2 way cabinet - USHER 8948A ? and 9950-20 or Fountek NeoCd3.0M

[kappa_ii]

hi all - i am new here .
i want to built a 2 wey speaker witch a 7 good woofer
i think at usher 8948A - is seems a very good woofer but if someone have some sugestion i am receptiv .

for tweeter i am not sure - a think also to usher - maybe 9950-20 or 9950t-15
or some ribbon Fountek NeoCd3.0M or aurom cantus ribbon

i have some questions
1 which is the major difference between ribbon and normal tweeter ?
2 what is the advantage or disadvantage of a 2-way speaker comparad with a 3-way ?

thanks

[kmibb]

hi all - i am new here .
i want to built a 2 wey speaker witch a 7 good woofer
i think at usher 8948A - is seems a very good woofer but if someone have some sugestion i am receptiv .

for tweeter i am not sure - a think also to usher - maybe 9950-20 or 9950t-15
or some ribbon Fountek NeoCd3.0M or aurom cantus ribbon

i have some questions
1 which is the major difference between ribbon and normal tweeter ?
2 what is the advantage or disadvantage of a 2-way speaker comparad with a 3-way ?

thanks

Based on your questions, it appears that you're very new to DIY audio. That being said, if you're going to build a speaker with nice drivers, build an existing, proven design. The people who make a lot of the designs you'll see in the Mission Accomplished thread are good at what they do. Crossover design for someone as new as yourself will probably be too much of a task. I'd hate to see you fail at making your own crossover with drivers that have so much potential.

That being said, look around on here and the PE TechTalk forums for existing designs using those drivers. I'd also take a look at designs using the SB Acoustics woofers, Dayton RS, Aurum Cantus, and anything from SEAS and ScanSpeak.

Hope this helps,
Kevin

[kmibb]

See if there is anything you like here:

http://htguide.com/forum/showthread.php4?t=28655

[kmibb]

Here is another great place to find designs

http://techtalk.parts-express.com/showthread.php?t=211558

[BobEllis]

Don't try to go from a 7" woofer directly to a ribbon. See zaphaudio's ribbon test - http://www.zaphaudio.com/nondomes you'd need to cross much higher than most 7" drivers are comfortable or lower than the tweeter can do without distress at higher SPL.

I'll second the suggestion to go with a proven design for your first build. Study it and learn how the crossover works, how it interacts with the drivers' response and impedance irregularities. Zaph has some nice designs, too.

[Carl V]

SalkSound HT-1 with Dennis Murphy's XO does nicely with a SEAS7" & Ribbon.
Selah Audio has a few such offerings SSR, Mejor, Verita.
Owned an SSR & heard a few HT1s

They all sounded quite nice. It's doable imho.
It'll take some talent I am sure.

[kmibb]

SalkSound HT-1 with Dennis Murphy's XO does nicely with a SEAS7" & Ribbon.
Selah Audio has a few such offerings SSR, Mejor, Verita.
Owned an SSR & heard a few HT1s

They all sounded quite nice. It's doable imho.
It'll take some talent I am sure.

I haven't seen Dennis Murphy's design, but I know the Selah Audio ones use RAAL ribbons, which will cross that low. However, they are much more expense than the Fountek, which cannot cross nearly as low.

[kappa_ii]

k

k -

if i decide to make a three way speaker what middle driver is recommendad ?
i see that fountek neoCd1.0 is cheaper - 43$ and have 89dB - if i use it at higher then 4-5khz i think is very good .

the neocd3.0 has 95db , i don`t need theat much .
i have not heard ribbon tweeter is similar witch isodynamic in terms of sound ?

what do you think about usher 8948A ? how much can go 2-2.5khz ?
i understand that it is a very good middle woofer similar witch scan speak and some say that is better .
but if a go three way i thing is not that good , and can find something better and cheaper , maybe also from usher .

[rdrowley]

k -

if i decide to make a three way speaker what middle driver is recommendad ?
i see that fountek neoCd1.0 is cheaper - 43$ and have 89dB - if i use it at higher then 4-5khz i think is very good .

the neocd3.0 has 95db , i don`t need theat much .
i have not heard ribbon tweeter is similar witch isodynamic in terms of sound ?

what do you think about usher 8948A ? how much can go 2-2.5khz ?
i understand that it is a very good middle woofer similar witch scan speak and some say that is better .
but if a go three way i thing is not that good , and can find something better and cheaper , maybe also from usher .

I think the point of most of the responses is to find a proven design and use their suggested speakers and x-overs. Designing a x-over for a 2-way is difficult for a first timer. Designing a x-over for a 3-way is 10x harder than a 2-way. If you decide to go ahead and do it on your own anyway spend your extra cash on good measurement equipment and extra x-over parts for experimentation or on a nice adjustable active x-over and EQ.

[Undefinition]

What is your level of crossover design experience?

[BobEllis]

As you add drivers the crossover design becomes exponentially harder. A three way as a first project is much more likely to disappoint than a two way. If you are dead set on designing your own, I strongly suggest that you stick with a two way and a tweeter that can cross low enough to blend well with your woofer, like the RS28.

[kappa_ii]

k

in terms of crossover i don`t have experience - that`s why - i want to make it in two ways . I have some programs that simulate crossover , and some skilled friends who can help me .


i can copy an existing "tested" project . but i listened to some usher speaker with 8948A and a liked - the sound is warm but not slow , with good man voice reproduction and the bass was quite good . The usher DMD berilyum tweeter is not found in any store and i have to find a replacement .

after i finish the project , i can borrow a tester for necessary small changes in crossover .

RS28 seems to be made by Usher - similar witch 9950-20 .

if i make a three-way speaker i must choose a less expensive drivers .
and crossover price is perhaps more then double and very complex , complicated to do .

the grafic simulation and the volume of the box i want to do it in solidworks to be able to make my idea about the final look .
but first i have to decide what to use .

[kmibb]

Here are some 2-way designs using Usher drivers.

http://techtalk.parts-express.com/showthread.php?t=221775

http://techtalk.parts-express.com/showthread.php?t=218961&highlight=8945A

http://www.parts-express.com/pe/showdetl.cfm?Partnumber=302-855

I can't find any with the 8948A though.

If you want a great 3-way with a ribbon tweeter, check out the Statement Monitors. They have been built buy so many people on this forum so you can get all the help you want here. The drivers used are very well regarded.

http://www.speakerdesignworks.com/Statements_Monitor.html

[kmibb]

in terms of crossover i don`t have experience - that`s why - i want to make it in two ways . I have some programs that simulate crossover , and some skilled friends who can help me .


i can copy an existing "tested" project . but i listened to some usher speaker with 8948A and a liked - the sound is warm but not slow , with good man voice reproduction and the bass was quite good . The usher DMD berilyum tweeter is not found in any store and i have to find a replacement .

after i finish the project , i can borrow a tester for necessary small changes in crossover .

RS28 seems to be made by Usher - similar witch 9950-20 .

if i make a three-way speaker i must choose a less expensive drivers .
and crossover price is perhaps more then double and very complex , complicated to do .

the grafic simulation and the volume of the box i want to do it in solidworks to be able to make my idea about the final look .
but first i have to decide what to use .

Contact this guy, he has the beryllium tweeters, 8948As, and a lot of other Usher drivers for much less than retail.

http://techtalk.parts-express.com/showthread.php?t=221339&highlight=usher

[kappa_ii]

k

thanks for the info
i don`t know how i could buy from adam , i am from Romania , Europe , and i see that he has only one post on that trade .
I send him a message .

[kmibb]

thanks for the info
i don`t know how i could buy from adam , i am from Romania , Europe , and i see that he has only one post on that trade .
I send him a message .

Oh snap I didn't realize that. What drivers are available to you and where do you get them? That could limit your choices.

[kappa_ii]

k

i can buy from here

http://www.loudspeakershop.eu/

but the price , as you can see , is much higher then other places .
i have not found in europe an online shop with good price similar to those in US


Adam D does not respond ! i send him a e-mail and a private masage and i don`t received any replay .


i can buy from part express but i have to pay extra- for transport and "i don`t know how to say" custom payments .VAT.

That being said - better to focus on the choice of speakers - a good match for two way .

[kevinlin1013]

I own a pair of USHER 8948A.

They sound very will at this price range. My crossover is 3rd lowpass(electrical) at about 2050Hz

[kappa_ii]

a

does anyone have a filtre scheme for this two driver
8948A and 9950-20 ?
or even a complete project !?

[BOBinGA]

Dennis Murphy is a respected designer and he has an Usher 2 way design. It uses the 8945 instead of the 8948, but it uses the 9950 tweeter. Look here:

http://murphyblaster.com/content.php?f=usher2way.html

-Bob

[Silversmoky]

If you can switch to the 8945 Mark K also has a small design with these two drivers.

http://www.audioheuristics.org/projects_gallery/Usher_satellites/usher_index.htm

[kappa_ii]

a

i did a project in catia
volume 35 liters

[fjhuerta]

You need to understand that even your baffle design will affect your crossover topolgy and values... building a speaker is easy; building a good sounding speaker that will beat the pants off a commercial unit is something else. Trust me, I learned the hard way... I tried building an "ultimate" two-way for myself, and only finished it two years later, after I had spent lots of money buying new drivers, modifying the baffle, and re-building the speaker every three weeks. Had I known then what I do now, I'd have built a proven design, and I'd have measured everything every step of the way.

Honestly, I think it's the only way, unless you have someone who really knows his stuff helping you.

[Undefinition]

Well-said, Javier.

http://sites.google.com/site/undefinition/diy-faqs-provendesigns

[kappa_ii]

a

i understand , is complicated , but that does not make me stop :W

does anyone know how much inside volume has mini dancer 1 ?
from my calculation have a minimum 45 L (resulted from exact calculation - volume associated with weight box) , but from simulation 45L are to much .

can someone do some simulation and perhaps a suggestion to the optimal volume ! for 8948A



and for filter , there must be someone who has used this speaker .

[Johnloudb]

can someone do some simulation and perhaps a suggestion to the optimal volume ! for 8948A

An online box calculator:

http://www.linearteam.dk/default.aspx?pageid=newdriver

[rom]

http://techtalk.parts-express.com/showthread.php?t=212625&highlight=arpeggio

here one that uses Usher 8948A and 9950

[kappa_ii]

a

thanks
it seems quite ok

i try to find a 3-4 order filter .

by the way - does anyone know what volume have mini dancer 1 or be-718 ?

[kappa_ii]

i started the project
for a 22-23L inside volume what FB and size for vent port ?

in my simulation programs - one suggest 35hz and another 42 hz for FB
for port size 6.2 to 7cm for diameter .

what advantage or desadvantage occurs if the port is positioned at bottom ?

[Silver1omo]

You may want to take a look at http://sites.google.com/site/undefin...d-measurements