fEARFUL style headcase for SVT-410HLF?

[BrianBOBO]

Is this possible? Or will there be a problem with the horns crossover network after the woofer crossover network? Would it show any real world benefits?

[BassmanPaul]

Forgive me Brian but I can't decipher what you are asking.

Paul

[BrianBOBO]

Can a mid range driver in a small case with a crossover network (hp for mid and lp going out to my 410 cab) be added to my 410. Would this give me better mid range dispersion and less distorted lows similar to a fearful setup?

[AlexanderB]

AFAIK, there is originally no filtering of the 10" in that cab (but I might be wrong). A high performance LP filter can be used, though, but you need one for 4 Ohm usage.

I guess the only practical place to put a mid would be where the HF horn is today? Even if it will help dispersion somewhat, it is still aimed at your knees...

Or do you by "small case" mean a separate enclosure on top of the HLF?

/Alexander

[BrianBOBO]

Yeah, I was thinking of a separate enclosure for just the mid and crossover. It would be small and have the same concept as the one on the fEARFUL WIKI page.

[Bmorefoozler]

Originally Posted by AlexanderB

AFAIK, there is originally no filtering of the 10" in that cab (but I might be wrong). A high performance LP filter can be used, though, but you need one for 4 Ohm usage.

I guess the only practical place to put a mid would be where the HF horn is today? Even if it will help dispersion somewhat, it is still aimed at your knees...

Or do you by "small case" mean a separate enclosure on top of the HLF?

/Alexander

He meant a sep[erate enclosure with Mid and Horn in it, as well as a three way crossover with a LP out. He would sit this on top of the 410HLF.
I'm not sure of the ned result, but the initial problem I see is the 4 ohm woofer load requiring a different crossover, though maybe the 12126 CBG x-over would work.

I'll wait for someone smarter then I to confirm or deny if this is a good idea. I have thought about this, btui I can't say that I've tried anything like htis.

[billfitzmaurice]

Originally Posted by BrianBOBO

Can a mid range driver in a small case with a crossover network (hp for mid and lp going out to my 410 cab) be added to my 410.

Yes. It would be best to have the crossover no higher than the 1 wavelength CTC distance of the tens, which is about 1.2kHz.

Would this give me better mid range dispersion and less distorted lows similar to a fearful setup?

Using a 6.5 midrange dispersion would be roughly quadrupled. It wouldn't make the lows any better. The tweeter in the 410 would be rendered inoperative, though that would be best off in the Headcase box anyway if you still want one.

[BrianBOBO]

hey bill, would the lowpass filter going to the 410 interact with the hp filter of the horn in the 410 and cause any damage to my cab? I generally dont run my tweeter very high (sometimes off) so i'm planning on not missing it much

[billfitzmaurice]

Originally Posted by BrianBOBO

hey bill, would the lowpass filter going to the 410 interact with the hp filter of the horn in the 410 and cause any damage to my cab?

No.

[BrianBOBO]

Last question. Can I use the crossover design for the 1212/6 fEARFUL? Or should I use a different design?

[rpsands]

Well, they're both 4 ohms, so it'd probably be close enough for government work, especially given how low it is. But it definitely won't be ideal - since you'd want to use impedance curves for those drivers to design the crossover. No way you're getting those, however, so probably the 212/6 is about the best you're going to do since it's at least matched to the 6nd410.

[Passinwind]

Originally Posted by rpsands

Well, they're both 4 ohms, so it'd probably be close enough for government work, especially given how low it is. But it definitely won't be ideal - since you'd want to use impedance curves for those drivers to design the crossover. No way you're getting those

It's not all that hard to measure impedance curves yourself.

[billfitzmaurice]

I don't use Zobels (impedance flattener) myself, but if in doubt you could use one.

[rpsands]

Originally Posted by Passinwind

It's not all that hard to measure impedance curves yourself.

How would you go about doing this? My understanding was it'd require a pretty decent multimeter or something for reading the impedance was you sweep a signal or something along those lines.

[billfitzmaurice]

Originally Posted by rpsands

How would you go about doing this? .

With a DMM, sine wave generator and resistor bridge, and of course the knowledge of how to do it. Not something the casual builder would have the capability of doing.

[AlexanderB]

Reading voltage across resistors is pretty simple, but you need a true AC compatible multimeter, or all readings above 50-100Hz will be completely off.

Free tip: It is perhaps easier to use a tape recorder's VU meter or the soundcard's input at a computer to see the voltage across the resistors. 0.5dB resolution is quite common and should be OK for some DIY.

/Alexander

[Passinwind]

Originally Posted by rpsands

How would you go about doing this? My understanding was it'd require a pretty decent multimeter or something for reading the impedance was you sweep a signal or something along those lines.

Yep, at minimum what BFM said. Personally, I can't see any serious DIY speaker builder not owning and knowing how to use those tools though...not that my perception means much in the "real world."

Recently I have been using a simple DIY test jig attached to my soundcard, along with an old orphaned freeware speaker modeling/measurement app. Total PITA to set up, but really quick and easy for test measurements once you suss that. I just used a DMM and sig generator plus a few resistors for many years before that though.

[Wes Whitmore]

Here are a couple pictures I had of 2 different HLF(HLN)'s xover...

HLF




HLN