You could convert it to a sealed box. Most sealed alignments are approx half the volume of a bass reflex alignments when looking at maximum flat response. Just get the free version of WIN ISD and play around with various woofers to get a feel for it. You will loose some bass extension but can compensate by putting them closer to the wall or using the good ol' tone controls. You can't really go too wrong with sealed from a tuning point of view. Stuffing the box with acoustic material will increase the effective volume and reduce unwanted resonances.
You could re-consider Pete McK's offer and supply him with the measurements he requested. 😉
However, if you prefer a "cobbled together" job, make an MDF test box that has the same internal volume as the bookshelf model.
Mount your mid/bass driver in the box on its own.
Make a hole into which you can slide 75mm (3") plastic pipe.
Cut the plastic pipe up into sections of the following lengths: 300; 250; 200; 150; 100mm.
Play some music with good bass content and find out which length of tube gives the most satisfactory bass reproduction to your ears.
P.S. Well seasoned hardwoods are used in loudspeaker cabinet making by expert woodworkers and look and sound fabulous. Real wood veneer on MDF (both sides) works well as it has good acoustical properties. It's really a matter of personal choice and expertise which you choose.
P.P.S. Grill on to protect drivers, grill off for serious listening.
EDIT: I've just seen Stal's post and his ideas are in accord with the suggestion I made earlier of making a mockup sealed box to judge the bass response without a vent. 😎
However, if you prefer a "cobbled together" job, make an MDF test box that has the same internal volume as the bookshelf model.
Mount your mid/bass driver in the box on its own.
Make a hole into which you can slide 75mm (3") plastic pipe.
Cut the plastic pipe up into sections of the following lengths: 300; 250; 200; 150; 100mm.
Play some music with good bass content and find out which length of tube gives the most satisfactory bass reproduction to your ears.
P.S. Well seasoned hardwoods are used in loudspeaker cabinet making by expert woodworkers and look and sound fabulous. Real wood veneer on MDF (both sides) works well as it has good acoustical properties. It's really a matter of personal choice and expertise which you choose.
P.P.S. Grill on to protect drivers, grill off for serious listening.
EDIT: I've just seen Stal's post and his ideas are in accord with the suggestion I made earlier of making a mockup sealed box to judge the bass response without a vent. 😎