Arpeggiator
A fullrange speaker prototype. That sharp angle was a mistake; internally the front bottom joint is more squarish,
with a bass trap in front of the wedge corner.
* Fullrange drivers aren't necessarily "midrangey". They can be very sensitive to damping and enclosure geometry/damping (an enclosure without damping can produce harshness). In a good, dampened enclosure above compliance volume and without excessive driver damping, fullrange drivers can sing. Some drivers (Visaton FRS8M) are very sensitive to back damping and even damping of the panel they're mounted on. As an example, copper tape damping the mounting panel added harshness, Dynamat or Blu-tack damping of the driver kills high-frequency response.
* The other common problem with fullrange drivers is awful capacitors/slow opamps in the amp/preamp. These can kill space/treble. Stick with Nichicon electrolytics, teflon, silver mica, polypropylene and dry tantalium where possible. Opamps must be at least 20 V/microsecond speed.
* Waveguides are a must for rullrange drivers, otherwise treble response will be messed up. Usually stock manufacturer grilles include waveguides.
* Fullrange drivers are generally more efficient than a 2-way crossover setup. This is because in a crossover, almost half the power is burned on tweeter filter's resistors.
* Ported speakers ought to have at least 1/3 the driver diameter port radius.
* Port shape can be anything, even a bunch of small holes, as long as it fulfils the volume/depth requirements of Helmholtz resonance. If anything, the issue is smooth air flow (flanged pipes work better at higher volume).
* Spike (or even screw) legs improve airiness/dimension and provide some extra musicality as long as the cabinet is designed for consonance/resonance (that is, it's a wooden cabinet).
* Avoid sharp angles. They act as standing wave generators, increasing air springiness and firing back into drivers, messing them up in a harsh way. If there are any sharp angles in a speaker, cover them with bass traps.
* Avoid plastic paint. It kills resonance.
* Avoid plastic. In paint, decorations, anything that can interfere with natural wood tone.
* Avoid 4-ohm drivers. They're less stable in high frequencies and tend to overheat amplifiers, especially those not designed for 4-ohm drivers. 8-ohm are stable and have better compatibility.