I ordered one SI HT 18 two weeks ago, now just ordered another, so I can have a matching pair, hehehe...
The sub will need to fit under a shelf, in between brackets, so height is restricted (74cm) and so is width (58cm)
Shelf depth is 60cm, but I could go more if needed...
Currently I have it at 57x73x60cm (WHD) outer dimensions.
I will be using 22mm MDF for this build, double 22mm baffle, slot ported, as you can see...
I used the Precision Port website to calculate port length for round ports, but need some help with this slot port design...
When finished, I will have it sprayed with Speedliner (bedliner used for automotive and industrial purposes)
Questions:
- what frequency do I tune it to ? 20Hz ? Fs17Hz ? Lower ?
- what would be the port length ?
- How do I measure port velocity to avoid chuffing ? Without flares etc...
- also, do I need more volume ? Currently it's about 7cuft sans port.... do I need more ?
Thanks guys !!

The sub will need to fit under a shelf, in between brackets, so height is restricted (74cm) and so is width (58cm)
Shelf depth is 60cm, but I could go more if needed...
Currently I have it at 57x73x60cm (WHD) outer dimensions.
I will be using 22mm MDF for this build, double 22mm baffle, slot ported, as you can see...
I used the Precision Port website to calculate port length for round ports, but need some help with this slot port design...
When finished, I will have it sprayed with Speedliner (bedliner used for automotive and industrial purposes)
Questions:
- what frequency do I tune it to ? 20Hz ? Fs17Hz ? Lower ?
- what would be the port length ?
- How do I measure port velocity to avoid chuffing ? Without flares etc...
- also, do I need more volume ? Currently it's about 7cuft sans port.... do I need more ?
Thanks guys !!