Sub DIY Planning RSS390HE-22 Subwoofer + Passive Radiator good idea? or better sealed.

[Erdbeere]

Hello,

I am planning to do my first Subwoofer Project and I think I need some advice

Dayton Audio RSS390HE-22 Subwoofer 15 inch​

Dayton Audio RSS460-PR 18 inch with 8x75g weight​

Planned is a 130 liter case 480 x 480 x 700 mm. 18mm MDF (Part express recommandation 127L)

2x 70 mm bars 2x each side to stiffen the long sides.

Passive Radiator on the Backside, same axis as the sub.

To me it doesn´t look that wierd. Actually I am running a SVS SB 2000 and think about trying it myself to build a good sub.

What do you think about that? Should I go sealed (60-65L) and adjust it to my desire with a DSP or go for Passive radiator and DSP and might have a harder time to adjust?

Usage is like 70% home cinema / 30 % Music.

Thanks in advance.

 

[smittyj01]

I didn’t build mine yet but I decided on 3.2 cuft (about 90 litres) in a sealed enclosure. https://www.diyaudio.com/community/threads/dayton-rss390he-22-vs-um-15.392230/#post-7178856

A number of years ago I built a Peerless 10" sub with a 10"passive radiator and loved the sound but it was much too smaller for my larger room.

 

[GM]

Hmm, since HT dominates, then ideally tune to at least 20 Hz and depending on any room/boundary gain even lower for the movies with < 20 Hz output plus a bit better for music or if you don't want THX reference output, then EQ'd ~0.5 - 6 Qt sealed is fine as it goes even lower and at a superior transient response for music.

If used to the driver's power limit, better to use dual opposed PRs.

 

[mordikai]

I did mine in a 5 cu ft tuned to 20hz with a good old pvc pipe. Sounds pretty good and digs deep. I can’t say I push it all that hard.

 

[Erdbeere]

Thank you for your feedback. I thought I take a look at full power xmax to make sure I don´t damage the driver. In my case around 95-100 db output at 25 Hz is enough. I won´t push it that hard.