chops
-
Posts
1532 -
Joined
-
Last visited
Content Type
Forums
Events
Gallery
Posts posted by chops
-
-
where's the 4th 15" in that speaker ...??
Actually, that one you see in the middle on the rear panel is just a 12" passive radiator to help absorb the back wave that bounces off the back wall.
The 15's are compound loaded, or isobaric (one behind the other). There's two up top and two on the bottom.
Like this...
-
that is why i think that it might actually make some sense to use horns with your dipole woofs. just guessing though.....
boy!!
Use horns with the dipoles? As in bass horns? That would defeat the purpose of going with dipoles in the first place.
no use mid and tweet horns with the dipole bass section.....
Oh!
Well yes, I plan on using my Altec 511B/902-8B combo with the dipole bass section.
-
Chops,
If you are interested in dipole bass spend a lot of time reading the various articles on this site:
The speaker you posted a picture of above looks like a ripoff of the Orion from that site above.
Shawn
Hey Shawn,
I have news for you, I've been writing Siegfried for quite some time now. We spoke a lot when I was planning my dipole subs several years back, and now with my current project as well. Trust me, I nearly lived on his site for a while. LOL
And as for this speaker, it is the Jamo R 909. As far as I know, no one makes anything like it, at least not that kind of styling.
Also, Legay has been making the Whisper for years now, and it has always been an open baffle (dipole) design, however using FOUR 15" drivers per channel.
-
that is why i think that it might actually make some sense to use horns with your dipole woofs. just guessing though.....
boy!!
Use horns with the dipoles? As in bass horns? That would defeat the purpose of going with dipoles in the first place.
-
Speaking of alternative designs, has anyone ventured into doing an open baffle design at all with dual 15's per channel?
With the right drivers, one can easily match the sensitivity ( <105dB 1w/1m) of the squawker, get excellent, clean midrange up to 600Hz and natural, ultra-fast and dynamic bass to an extent before implementing active EQ'ing to compensate for the dipole roll-off in the lowest octaves.
This is exactly what I have in the works at the moment. I'm doing some research just to "freshen up" before jumping in head first. This ought to be some fun times coming up soon! [
]what kind of directivity (coverage angle) are you going to go with?
I'm not sure I follow. If you're referring to the "sweet spot", dipole loudspeakers generally have a broader area rather than just a "spot".
well every direct radiator has a characteristic coverage pattern. usually about from low freq to high, it starts off wide dispersion that narrows down to about 120 degree for a certain bandwidth then beams down to about 90 degrees over a certain bandwidth and then starts to collapse. where it starts to collapse is determined by the voice coil diameter. so say you are going to use 15". it is 120 degree from about 300 to about 600 then 90 degrees from 600 to about 1400 hz for a 3" voice coil. this is all approximate since i have slept since then. putting the woofers one on top of another with literally not much space between the frames means that the woofers will create a bubble (d'appolito) that resembles a coverage pattern of about 90 to 70 degrees at about 900 hz. so you could essentially have 90 degrees to about 300 hz.
now take a cabinet without a back and whose sides, top and bottom are about 40" deep and you should be able to start dipole action about 300-400 hz. now you could extend the 90 degree coverage pattern well below 100 hz as long as you can keep the amplitude up.
is that what you meant about open baffle? or are you going to mount dual 15" on the back as well to make a dipole in an box?
boy!!
Hi Roy,
This is what I mean by dipole (open baffle)...
The drivers being used will most likely have a 2.5" VC. They will be crossed over at 600Hz to the 511B/902-8B and will be augmented on the bottom by an EQ to compensate for the dipole roll-off.
it is open back... okay here is my guess with the yellow speaker above. the woof coverage pattern is probably the equivalent of 50 degrees vertical from about 900 hz down to about 500 or 400 Hz and in the horizontal, the dipole effect will probably start at about 400 hz and get to 90 degrees. do you know how much boost will be required at about 50 Hz? just curious because of the amount of displacement the woofers will have to experience.
boy!!
Roy,
Depending on the baffle size and the Fs of the drivers used, I'll probably have to start boosting right around 50Hz or so to a MAX anywhere between +5 to +12dB at 20-30Hz.
Which with my Behringer DEQ1024, I have a selectable boost range of -6 to +6dB, -12 to +12dB and 0 to +24dB. And on my Rane AC 22B, I can adjust the time delay of the woofers.
I'm not too sure how concerned I would be with the coverage pattern since I only listen to my system in the "sweet spot". If I'm not in THAT spot, then I'm in another room so the coverage still doesn't matter at that point. At least, not to me.
BTW, after a little more driver research, depending on funds at the time, I may even try going with four Selenium 18" drivers just for a little added oomph! They have slightly less Qts (0.46), but they have quite a bit more surface area, better frequency response (35-3000Hz), lower Fs (33Hz), and just a little bit more Xmax (3.75mm).
-
The credits look fine on my 9 foot wide screen.
-
Speaking of alternative designs, has anyone ventured into doing an open baffle design at all with dual 15's per channel?
With the right drivers, one can easily match the sensitivity ( <105dB 1w/1m) of the squawker, get excellent, clean midrange up to 600Hz and natural, ultra-fast and dynamic bass to an extent before implementing active EQ'ing to compensate for the dipole roll-off in the lowest octaves.
This is exactly what I have in the works at the moment. I'm doing some research just to "freshen up" before jumping in head first. This ought to be some fun times coming up soon! [
]what kind of directivity (coverage angle) are you going to go with?
I'm not sure I follow. If you're referring to the "sweet spot", dipole loudspeakers generally have a broader area rather than just a "spot".
well every direct radiator has a characteristic coverage pattern. usually about from low freq to high, it starts off wide dispersion that narrows down to about 120 degree for a certain bandwidth then beams down to about 90 degrees over a certain bandwidth and then starts to collapse. where it starts to collapse is determined by the voice coil diameter. so say you are going to use 15". it is 120 degree from about 300 to about 600 then 90 degrees from 600 to about 1400 hz for a 3" voice coil. this is all approximate since i have slept since then. putting the woofers one on top of another with literally not much space between the frames means that the woofers will create a bubble (d'appolito) that resembles a coverage pattern of about 90 to 70 degrees at about 900 hz. so you could essentially have 90 degrees to about 300 hz.
now take a cabinet without a back and whose sides, top and bottom are about 40" deep and you should be able to start dipole action about 300-400 hz. now you could extend the 90 degree coverage pattern well below 100 hz as long as you can keep the amplitude up.
is that what you meant about open baffle? or are you going to mount dual 15" on the back as well to make a dipole in an box?
boy!!
Hi Roy,
This is what I mean by dipole (open baffle)...
The drivers being used will most likely have a 2.5" VC. They will be crossed over at 600Hz to the 511B/902-8B and will be augmented on the bottom by an EQ to compensate for the dipole roll-off.
-
-
Speaking of alternative designs, has anyone ventured into doing an open baffle design at all with dual 15's per channel?
With the right drivers, one can easily match the sensitivity ( <105dB 1w/1m) of the squawker, get excellent, clean midrange up to 600Hz and natural, ultra-fast and dynamic bass to an extent before implementing active EQ'ing to compensate for the dipole roll-off in the lowest octaves.
This is exactly what I have in the works at the moment. I'm doing some research just to "freshen up" before jumping in head first. This ought to be some fun times coming up soon! [
]what kind of directivity (coverage angle) are you going to go with?
I'm not sure I follow. If you're referring to the "sweet spot", dipole loudspeakers generally have a broader area rather than just a "spot".
-
Funny... Back when I wore glasses, I used to do the same exact thing. The real funny thing is that I thought there was a difference in sound as well.
-
So no input about open baffles?! [:|]
-
No doubt quick, I would think with the bigger engine directly over the front axle as opposed to behind it, you would get alot more front end plow, sure does not look that way in those pictures of the guy racing it though.
Dang!.... LOL
Seriously though, I thought the same thing, but apparently the Ford 5.0L motor only weighs about 70lbs more than the stock Miata 1.8L motor! I don't understand that, but that's what everyone says. All they have to do is beef up the suspension a little bit up front and they're ready to go.
And if I remember correctly, the 5.0L motor actually sits back about 2" further than the 1.8L, helping a little with weight transfer. [
]Dang! Sounds like a no brainer, assume the regular tranny can't handle all that new torque, so you can get a new 6 speed or a mustang 5 speed to boot. Does Ford make a 6 speed?
Yeah, I think the Cobra's, Saleen's and SVT's have or had 6-speeds. I'm not 100% sure though as I really haven't kept up with the latest and greatest from Ford.
Honestly, I wouldn't mind throwing a turbo or supercharger on the 1.8L, but you just can't beat the low end grunt and sound of a V8 rumbling under the hood. And to have one in a little-*** stock looking Miata is all the better! [6]
Oh yeah, and DANG! LOL [
] -
At some point (not sure when) we really will redo all the photography which is admittedly crappy. I am not a photographer. We've really struggled with that aspect. md
What are you talking about?! The interior pics are perfect, with excellent lighting and exposure. I thought you did pretty damn good. And I deal with pro photographers every day! [
] -
And then he woke up with a cold sweat from the nightmare he just had!
Yeah, he's not the only one! [+o(]
-
Yep, that's a great looking site you've got going there, Mark. And I have to say, excellent photography on the internal shots. Now only if you could get the Peach and Xtreme face plate shots to look like the Merlin's, I think that would be the nuts! [
] -
No doubt quick, I would think with the bigger engine directly over the front axle as opposed to behind it, you would get alot more front end plow, sure does not look that way in those pictures of the guy racing it though.
Dang!.... LOL
Seriously though, I thought the same thing, but apparently the Ford 5.0L motor only weighs about 70lbs more than the stock Miata 1.8L motor! I don't understand that, but that's what everyone says. All they have to do is beef up the suspension a little bit up front and they're ready to go.
And if I remember correctly, the 5.0L motor actually sits back about 2" further than the 1.8L, helping a little with weight transfer. [
] -
chops - yes, please let me know what works best for the 2 of you, with a backup date in case I'm tied up that day. Look forward to finally meeting you two!
Mike
Will do sir! I look forward to it as well, and hearing some La Scala's. [
]Can you imagine a 302 in the Miata?????
Especially a mildly hopped-up one, yes I can!
In fact, there's a guy here in town with a 1st Gen Miata that has a 302 in it, but he's a snobby SOB, so I don't even bother trying to talk to the schmuck.
The link below is NOT the guy I was referring to.
http://justanothertoy.com/miata.htm
-
Speaking of alternative designs, has anyone ventured into doing an open baffle design at all with dual 15's per channel?
With the right drivers, one can easily match the sensitivity ( <105dB 1w/1m) of the squawker, get excellent, clean midrange up to 600Hz and natural, ultra-fast and dynamic bass to an extent before implementing active EQ'ing to compensate for the dipole roll-off in the lowest octaves.
This is exactly what I have in the works at the moment. I'm doing some research just to "freshen up" before jumping in head first. This ought to be some fun times coming up soon! [
] -
That's Spelling Police, I don't police typos, your on you're own there.
That last bit is for the Grammar Squadron,
Now are you gonna be Tough or Sensitive? It's difficult to imagine someone could be both.
Again, no comment...
-
Chops,
I gotta get you and your brother to come over for another little get-together. I was thinking on putting something together (just the 2 of you and 2 other friends) before Christmas. Does that interest you? If so, what might be a good time for the two of you? After your visit here we can turn the tables and I'll come check out your rigs. I have 2 sisters that live in Tampa so would just crash over there afterwards.
Let me know if you 2 are interested and what day works for you.
Hey Mike,
Thanks for the invite... again! LOL
Yeah, I'd still like to do that sometime as well. I'll have to get with my bro and see what and when we can do. I'll let you know as soon as the two of us get things figured out with work and such. [
] -
sense
Hey look, it's typo-police!... clown.[8-|]
-
Are you pms-ing again chops?
Nope, I'm quite regular, thank you. LOL
Just sick and tired of people telling ME what I do or don't know, or what I do or don't have experence with. Like they know...
Anywho... [H]
sorry man, I think you did it to yourself on that post- I found the reply hilarious.
just breathe in and relax man. geesh..
M
Umm... ah, nevermind.
-
Bill do I need to remind you that there is only one small block........350 c.i. stroked to 383 c.i.?????????
Yep... that's what I have under the hood in my car pictured in my avatar... 415hp and 417tq, and that's to the rear wheels. Not bad for a little ole 224/230 cam in her. [
] This one, however, is setup for the road courses and she is a mean little bugger. I run her at Sebring and have only been passed by a handful of cars there (Ferrari 355, modified Viper, and a few full-blown Porsche race cars), so she can handle her own. She's an absolute blast to drive!
Mike
Yeah, my next "power mod" for my little Miata will be dropping in a Blue Oval 302 with some nice heads and cam. Nothing over the top as this car barely weighs 2300lbs!!
-
Are you pms-ing again chops?
Nope, I'm quite regular, thank you. LOL
Just sick and tired of people telling ME what I do or don't know, or what I do or don't have experence with. Like they know...
Anywho... [H]
]
]
]
]
alternative designs- why go jubilee?
in Technical/Restorations
Posted
Hi Shawn,
The reason I want a dipole bass bin is because I had a pair of dipole subs before, and absolutely nothing compares to them, at least not from 20Hz on up anyway.
With dipole bass, nothing influences nothing, meaning there's no room interaction, there's no box interaction, no hallow, boomy, boxy sound, the bass is extremely fast, tight and precise, and they always seem to integrate well into the music. You're not limited by box tuning, port tuning, horn tuning, room position, port noise, enclosure resonances, etc, etc...
The only limiting factor really is the driver chosen.
You really have to be able to hear a pair of dipole woofers to truely understand what I'm trying to describe here. And the bass quality... It sounds REAL. There's no other way of putting it, other than REAL sounding.