Shigaraki and other simplistic gear

Elevick:

The Jordan JX-92s drivers do not require a helper tweeter, IMO.

Measured "by my ears" they seemed to have as much usable HF info as the little 3" Fostex driver (think it was an FE83)

The following link contains measurements.

http://www.ejjordan.co.uk/drive_frameset2.htm

My Stephens 8" 80FR drivers meet your description "roll off considerably above 15khz" and in comparison the Jordans sound more like my 8" coaxial drivers which have usable response to around 20K HZ due to their center mounted tweeters.

There is also an impedance graph @ the Jordan site that looks pretty good (fairly steady over a wide range) which perhaps explains why they work with 25 watt amplifiers (even though they are of low/moderate sensitivity).

Ed:

Is that (the impedance) a problem for the 47 Labs chip amp?

Changing it does alter the sound (my Bottlehead amps have 4 and 8 ohm transformer taps, plus some of my vintage amps have 4, 8 and 16 ohm taps), but if you are already in the synergistic ballpark then adjusting the impedance one way or the other offers no benefit.

Is this what the auto formers do, or is their more to them?

Ask Yoshi, @ 47 Labs USA/Sakura, about your amps characteristics VS the speaker load. Chances are that he may have an opinion based on using various speakers with the amplifier.

Bemopti:

Which Fostex drivers will you be using (208S), also what type of enclosure?

Bemopti:

The 208's in horn loaded enclosures should be nice, plus easy to drive.

It's not the age that counts, just the lame factor.

"What a drag it is, to be/getting, old."

I'd try the Assemblage to check power requirements and then go from there.

If it's not enough power then forget SET (unless you can spend some big bucks). If the power seems right but you desire more 3D/detail then look into a better 300B SET amp.

Bemopti:

The key to a decent SET based system is using speakers of high sensitivity. An easy load (smooth impedance curve) would also seem to help make the most out of the available power.

If the 208's are an easy load and around 97 dB then they should be fine with the 300B amp in a small/medium sized room.

With my current rig (details including room size are listed) I do not experience compression, but then I also do not listen @ high SPL's. Though the setup does not do low bass it still manages to nicely portray dynamic swings in the music. Can't afford decent subs and would rather do without than screw up what's already good about the sound.

My previous setup (Audion 300B SET/Reynaud Twins) did compress a bit with certain complex material (fine with simpler music). It was better suited for a spare (11 x 14 x 8) bedroom, but we prefer to listen in the living room.

Other than the occasional crescendo, or rim shot if seated too close to the stage, I never experienced many "slams" in 30, or so, years spent listening to live music (no longer do so). Because of this I tend to stop taking a gear/music conversation seriously @ the point that this word is used to judge a musical system.

Even "The Who" never slammed me live. They may have been nauseatingly loud, but they never slammed me.