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What driver to put in Rumble 115 cab?

#41
baj25 said:
Would one of you more knowledgeable guys mind checking something out for me?
I've been trying to use winisd and unibox, and have run the numbers that Eminence give for Delta 15LFA in med vented cab (driver l have and size of my cab). I get cone excursion past Xmax in both at 250W. Any thoughts why this might be, when the Eminence software says it is ok? I am new at this but usually pretty good at working things out, so to have two calculators giving consistent results that differ from manufacturer makes me want to double check before l start cutting ports. Thanks.
Click to expand...
Eminence specifies "Use a 40 Hz High Pass Filter" for the Med Vented Cabinet (p. 3 of pdf): last I checked, you could only sorta-simulate it with a parametric filter in WinISD (and playing with the Q of the filter - the smaller the value, the wider the bandwidth).
(No idea about how to simulate a hpf with the other program.)
But, as said above, it may still not be enough to bring the programs to agree exactly.
Aaand, of course, you may need a hpf in real life if you want to put big watts into the cab.
 
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#42
Thanks again for comments gents. I'm pretty sure the box data is correct, it's mostly just a volume figure iirc. I did note the 40Hz hpf requirement, the Eminence graph shows excursion as dotted line below 40Hz, l did select 40Hz filter in the program. It is not the low freq that worries me (4 string only), more there is over excursion between 60 and 95Hz, peaking about 75Hz. The graph is exactly same shape and peak freq as the Eminence graph, just shifted up to give about 2mm more excursion everywhere. Winisd and unibox give same graph.
 
#44
Wow, Real blast from the past.
Worked all summer and bought 2 of these cabinets.
Be about 1988/89 Sophomore year Highschool.
Joined with the Dual Bass 400 head as my real first rig.

I liked the classic styling and remember all the old
adds for these in the magazines.
I actually really wanted the Spectrum cabinet.

But the 1x15 came with the casters and stacked
similar to Marshall Cabinets.
Had cups on the top. Where the upper cabinet
Wheels Sat in. Very stable stack
So funny my heart was so set on the Spectrum.
But in the store the 2x15 had a great sound.
Since the 400 head had 2 amplifiers.

Most cabinets you had to buy the Castors extra.
But got a cover included if you did.
These included castors with no cover.

I remember the way my room smelled like vinyl
When I got home from school.
 
#45
my BXR115 made in USA has 2 DIY piezo tweeter which makes the cab sound great (I can say that as I had a second one w/o which sounded quite dark in comparison, so I sold that one). There is a specific thread about that, posted by me some 2 years ago, anyway since the cab seems genuine, I can say that there is 1 single port, as the picture posted. Also the second one that I sold had 1 port only
 
#46
McKind said:
my BXR115 made in USA has 2 DIY piezo tweeter which makes the cab sound great (I can say that as I had a second one w/o which sounded quite dark in comparison, so I sold that one). There is a specific thread about that, posted by me some 2 years ago, anyway since the cab seems genuine, I can say that there is 1 single port, as the picture posted. Also the second one that I sold had 1 port only
Click to expand...
I bet the piezos sounded really great :oops:
 

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