Micro cube Micro marty RSS390Ho substitute?

[screamersusa]

The Dayton rss390 is a 4 ohm speaker.
I need to run 8 ohm speakers. Lower power is ok.
Can you suggest some substitutes that will work in these?
I'm gluing up one cab already.
TIA

 

[Inductor]

You can get a substitute and calculate the alignment similar to the one you have.