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fEARful™ Part Ten (10)

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#621
Arjank said:
The 3015LF does not have a higher(or lower) efficiency then most 15's. Btw. the effiency, in the bass range that is, for a woofer is mostly determined by it's cone size. The magnet strenght and the cone weight have just a slight influence on that (a heavier cone will mostly have a higher efficiency down low then a light weight cone, hence the light weight cone will have more efficieny on the upper range). What I state is very simplified though, there are way more parameters that determine it's efficiency.
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I pretty much agree with this, but if Im not mistaken, isnt it the stiffness of the cone-regardless of the weight-that determines where and how much efficiency you get?
 
#623
knuckle_head said:
Passinwind - any luck implementing the miniDSP? I'm looking at this in lieu of a VSX 26, though I'm disappointed that I'll not have a RTA without the Peavey.
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Skip, the MiniDSP guys have recently integrated their hardware with the Room EQ Wizard RTA software, which is freeware. I haven't tried the combo out yet, but I will definitely give it a shot soon. I've been getting some pretty promising results with the MiniDSP hardware with their latest plug-in revs -- hoping to get back to testing later this week.
 
#624
Ol'Bass'ead said:
I pretty much agree with this, but if Im not mistaken, isnt it the stiffness of the cone-regardless of the weight-that determines where and how much efficiency you get?
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The stiffness or the cone has nothing to do with the efficiency (well, a sloppy cone will not generate much sound:D)
Or do you mean the suspension stiffness? This determines, together with the cone weight, the resonance frequency of the driver.
 
#625
Passinwind said:
Skip, the MiniDSP guys have recently integrated their hardware with the Room EQ Wizard RTA software, which is freeware. I haven't tried the combo out yet, but I will definitely give it a shot soon. I've been getting some pretty promising results with the MiniDSP hardware with their latest plug-in revs -- hoping to get back to testing later this week.
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+1 for REW. It is very simple to use and gets very accurate results. I've used it for acoustic analyses of listening room and recording studios and the waterfall plots and RT60 plots are excellent.

Robby
 
#626
This is a really nice diagram from Sundogue - however, I'm also putting in a tweeter with L-pad - anyone have a diagram on wiring these in?

Thanks!

Sundogue said:
This might be of help to those who buy the pre-built crossover from Leland at speakerhardware. It was a little confusing to me (being a newb myself with the electronic end of cab builds), so some others might benefit from this...

And here is a quick wiring schematic (sorry, I'm not the best at wiring diagrams)...

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#627
greenboy_Tweet.png


"from Connector Cup just like other crossovers" ...essentially that means you can branch off the main + and - connections anywhere between the Speakons right up to where they connect to the other crossover board.
 
#628
Robby Hoinsky said:
+1 for REW. It is very simple to use and gets very accurate results. I've used it for acoustic analyses of listening room and recording studios and the waterfall plots and RT60 plots are excellent.

Robby
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Thanks Robby. That gives me a little more incentive to set my audio analysis/recording computer back up! ;)
 
#629
greenboy said:
Passinwind,

Seems to me one of the best uses for MiniDSP for neophytes here in bassland would be getting access to adjustable highpass filtering. People seem to associate this HPF thing with fEARfuls for some reason. But really it's less hirsute enclosures that'll benefit the most, since tunings are often a little too high and driver excursions kind of low.
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The MiniDSP widget is exceptionally well suited to that task, for sure. I wrote a few compound filters as my very first test case, and since you can monitor results in real time it's pretty easy to dial in just what you want.

I agree, fEarfuls actually are much more forgiving of EQ abuse and such than most cab designs, but a well designed high pass filter can still extend that advantage a bit more, eh?
 
#631
Passinwind said:
I agree, fEarfuls actually are much more forgiving of EQ abuse and such than most cab designs, but well a designed high pass filter can still extend that advantage a bit more, eh?
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Sure, yuhbetcha. As you enter into more demanding high-power use it becomes pretty much the same case as more conventional bass cabs.

Beyond the driver protection issue, non-intrusive HPF is also a way to get more focused tone without any sacrifice in audible lows.
 
#632
As short and sweet as I can make it... the plan calls for styrofoam box "inside" the mid box. Is this instead of or in addition to the poly-fill that is recommended elsewhere?

Thanks guys, I'm getting really really close...

And thank you Leland for all the trouble you have gone through getting me pieces parts; I do appreciate it!
 
#633
greenboy said:
BurningSkies,

From the look of Google shopping, the larger Peavey IPR and IPR DSP models are either beginning to flow or will, very soon.
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Thanks, man!

Funny you mention it, I have a 3K arriving supposedly in the next half hour from UPS...Cooler heads prevailed...er...or sort of prevailed...and I decided to try the 3K. Its available now, and for $399 with no tax and no shipping. If I decide it's waaaay overkill, I'll keep it as a PA use only amp. If its underkill (which is probably not going to happen), I'll sell it and bump up. If the DSP versions end up being all that, I'll consider that at a later point too. I figure its a win-win-win situation. I'll let you know how it goes.
 
#635
Had a look at the manual of the TC Electronic RH750 today. More power for fEArfuls, and in addition to fixing a couple things I thought were bad decisions (non defeatable lowpass filter that dulled tweeters) they've maintained the easy settings of their tri-band compression, and the quasi parametric EQ. This really ties in with the DSP theme.
 
#637
Greyfin10 said:
So, if I'm using the ASD 1001 I'm good to go without the styrofoam then? I'll can always rip it out and redo if I'm interpreting it wrong :)
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It's got nothing to do with HF compression drivers and waveguides or lack therof. In a couple cabs it gets used with 18 Sound mid drivers to adjust midchamber interior size downward - but not with Alpha/Alphalite ones.
 
#639
IPR 3000 in the house. UPS hit their usual schedule (delivered by 7pm) by showing up at 7.20...which is better than they usually do, when they don't bother to show up at all and list me as not home. ;)

Interesting...the amp weighs something similar to my LMII, but obviously in a slightly larger form factor. In the box is a cord, a printed safety sheet, a printed one page spec sheet and a CD with the PDF manual of the IPR 1600.

I dig that the packaging contains no styro, but instead some very thin (and presumably recyclable) spacers. I'm waiting for a call to pick up the African, then I'm off to the room to try it out with the fEARfuls and the Kern.
 
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