- NAD M22 Special Edition -
I am coming at this as a happy diy hobbyist and have a question for anyone who want take on the challenge but feel obligated to mention a few things before we get to the core of the thread.
I am by no means smarter or understand electronics better than the people at NAD or Hypex and just want to say thanks to all the engineers who worked on this project. As I say that I realize that there probably was some compromises done and the over all project goal had financial limitations in order to wrap the product in a package that did not risked costing to much. For me, things are a bit different since I basically will only pay for the components and not the brand or other engineers salary, neither do I consider myself to be wealthy but am able to invest that which is required. So with that out of the way, lets look at what the goals are.
Now for the core of the thread. The original M22 does not have internal bridge mode options but can be bridged using an external XLR Bridging Y‐Adaptor and using the left + terminal and right + terminal, all of this is external means to run the M22 in bridge mode.
The M22V2 comes along and offer internal bridge mode which also is using + terminals only - see image
Moving forward my question is directed towards how to solve the x2 M22 constant bridge-mode configuration. Should I simply go for an internal wiring which mimic that of the external XLR Y-adapter and also connect the left and right positive lead to the output terminals - which would be labeled positive and negative on the outside of the amplifier ? This causes the least hassle and issues in regards to keeping the circuit as is.
M22V2 has a 20% increase in power delivery from the PSU, this could be as simple increasing the size of the capacitor bank for increased power headroom.
- Oneminde
I am coming at this as a happy diy hobbyist and have a question for anyone who want take on the challenge but feel obligated to mention a few things before we get to the core of the thread.
- Disclaimer -
This is by no means going to be a commercial endeavor, its a one mans personal journey in building an awesome class D amplifier. I do not own any rights to any idea presented or forwarded in this project and or htguide.com thread created around this project. I understand that what is presented and asked in this thread is not suited for everyone which is fine. If you don't like the idea or general approach you are free to leave and do your own thing. While replication for personal use is frowned upon it is not considered illegal as long as it is for non-commercial use and without the intent to make money on it. - End of disclaimer.
This is by no means going to be a commercial endeavor, its a one mans personal journey in building an awesome class D amplifier. I do not own any rights to any idea presented or forwarded in this project and or htguide.com thread created around this project. I understand that what is presented and asked in this thread is not suited for everyone which is fine. If you don't like the idea or general approach you are free to leave and do your own thing. While replication for personal use is frowned upon it is not considered illegal as long as it is for non-commercial use and without the intent to make money on it. - End of disclaimer.
- The primary goal of this project is to take the original NAD M22 (Hypex NC400) and make it live as a permanent bridge-mode amplifier x 2. Effectively using 2 x M22 as a stereo amplifier in one chassi, returning a whopping 2 x 900W (1 kHz 8 ohms 0.1 % THD).
- The PSU gets a separate chassis to get rid of AC noise and make room for the doubling of components.
- A side mission is to look over all components used and improve / replace when and if needed. Such replacement can simply to to get rid of electrolytic capacitors and use Metalized Polypropylene Capacitors or Foil Polypropylene Capacitors, Thin Film 1206 resistor etc
Now for the core of the thread. The original M22 does not have internal bridge mode options but can be bridged using an external XLR Bridging Y‐Adaptor and using the left + terminal and right + terminal, all of this is external means to run the M22 in bridge mode.
Connect the Positive Speaker Lead coming from your Right Speaker to the Right Channel Positive (Red) Speaker Output. Next, connect the Negative Speaker Lead coming from your speaker to the Left Channel Positive Speaker Output of the amp as shown in the picture above. The Negative (Black) speaker output must not be used in a bridged mode.
Moving forward my question is directed towards how to solve the x2 M22 constant bridge-mode configuration. Should I simply go for an internal wiring which mimic that of the external XLR Y-adapter and also connect the left and right positive lead to the output terminals - which would be labeled positive and negative on the outside of the amplifier ? This causes the least hassle and issues in regards to keeping the circuit as is.
M22V2 has a 20% increase in power delivery from the PSU, this could be as simple increasing the size of the capacitor bank for increased power headroom.
- Oneminde
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