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Hey guys...we need a little rallying here... - Page 241

post #7201 of 9844
Quote:
Originally Posted by Erich H View Post

One of the forum members will assemble the crossovers if you need them done.



biggrin.gif
post #7202 of 9844
You really should consider incorporating that new business! biggrin.gifbiggrin.gif
post #7203 of 9844
Thread Starter 
"Now that I am infected - what to build next ??"

it's kind of tough to see what you might have going for subs in your theater room. are you all set on that front?
post #7204 of 9844
I can assemble crossovers for locals(Long Island).
post #7205 of 9844
Quote:
Originally Posted by Erich H View Post

There were a lot of the Aurasounds left at Madisound and PE. I was keeping them in my cart to see when they got under a certain number so I could order a decent amount for the kits that used them. But I guess both stores sold out around the same time. Maybe a company bought all of them, I don't know.

It stinks because I had boxes cut for a design that Paul Carmody made up, and also some Stentorian baffles.....and the Big Mal baffles.

But all is not lost. There could be an even better woofer to replace it. The cut out for the Aurasound was only 6.16" because it really wasn't a 'true' 6" woofer. I looked hard to find a nice woofer that is suppose to fit in the same cut out and by luck one of the easiest woofers to design around happens to fit. Or at least the specs say it will. I'll know tomorrow if it will drop into the same recess.

Granted it's not $9, but still a very good woofer, and actually looks perfect for the job:

http://www.parts-express.com/pe/showdetl.cfm?partnumber=264-850

Any update on these Erich? Will the current Big Mal x over still work with these or will a new one be necessary? I would like to build a Big Mal with these.
post #7206 of 9844
Quote:
Originally Posted by Face2 View Post

I can assemble crossovers for locals(Long Island).

I am a bit of a drive but am talking to a girl out there. What part of li
post #7207 of 9844
Quote:
Originally Posted by goonstopher View Post

I am a bit of a drive but am talking to a girl out there. What part of li
PM sent.
post #7208 of 9844
That's called insulation, not shielding
Quote:
Originally Posted by bdemarco View Post

By shielded I mean like the wrap that is around copper, like the beige and the black wires in the above photo. I assume those are shielded copper. Am I saying it wrong?
post #7209 of 9844
I have a question regarding Bi-amping and the SEOS kit, in particular the Alpha Zephyr. If I separate the crossover board into High and Low, put two sets of binding posts on back would this necessitate a change in the crossover?
post #7210 of 9844
Quote:
Originally Posted by ScooterX View Post

I have a question regarding Bi-amping and the SEOS kit, in particular the Alpha Zephyr. If I separate the crossover board into High and Low, put two sets of binding posts on back would this necessitate a change in the crossover?
That's not bi-amping, which uses no passive crossover. That's bi-wiring, which doesn't do anything other than waste wire.
post #7211 of 9844
Thanks for the clarification Bill. Though I was going to use four amplifier channels, using the existing passive crossover or at least that is a thought bouncing around my head. It's entirely possible that while I am waiting for this kit that I am over-thinking some things and missing others.
Edited by ScooterX - 3/30/13 at 3:44pm
post #7212 of 9844
That's entirely fine as long as all 4 channels output equal amounts of power. They don't have to be equal powered amps, just output equally.

Not really necessary though.
post #7213 of 9844
post #7214 of 9844
Ah with winter gone I can finally start to annoy the neighbors again. biggrin.gif

post #7215 of 9844
Thread Starter 
surprising amount of bass extension for being outdoors. what is the tuning on that one? also, is that cabinet lined with fiberglass?
post #7216 of 9844
Quote:
Originally Posted by ScooterX View Post

Thanks for the clarification Bill. Though I was going to use four amplifier channels, using the existing passive crossover or at least that is a thought bouncing around my head. It's entirely possible that while I am waiting for this kit that I am over-thinking some things and missing others.
You can use four channels, two per cab, but you need an electronic crossover between the pre-amp and the amp, and leave the passives out.
post #7217 of 9844
Great to see the videos again. I think it was Rango the last video I heard and that song. biggrin.gif
post #7218 of 9844
Quote:
Originally Posted by mtg90 View Post

Ah with winter gone I can finally start to annoy the neighbors again. biggrin.gif

Wow, that's really something. What are the chances of you cutting that video into 2 different ones. Maybe something around the 2:55 minute mark? That last part really shows what they're capable of. I'd definitely put those up on the site.
post #7219 of 9844
how does this one differ vs the one that Rilla built? or is it the same one?
post #7220 of 9844
Quote:
Will the current Big Mal x over still work with these or will a new one be necessary? I would like to build a Big Mal with these.

I'm pretty sure a different crossover will be needed. The plan is that Erich's going to put the drivers into a suitable box and I'm going to do the crossover. Hope to get actual measurements now that the weather is warming up.
post #7221 of 9844
Quote:
Originally Posted by bwaslo View Post

I'm pretty sure a different crossover will be needed. The plan is that Erich's going to put the drivers into a suitable box and I'm going to do the crossover. Hope to get actual measurements now that the weather is warming up.

Sweet, im interested in building it for a center and was frown.gif when it vanished
post #7222 of 9844
Everyone has been in hibernation mode through winter, but it's finally starting to warm up.

The next projects we're all going to focus on will be center channels and possibly some smaller satellite type speakers. The center channels might also be morphed into some type of tower speakers. More info on those will be coming once they're started.

There's a very good chance of a pre-order SEOS-15 project coming very soon. As in a week.
post #7223 of 9844
Quote:
Originally Posted by Erich H View Post

Everyone has been in hibernation mode through winter, but it's finally starting to warm up.

The next projects we're all going to focus on will be center channels and possibly some smaller satellite type speakers. The center channels might also be morphed into some type of tower speakers. More info on those will be coming once they're started.

There's a very good chance of a pre-order SEOS-15 project coming very soon. As in a week.

Oh yeah! If I had more talent in the areas that you need help in I would do it in a second!
post #7224 of 9844
Quote:
Originally Posted by btinindy View Post

Oh yeah! If I had more talent in the areas that you need help in I would do it in a second!

Well I'm about to go hide a bunch of Easter eggs, so hurry on over! biggrin.gifbiggrin.gif
post #7225 of 9844
Quote:
Originally Posted by LTD02 View Post

surprising amount of bass extension for being outdoors. what is the tuning on that one? also, is that cabinet lined with fiberglass?

That says a lot because the mic on the camera starts to roll off at 100hz. Tuning is about 50hz with all three ports open, lined with denim insulation.
Quote:
Originally Posted by Erich H View Post

Wow, that's really something. What are the chances of you cutting that video into 2 different ones. Maybe something around the 2:55 minute mark? That last part really shows what they're capable of. I'd definitely put those up on the site.

Uploading now. The first clip was only had a few watts running through the speaker. What I really want to do is replay that scene from Monsters Inc running just the center channel content through it and at a higher volume. I'll need to work up some 5 channel high to low level converter so I can use my old Yamaha HTR that does not have pre amp outs to drive the Behringer A500.

Edit, here is the shorter clip at the end:

Quote:
Originally Posted by Sibuna View Post

how does this one differ vs the one that Rilla built? or is it the same one?
Same design, he just used slot ports to keep height down so it would fit under his screen.
Edited by mtg90 - 3/31/13 at 12:38pm
post #7226 of 9844
I finally took some measurements of the Delta 12LFA combo today but I'm a little concerned with the high end roll-off. Nevermind the midbass rockyness I shot off the workbench into the driveway just for prelim confirmation crossover etc was correct so the measurements arent't perfect. What I was basically looking for was smooth crossover region and flat extension to ~18K.

Thoughts? Ideas? IDK. I didn't have time to remove crossover to triple check it but I was pretty sure it was right?

68404

This is my reference RBH TK-515C I swapped in to make sure measurement gear was OK....

68403
post #7227 of 9844
Quote:
Originally Posted by NicksHitachi View Post

I finally took some measurements of the Delta 12LFA combo today but I'm a little concerned with the high end roll-off. Nevermind the midbass rockyness I shot off the workbench into the driveway just for prelim confirmation crossover etc was correct so the measurements arent't perfect. What I was basically looking for was smooth crossover region and flat extension to ~18K.

Thoughts? Ideas? IDK. I didn't have time to remove crossover to triple check it but I was pretty sure it was right?

68404

This is my reference RBH TK-515C I swapped in to make sure measurement gear was OK....

68403

First, that isn't midbass rockyness, it's the midrange, and from the graph the speaker's response should cause vocals to sound very forward. Now, regarding the high end - is this a DNA-360 and SEOS waveguide, or something else? If it is the DNA-360 then I really doubt the crossover is designed to roll the tweeter off 20dB by 18kHz. Make sure you do not have a shunt inductor in the tweeter's circuit accidentally wired in series with the tweeter instead going to the negative.
post #7228 of 9844
Quote:
Originally Posted by robotbunny View Post

Certainly, yes. I think Jeff was just saying it could be done that way to demonstrate the methods' simplicity. I definately intend to start with accurate acoustic measurements and go from there. smile.gif

Just to clarify: I didn't mean you that you don't need accurate measurements. I meant that you don't need "flat" response measurements. The data can have wide swings in the response and this method will still be just as accurate if it's good data.

Jeff
post #7229 of 9844
Quote:
Originally Posted by noah katz View Post

Is there a reason this is better than the much easier and seemingly less error-prone method of inverting one of the drivers and adjusting relative position for the deepest notch at XO?

This method of inverting and finding a null does not tell you the time (path length) relationship between two drivers, and won't give you the information you need for crossover design. It may be easy, but it's not what you want.
post #7230 of 9844
Quote:
Originally Posted by Jeff Bagby View Post

Just to clarify: I didn't mean you that you don't need accurate measurements. I meant that you don't need "flat" response measurements. The data can have wide swings in the response and this method will still be just as accurate if it's good data.

Jeff

Jeff, thanks. Yes, I have a firm grasp of the process outlined in your relative acoustic offset paper, I just did not explain myself well enough. With the three measurement method, the summed response in the overlay doesn't need to be ruler flat even though it should be an exact representation of the individual driver responses. It may be a touch easier for the dips and peaks to be present to help align the calculated response and may reveal testing atmosphere anomalies, imo. If there were too many irregularities in the waveform, I would essentially treat the process as ancillary data to simply provide me with offset numbers. Provided all constants remain unchanged, though, I'm going to have as accurate acoustic measurements as I can and test the sim in PCD before even putting the mic away. I'm using Omnimic btw, so I won't need to extract minphase etc. Thank you so much for PCD!

-Nate
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