Hypex Nilai DIY500 Stereo Modifications

<span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”> My first modification was installing a second PSU into my Hypex Nilai DIY500 Stereo amp to double the power output into 4 ohms.</span><br style=”box-sizing: border-box; margin-top: 0px; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>I disassembled the amp, drilled 14 new PSU mounting holes and five large holes to fit some metal Temu air vents. The additional PSU is supplied with two amplifier connection cables (not required), a power input cable and a 12 pin auxiliaries cable (J5).</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>I soldered the power input cable to daisy chain it with the original power input cable.</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>I also soldered five wires on the 12 pin auxiliaries cable to the original 12 pin cable. This required carefully removing some of the insulation from the original cable, soldering the ends of the new cable onto the original and then insulating with electrical tape. The five wires I connected were:</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>Pin 2: Ground</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>Pin 7: Pushbutton+</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>Pin 8: Pushbutton-</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>Pin 9: Trigger+/-</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>Pin 10: Trigger +/-</span><br style=”box-sizing: border-box; color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;” /><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>The end result sounds slightly better than with a single PSU IMO. The extra headroom seems to have given the bass more weight behind it and added to the overall clarity at louder volume.


My second modification was </span><span style=”color: #1b1e23; font-family: -apple-system, BlinkMacSystemFont, ‘Segoe UI’, Roboto, Helvetica, Arial, sans-serif, ‘Apple Color Emoji’, ‘Segoe UI Emoji’, ‘Segoe UI Symbol’; font-size: 15px;”>adding a gain switch (on-off-on 6 pin) to the rear panel. Seems to work and can be easily reversed if it has any negative effect on the sound.

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