to split the input at the mono amp so the signal goes to both NC400 modules?  Are there any possible downsides in doing so?

Hi @ketchup
Not really, but the impedance would drop to 4k.

Most solid state pre amps would have no issues with this at all, but some tube may.

However, maybe what you really want to do is active biamp? Hypex sells active crossover modules as well.

Best,
E

I’m not really interested in active biamping yet. I just learned that the NC400 modules are bridgeable, so it’s possible to use two modules per channel and have double the power. Would the input impedance of two bridged modules also have an input impedance of 4k ohms?

Sorry @Ketchup, I can't imagine the need for bridging those amps, but I do see you increasing your complexity dramatically.

I'm not sure what the impedance would be, but you can find it from their data sheets. 
I'd like to strongly suggest to you that you get a stereo pair, and see if you feel there's any need at all to do more.

Best,

E

  ketchup,

      I know you can purchase completed kit amps that contain two HypexNC400 class D modules in each mono block from James Romeyn Music andAudio, LLC in Utah.  I believe his dual mono versions cost about $3K/pair and are powered by the largest Hypex NC1200 switch mode power supply.   
     I've never auditioned the dual monos but he claims the dual mono versions sound better than the regular monos. 
      Several years ago, I talked to James Romeyn at length about having him build a custom pair of mono blocks for me using a single class D Abletec ALC1000-1300 module per case. Abletec has since been purchased by Anaview,another Scandinavian class D module producer and competitor to Hypex and other producers.  Anaview and Pascal class D modules have alternative designs that incorporate power supplies into their modules rather than as separate parts/boards.
     James was very knowledgeable about class D in general and took the time with me in explaining the specific differences between building amps using his Hypex and Ice based modules and other competing modules.
     I think he'll likely be equally helpful in answering your questions.  Here's a link to his website:
http://jamesromeyn.com/product/hypex-professional-build-service/#tab-description
     
Tim