L CAO in OB W/ Eminence Woofer

[Nelson Pass]

The L Cao thread was moved to the commercial area, however I
promised some more data, and if you are like me, you'll never see
this over there....

This is a NF / FF composite of the L Cao 8" with an Eminence Beta 15
in an open baffle with 6 dB of EQ at 20 Hz and -3 dB broad notch
at 3 KHz. The individual responses of the drivers with the crossover
are shown in dotted lines.

Any questions?

[GRollins]

Yep...I've got one.
When you say 6dB of EQ, do you mean an HP with Q ~ 2 at 20 Hz or an LP filter w/6dB oct rolloff at 20Hz?
(Huh! And you thought I wasn't paying attention...)

Grey

[freddi]

nice tight window - how is it say 15 degrees off axis in listening? I guess biamped it doesn't "gargle" much - hows the combo play on massed chorus, cello, bowed bass and percussion? - how about big band? - is it cool for opera? (sorry to ask so much) - are your filters pretty simple?

[one1speed]

That looks looks pretty good to me.

How do you like the Beta, vs the Alpha? I take it you have a 6db boost at 20 hz on the EQ, if I'm understanding?

Looks like a good combo from your graph.

[ttan98]

Nelson,

You have contructed many OB speakers based on FR and woofer combo.

Can you briefly describe to use how does this combo sound compared to the combos you have built so far?

Is L-Cao FR worth the money?

thanks.

[Nelson Pass]

Originally posted by GRollins
When you say 6dB of EQ, do you mean an HP with Q ~ 2 at 20 Hz or an LP filter w/6dB oct rolloff at 20Hz?

The former.

[Nelson Pass]

Originally posted by freddi
nice tight window - how is it say 15 degrees off axis in listening? I guess biamped it doesn't "gargle" much - hows the combo play on massed chorus, cello, bowed bass and percussion? - how about big band? - is it cool for opera? (sorry to ask so much) - are your filters pretty simple?

Good,

No Pan-Galactic Gargle Blasting,

Acceptable, Acceptable,

and simple.

[Nelson Pass]

Originally posted by one1speed
How do you like the Beta, vs the Alpha? I take it you have a 6db boost at 20 hz on the EQ, if I'm understanding?

The Beta comes with a magnet.

Yes 6 dB at 20 Hz. See Grey above.

[Nelson Pass]

Originally posted by ttan98
Is L-Cao FR worth the money?

At $110, yes I think so. It falls roughly in the category of Fostex and
Audio Nirvana, and is comparable. All FR drivers have a couple of warts
here and there, and this is not an exception.

Probably the main attraction is lack of a whizzer, which seems to
be disliked by some. I am agnostic on that subject, but the L CAO
does get some decent top end without one.

By the way, the crossover filters are 12 dB/oct, set around 70 Hz on
the Low Pass, 150 Hz on the High Pass and are in phase.

The FR driver is mounted at a 36" height, and the baffle is held up
at about 10 degrees tilt by two 2' high by 1' deep rear side panels.

I do think it makes for a very pleasant system.

And here's the impedance curve of the FR in the baffle:

[ttan98]

One further question, you have tested many Fostex drivers ranging from FE167E(I have one) to more expensive one like FE168EZ(If I am not mistaken).

Does it come close(in terms of sound reproduction) to which model of Fostex?

Thanks