B200 in BIB?

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#2
I actually tried the B200 in an undersized BIB (12"x18"x72") years ago. Tremendous, if not overwhelming, bass punch. Would work great as efficient non-fussy tv speakers powered by the tv's internal amp and surround circuitry. As now the hdtv broadcasts warrant quality speakers. For music it will occasionally produce an odd sounding resonance, but that is happens in all for these big gain rear loaded cabinets.

The B200 is underrated. One of the few versatile single driver speakers that is balanced enough not to need help on top or bottom. If you your room cannot tolerate a big BIB or strictly for music, I would use the B200 in an aperiodic much smaller cabinet.
 
#5
Zilla, did not "double up" front or rear, but used cross sectioned bracing. I did another RCA-Fan horn and it too would produce an odd resonance every so often at some frequency. I heard this too at the Fostex room at the CES in their large rear loaded horn (I think made by Madisound). I attribute this to an artifact of big gain rear loaded horns. The resonance is not audible to everyone or at least they are not aware of it. And/or I may not be describing it accurately. When I brought the resonance to the attention of a another listener they described it as "wooly" or that particular frequency was simply louder. I think the resonance is definitely more audible on these large gain rear horns as the horns are producing a greater bandwidth of amplification which is inherently harder to keep even especially when you factor in room gain or suckouts. But, yes by making a more massive cabinet you would remove it as the culprit.

freddi, not "hit in the chest" bass. Lower more throbbing, rattling the windows type of bass. Yet, not quite subsonic, probably around 40 to 50Hz though I did not measure it. (Your Karlson has more "hit.")

In my particular BIB, admittedly not designed for the B200, I think the addition of another smaller full range would balance out the sound. Doing so of course would require some trial and error, but the resultant efficiency is alluring.
 
#8
is there partial confusion in this tread between the little Visaton 8" fullrange and KEF's classic oval woofer? BIB depending upon aspect will trade off the upper bass gain vs same bulk horn/pipehorn with cutoff set 1/2 octave higher. Simulations of BIB don't show much power handling with typical fullrange xmax. I've on backorder a Peavey IPR 3000 - might change that to 6000 with 1KW/channel/8ohm to kick Karlson with dynamics - but 500+W @8/channel is probably enough for midbass
 
#10
b200 versions
 

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#15
AndrewT said:
the Qt values vary from 0.23 to 0.51
Some must be more suitable than others.
Click to expand...

Depends on what you mean by 'more suitable'.

For a given horn Fp and all other driver specs equal, then the lower its Qes, the wider its LF rising response (point source) BW, ergo the longer its axial path-length, the smaller its filter chamber, throat and mouth area, so at a glance one would assume that the lowest Qes driver is the 'no-brainer' choice.

The reality though is that the longer the horn, the greater its delay WRT the driver's output, so depending on who you ask, the horn's HF corner frequency needs to be between ~250 - 400 Hz before their comb filtering begins to audibly 'smear' its sound-staging, imaging (loss of clarity).

Since only Fs, Qes is required to define this acoustic XO point (2*Fs/Qes), then assuming all these have a ~25 Hz Fs, the driver's Qes range is ~0.408 - 0.255 respectively after all series resistance has been accounted for.

GM
 
#17
with "B200" seems to me Andrew is thinking of KEF while the original poster wants a BIB for Visaton's 20cm fullrange. GM could help on BIB or tapped horn for KEF B200 - latter might need inverse taper pipe due to low fs - unless set for 16Hz. AJ-Horn works fine for BIB but won't do tapped. Gilles did a K(arlson) for B200 (Visaton) I had KEF B200 in ESS Transtatic.
 
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