Some plots courtesy of Bill Fitzmaurice:
Frequency response of typical 15"+tweeter crappy combo:
vs frequency response of a nice 15" + tweeter:
Note the huge difference between the cheap 15" and the nice 15". Go without a tweeter and you don't have the problem of the gap in response between woofer and tweeter, so great for old school sounds or less bright sounds. Use a midrange speaker instead of a tweeter and you get a great fullrange sound with no gaps in response.
Alex
Hey Alex,
The Berg115 (and the HT210 and HT210s) are unique sounding to me. They use an unusual (at least in my experience) combination of a hi xmax driver (resulting in GREAT low end extension, but a relatively low dropoff in the mids), and then, instead of using a mid driver to fill that upper mid dip, and a small tweeter crossed over very high (like the Acme cabs), Jim uses a HUGE PA type horn crossed over quite low.
So, the good news is, with these older HT's, you get HUGE low end, and a very even, smooth response from the mid mids all the way to the high treble.
The bad news is, IMO, your upper mid response is totally confounded with the treble response (i.e., as you adjust the attenuator to control treble, you also impact the upper mids), and the result of so much sound coming out of that big, metal horn is (again IMO) a very hi fi, and to my ear, somewhat 'clinical' upper frequency response.
That being said, if you are looking for wide, clean, deep and relatively hi fi, these older Berg's are pretty cool.
I prefer a three way design myself for this sort of 'wide, even' hi fi' type voicing (I like the sound of a paper cone mid driver a lot more than upper mids coming from a horn), but it's a unique execution of 'full range', and for certain contexts, I still dig my 's' stack.