open baffle project

[aidynphoenix]

That would be IB not OB.

i have been under the impression that the goal of the baffle is to try and seperate the back and front waves... so bigger is better.
so IB would be the best case setup for testing woofers for OB use right?

or do i need to learn something new again?

 

[RayW]

Man, with so many things to possibly make comb filtering audible, you have to wonder how did Infinity or a speaker like the Pipedreams arrays get away with it.

They researched the things I listed above. Center-to-center distances were minimized, crossover points were set based on them, and the size of the array was used to take the floor and ceiling out of the room effects (effectively ). It can be done scientifically...just not at the Wankderosa.

 

[djnagle]

i have been under the impression that the goal of the baffle is to try and seperate the back and front waves... so bigger is better.
so IB would be the best case setup for testing woofers for OB use right?

or do i need to learn something new again?

If it sounds good in IB, it won't necassarly (SP) sound good in OB. If the back wave has a chance to interfer with the front wave, it changes things.

 

[TerryO]

They researched the things I listed above. Center-to-center distances were minimized, crossover points were set based on them, and the size of the array was used to take the floor and ceiling out of the room effects (effectively ). It can be done scientifically...just not at the Wankderosa.

There was also a lot of research done on the old "Bass List" regarding line arrays.

I seem to remember the caution about using floor to ceiling driver arrays in order to maintain a cylindrical wave front. A full length planar or ribbon driver seems to have been considered the ideal for meeting this criteria with line arrays.

Best Regards,
TerryO

 

[doucanoe]

They researched the things I listed above. Center-to-center distances were minimized, crossover points were set based on them, and the size of the array was used to take the floor and ceiling out of the room effects (effectively ). It can be done scientifically...just not at the Wankderosa.

Hey wait a minute there. When Wanklab enters into a serious project there is a lot of "science" involved. When it goes beyond woofer tester and Win ISD it's just other peoples science many times. Kind of like building a tube amp. No real need to reinvent the wheel (circuit) if it has already been sorted out.

Not to fear though, the line array has never been attempted at the Wankdarosa and probably won't be. Just not a whole lot if interest I guess. Single driver OB's can be cool but a whole bunch of little drivers mounted on a baffle vertically or otherwise just doesn't get me all worked up.

RC

 

[djnagle]

I said that for years RC. Just didn't make a lot of sense. BUT, one day I found 16 NSB drivers under my bed that I'd bought years earlier and totally forgot about.

Do you remember the eWave-O-rays I built? Well, I am a beliver in LA now.....if done right. Not to say that I would give up my horns, but I don't dis them anymore.

 

[doucanoe]

I said that for years RC. Just didn't make a lot of sense. BUT, one day I found 16 NSB drivers under my bed that I'd bought years earlier and totally forgot about.

Do you remember the eWave-O-rays I built? Well, I am a beliver in LA now.....if done right. Not to say that I would give up my horns, but I don't dis them anymore.

I do remember seeing them and Ray's speakers also. Wish I was closer so I could have a listen. They sure looked interesting and with Ray crunching the initial numbers, sure they sounded great also.


No, no. No dis at all Dennis. It's just nothing that has peaked my interest to date. I guess I'm just a low tube power minimalist that likes horns, 2-ways in particular. Seeing too many drivers just makes me nervous



RC

 

[djnagle]

Yep, I am still a low power horn guy. Have you listen to the TrueXtent barrilium diaphragms in your JBL 244X??? Not only are they supper clean, they take the high end up to 20K. It is the same material used in the TAD 4001s.

 

[doucanoe]

Yep, I am still a low power horn guy. Have you listen to the TrueXtent barrilium diaphragms in your JBL 244X??? Not only are they supper clean, they take the high end up to 20K. It is the same material used in the TAD 4001s.

Not yet, but they are on the hit list as soon as I find myself back with suitable 2" horns that can take advantage of them in a 2-way with my 2441's. Besides a pair of 2380's, 2395's and some other similar 2" horns that I have long forgotten about, all I have are 1" drivers and horns about the place.

I'm saving my pennies but for the going price of around $1200 over and above the cost of the horns, it's going to take a bit


RC

 

[aidynphoenix]

hm.. you guys got me thinking..
size of the drivers in relation to driver speed.

would it be safe to assume that smaller papercone, speakers, might be faster than a larger 10" or 12" papercone woofer??

 

[doucanoe]

 

[djnagle]

hm.. you guys got me thinking..
size of the drivers in relation to driver speed.

would it be safe to assume that smaller papercone, speakers, might be faster than a larger 10" or 12" papercone woofer??

That is what I found Aid. The 8 4" drivers in my arrays added up to just about the same square area as a 15" woof but because they are so small, they were much faster to react. I was shocked the first time I heard them. They kick like a mule.

 

[dnewma04]

hm.. you guys got me thinking..
size of the drivers in relation to driver speed.

would it be safe to assume that smaller papercone, speakers, might be faster than a larger 10" or 12" papercone woofer??

Nope, not a safe or correct assumption, at all. But you will hear a lot of people claim it to be.

 

[djnagle]

Well..... I think it is a matter of mass. If you have a given mass and move it, the inertia will dictate it takes a given amount of time to stop and reverse direction. If you have the same amount of mass but in 8 smaller bits, the inertia is less so it can stop and change direction faster. This would make for tighter sound.

 

[dnewma04]

8 lightweight cones with 8 equally lightweight motors?

The ability to stop/start quickly in a speaker is to a huge degree dictated by inductance. Mass does have a secondary (but orders of magnitude smaller) impact on driver acceleration. The primary advantage a smaller driver might have over a larger one is a smaller voice coil that could have lower inductance. The reason why the TD series of drivers by AE Speakers perform so well to such a high frequency is primarily because the inductance is obnoxiously low with the Lambda motor.

 

[clydeselsor]

Or you could build a horn....

Very cool!

 

[aidynphoenix]

then is it safe to assume. that low impendence speakers with lightweight cones in a array might pack a whallop?
assuming that they have good frequency range and sound characteristics?

or would it mean that because it is a array that the impendence is higher prettymuch nomatter what?

 

[dnewma04]

then is it safe to assume. that low impendence speakers with lightweight cones in a array might pack a whallop?
assuming that they have good frequency range and sound characteristics?

or would it mean that because it is a array that the impendence is higher prettymuch nomatter what?

I'm not sure that either conclusion is a safe assumption.

 

[aidynphoenix]

bear with me this is kinda hard to explain my question.

lets say you are useing 8 speakers total to make a array, and each speaker is 2ohms by itself, if you have the array set up to be a total of 4 ohms useing series and paralell wireing, would that array of 8 speakers at 4ohms move slower compared to two of the same exact drivers in series making 4ohms?

 

[dnewma04]

No.