Mark Audio CHR-70 MLTL

Mark Audio CHR-70 or CHP-70 MLTL box

Use 25% infill. 

It needs Polyfill for first chamber.

It's amplifier slot is designed for Wuzhi Audio ZK-1001U TWS mono amp, Power socket needs to be drilled where ever user wants it. 

There are no speaker screw holes so you can use either wood screws or melt nuts to the frame and use bolts, screw size is M4. 

Speaker casket diameter is 124mm
Speaker hole diameter is 102mm

The sound quality depends on the element itself, box is somewhat universal for both. 

F3 is 65Hz so if you want really low bass, you need to add subwoofer as an extra. 

CHR-70 is sharper, more modern sounding and CHP-70 is warmer sounding. 

The top cap has cone for higher frequency reflections so it's not some “True Hi-Fi” box but I'll let you to decide that. 

No passive filters needed, just connect straight to the amp. 

Mark Audio costs about 45€ and the amp costs 16€. You need epoxy to glue pieces together.

It takes about 2kg of PLA per speaker.