This is my room plan – 6.1m x 3.6m (20′ x 12′) – showing the ‘compound’ Mid-Basshorn cabinets:
The driver was originally a Lowther PM4. (Very costly and high maintenance. Now, I am using the inexpensive Seas FA22RCZ.)
The final design of the Basshorn, with front Midhorn is below.
This Basshorn is designed for corner-loading:
- To reduce horn mouth size – by 1/8.
- For the most uniform low frequency in-room response.
- To minimise loss of room floor area – by internal folding sideways and corner-positioning.
- The horn mouth faces 2 directions – along both the front and side walls – and the floor.
- Horn length 4.05 – 4.10 metres
- Throat size 80 sq cm
- Mouth size 10,370 sq cm
- Flare rate M=1 (exponential)
- Driver throat chamber 14,500 sq cm excluding driver (can be reduced to 8,500 sq cm by inserting solid infill material)
- Design Fc 29-32Hz
Construction will use 18mm plywood – for high stiffness/weight ratio. Also for better sound (compared to MDF or Particle Board).
The mouth area will use 2 layers x 12mm plywood – for greater thickness and strength in this area.
Stiffening ‘battens’ are screw-fixed on the exterior back and sides, where required to dampen resonance.
All bends are smooth-curved, using ‘Bendy Plywood’ – 2 layers x 9mm thickness.