[ebag4]

Betsy and Alphas






Sorry for the pics being sideways.....

Very cool, I like the design.  How do they sound?

Best,
Ed

[Guy 13]

Hi zimmer64,
here they are in the right position.
By the way, I like the configuration of your Open Baffle.
I wonder of your way is better than my mine ?
Cannot post a picture of mine,
maybe later, the Internet connection is too slow right now.

Guy 13

[zimmer64]

@Guy 13: Thanks for turning the pictures. I could not do this on the iPad
@ebag4: They sound pretty good.

The slot loading lowers the FS a bit. They produce lots of bass output, no sub woofers required. I am using a Behringer DCX 2496 as crossover and 2 gain clones for active amplification. I crossed over at 200Hz 6dB Butterworth high pass and 24 dB LR low pass. Betsy needs quite some EQ in the treble region. I will either add a dipole tweeter crossed between 3-4 Khz and make it a 3 way design or replace Betsy with the Tangband W8-1772.

[FullRangeMan]

Hi zimmer64,
here they are in the right position.
By the way, I like the configuration of your Open Baffle.
I wonder of your way is better than my mine ?
Cannot post a picture of mine,
maybe later, the Internet connection is too slow right now.

Guy 13

Your datalink is 15Mbits this is not slow.

[ThePriest]

Hello everybody.
Two years ago, I decided to build my own loudspeakers.
The speakers I was using at the time were very good, but needed a lot of volume/power to open up, especially in the bass region.
I wanted my speakers to sound good at all level I might conceivably use, but especially with low levels, so I can enjoy music when the kids are sleeping.
I eventually ended up building open baffle speaker after I heard a very promising implementation.
I was very kindly offered to try a 130 cm ribbon driver, which I was allowed to spend several months with before deciding to buy it.

For the bass system, I decided to go for GR-research OB subs, having heard Erpeders speakers, and also a pair of AE 18" dipole units.
It has taken me a while, but last week I finally had them both up and running.



The baffles are made from 4 mm steel, and has a wing on the side next to the mid-drivers, inspired by Danny Richies designs.
On the back of the steel I have glued a 30 mm slab of Baltic Birch ply to mount the midrange drivers in, ensuring a 2 mm layer of non-hardening glue.
This is to reduce vibrations transferred to the metal baffle, and to give me the 6 mm recess needed to mount the Vifa-drivers flush.

I have treated the steel with acid, in order to give it a sort of 'natural' look.

Cheers!

The Priest

[a.wayne]

Hi there,

These are my OB, I am using a full range unit of my own design, special designed for OB.. I use a sub for frequency’s below 80 Hz.

Hello Frank ,

Very nice setup , speakers look like maggies from the side What amplfiers are you using? they look proper .


Regards

[Peter J]

I have treated the steel with acid, in order to give it a sort of 'natural' look.

Cheers!

The Priest

Great looking arrays. Any chance we could see some close-ups of the metal finishing? I've played around with chemical patinas and am always curious to see what others have done.

[ThePriest]

Thanks Peter.
I'll try to take a few pics, but it is very dark when I get home from work, so it might have to wait until the weekend.

/The Priest

[Guy 13]

Hi all,
maybe next year,
I will be reunited with my beloved sound system
and if I can find a few boards of MDF
I will do some experimenting
with the four extra 12 inches Eminence Acoustinator woofers
driven by my GR Research 250 watts plate amplifiers.
I might try the U frame configuration and compare them side by side
with my H frame enclosures ????
I wonder if any AudioCircle members did that side by side comparaison.

Guy 13


 

[Guy 13]

@Guy 13: Thanks for turning the pictures. I could not do this on the iPad
@ebag4: They sound pretty good.

The slot loading lowers the FS a bit. They produce lots of bass output, no sub woofers required. I am using a Behringer DCX 2496 as crossover and 2 gain clones for active amplification. I crossed over at 200Hz 6dB Butterworth high pass and 24 dB LR low pass. Betsy needs quite some EQ in the treble region. I will either add a dipole tweeter crossed between 3-4 Khz and make it a 3 way design or replace Betsy with the Tangband W8-1772.

Hi zimmer64,
it's too bad Omega does not sell anymore his Omega 7F. 
I wonder how it would compare to the Betsy or TangBand W8-1772 ?????

Guy 13

[zimmer64]

Hi zimmer64,
it's too bad Omega does not sell anymore his Omega 7F. 
I wonder how it would compare to the Betsy or TangBand W8-1772 ?????

Guy 13

Hi,

I now ordered a tweeter (BG Neo-3) and will report back as soon as it is installed.

Michael

[ebag4]

Hi,

I now ordered a tweeter (BG Neo-3) and will report back as soon as it is installed.

Michael

Hello, do you mind sharing where you found the BG Neo3 for sale?

Best,
Ed

[zimmer64]

Ordered it here last week: http://www.audax-speaker.de/index.php?module=shop_articles&index%5Bshop_articles%5D%5Baction%5D=overview&index%5Bshop_articles%5D%5Bcategory%5D=11

149 Euro a pop minus VAT plus pp

[zimmer64]

.

[Guy 13]

WOW !
Micheal that post # 133 of yours is the shortest in AudioCircle history. 

Guy 13

[FullRangeMan]

Hi zimmer64,
it's too bad Omega does not sell anymore his Omega 7F. 
I wonder how it would compare to the Betsy or TangBand W8-1772 ?????

Guy 13

You dont like the 96db Visaton B200?
and Planet10 have wood phase plugs.

[Guy 13]

You dont like the 96db Visaton B200?
and Planet10 have wood phase plugs.

Hi FullRangeMan.
It's not that I don't like the Visaton B200,
it's the fact that Omega is Made in the US of A
and I like that.
For the Planet10, unless I am wrong,
I think their sensibility is very low.
Any drivers with less than 92dB is not compatible
with my Decware SE84C+ at 2wpc.
If one day my Omega 7F failed,
I will see with what I will replace them with
and I am sure that my search wont be easy,
let's just hope they last until I kick the bucket. 

Guy 13
 

[FullRangeMan]

Hi FullRangeMan.
It's not that I don't like the Visaton B200,
it's the fact that Omega is Made in the US of A
and I like that.
For the Planet10, unless I am wrong,
I think their sensibility is very low.
Any drivers with less than 92dB is not compatible
with my Decware SE84C+ at 2wpc.
If one day my Omega 7F failed,
I will see with what I will replace them with
and I am sure that my search wont be easy,
let's just hope they last until I kick the bucket. 

Guy 13

I mean day Planet10 have phaseplugs for the B200.
I think B200 is 96dB as OB, do you think otherwise?

[Guy 13]

I mean day Planet10 have phaseplugs for the B200.
I think B200 is 96dB as OB, do you think otherwise?

Hi (Again) FullRangeMan,
I cannot comment on the sensivity of the Visaton B200
mainly because I am (For now) not interested in looking
at any other full - extended range drivers.
With a 2wpc amplifier, a 96dB driver is almost a must.

Guy 13

[mcgsxr]

I used the b200's on OB for over 8 years.  I ran them with an SEP el84 Maggie amp.  3-4wpc max.  The Planet10 phase plugs were an excellent improvement for a little $.

Loved those speakers.  I used diy 12 subs on each panel, biamped wih a plate amp.