Hi Taketwo,
Sorry about the late reply,
Your questions are really good.
The TS33 drivers are the same as the TS3, Super 3 and BPC. I have to make the corrections on the site. At one time Fostex was advertising the FE127Es as 5" when they are really 4.5". All the 3 series speakers use the same Fe127E.
The difference between the TS3 and the Super 3 is other than the wide front baffle is an increase in box volume. This increase in box volume plus the wide baffle lets the Super 3 go lower and have more bass. The added bass also gives the Super 3 a better and smoother balance.
The BPC is actually 2 Super 3s in one cabinet with drivers firing forward and rearward. This speaker is very versatile and can be wired in 4,8 and 16 ohms. 8 ohm using front driver only as monopole or 8 ohm biamped. This speaker has very good bass and output is enhanced with room gain too.
The TS33 is a double version of the TS3. I doubled the enclosure size of the TS3 and added an extra driver. The TS33 can be wired in 4 or 16 ohm. It can't be wired in 8 unless you close off the port and run the top driver and use the second driver as a passive radiator. Could be a fun experiment.
The BPC does have the most bass followed by the TS33. The BPC strongest advantage is its imaging and soundstage and all the wiring advantages, great bass output and a very smooth presentation. JLM is right, you need a lot of room for them to work. I like to place mine between 4 and 6 feet away from the back wall. They are also great in the near field and I can listen to them from 5 feet away. The wide baffle in this case works 2 ways. To enhance the sound of the driver and also to prevent cancellation between the front and rear driver.
The TS33 is the most dynamic. Theoretically it won't go lower, but has much more impact and bass output in the range that it runs. In listening it sounds like it does go lower because of all of the bass output. In 4 ohm it is very sensitive and in 16 about the same as a Super 3. The imaging is pinpoint and very precise. By adding the second driver and 3” ports versus 2” on the others the TS33 will have much more bass impact and give out more volume than the Super 3.
Many thanks JLM for your posts too.
Thanks,
Louis