Bass speakers for 113 liter /4 foot cube closed box

[trondareo]

I am helping a neighbour repair a three way speaker of danish design from the 1980s. The bass speakers do not work. They are are unmarked, with a cutout diameter of 23cm=9 inch The cabinet has internal volume of 113liter or 4 cubic feet.
I would appreciate tips on what spec's of speaker I should be looking for.
From testing frequencies I have established that the midtone drops of at 100Hz

 

[SpirosZ]

You need to figure out at least the efficiency of the mid & tweeter.

 

[trondareo]

Should I be looking for Vas of 4cubic feet?

Also I forgot to mention they are closed cabinets.

 

[trondareo]

The efficiency, i was thinking maybe going for very high efficiency I could attenuate them until I find a pleasing sound.

 

[Dissi]

I would appreciate tips on what spec's of speaker I should be looking for.

Look for drivers having Qts around 0.5 and Vas around 130 litres. Then you get the classic Q of 0.7 in the closed box.

http://profesional.beyma.com/pdf/10BR60V2E.pdf

 

[trondareo]

Great! Thanks Dissi.