Me and a friend started out with two large pine boards, and three hours later we had two working dipole speaker prototypes. The fastest speakers I've ever build!
We wanted to have a speaker that is true dipole, without using two tweeters like the Linkwitz Orion. The Beyma TPL-150 with the rear chamber and damper pad removed proved to be perfect! It extends more or less flat to 1.5 kHz. Removing the damper pad (which is glued to the rear side of the driver) produced a 5-6 dB peak around 9 kHz, but that was easy to get rid of with parametric EQ.
The midrange is the same Seas W22EX001 used in the Linkwitz Orion.
For the bottom octaves we are going to use a new 21" from Beyma, which has not yet arrived. This woofer named 21SW1600nd was presented at Prolight and Sound in Frankfurt a month or so ago, and production drivers are expected around the end of May. While we wait, a Beyma 18G50 acts as stand-in. The longthrow 21" will produce at least 6 dB more SPL than the 18G50. Not that the 18" is anyway close to bad... there is plenty of bass down to approx 30 Hz.
XO and EQ is run digitally in my computer. There's a long thread on this forum about that: "A how to for a PC XO". XO frequencies are 150 and 1500 Hz, 4th order slope.
We wanted to have a speaker that is true dipole, without using two tweeters like the Linkwitz Orion. The Beyma TPL-150 with the rear chamber and damper pad removed proved to be perfect! It extends more or less flat to 1.5 kHz. Removing the damper pad (which is glued to the rear side of the driver) produced a 5-6 dB peak around 9 kHz, but that was easy to get rid of with parametric EQ.
The midrange is the same Seas W22EX001 used in the Linkwitz Orion.
For the bottom octaves we are going to use a new 21" from Beyma, which has not yet arrived. This woofer named 21SW1600nd was presented at Prolight and Sound in Frankfurt a month or so ago, and production drivers are expected around the end of May. While we wait, a Beyma 18G50 acts as stand-in. The longthrow 21" will produce at least 6 dB more SPL than the 18G50. Not that the 18" is anyway close to bad... there is plenty of bass down to approx 30 Hz.
XO and EQ is run digitally in my computer. There's a long thread on this forum about that: "A how to for a PC XO". XO frequencies are 150 and 1500 Hz, 4th order slope.