Help needed! Where to start with open baffle speakers

[struth]

full range speakers can be used as reflex type boxes. ive made several sets and they have all worked well. you can also add a simple tweeter with a cap if you wish if its not going high enough. just have to work out the reflex tube size.

[paulf-2007]

The Beta is better than the Alpha for OB. I'd use a pair of Betas per side up to 200hz, then cross over to something like Alpair 12P as in the below thread, or Visaton B200 is also a good choice.

Good info here-

http://www.audio-talk.co.uk/phpBB3/v...php?f=4&t=6916

I run my OB's actively, see thread here-

http://theartofsound.net/forum/showt...OB-Experiments

visaton B200 are shouty, heard a pair in OB that usually were run active but as they were for sale I heard them passive. Not for me. I ran my alpha's up to 350hz with a front horn from 350hz - 2000hz, raal 140/15D ribbons at the top end with a deqx crossover.

Looked at your thread more about the otl than active ob's

[Ali Tait]

Cutting out the dust cap and using some Planet10 phase plugs sorts the shoutiness.

[bumpy]

Hi Thiha

I note you live in Essex. If you are any where near Bishops Stortford, you are most welcome to come over and listen to a very well constructed incarnation of the Endorphin P17 put together by Slawa at SW1X.

Cheers Chris

[ianlenco]

I've built a few OB's and enjoyed them all. Only downside is the size needed to get decent bass. Here's a few links that I found useful when I was getting started.



http://www.quarter-wave.com/Gallery/Gallery.html

http://www.iol.ie/~waltonaudio/ob.html

http://www.diyaudio.com/forums/multi...asurement.html

http://www.diyaudioandvideo.com/Tabl.../1stOrder.aspx and links within the page

http://musicanddesign.com/tech.html

http://www.lotusgroupusa.com/Granada.htm

http://www.diyaudio.com/forums/full-range/ lots and lots of builds

http://www.quarter-wave.com/OBs/OB_Theory.html

http://www.quarter-wave.com/Project08/Project08.html MJK's build with Jordans

These were my favourites using Jordan full rangers and 15" Visaton woofers.

[fatmarley]

Hi Thiha

I note you live in Essex. If you are any where near Bishops Stortford, you are most welcome to come over and listen to a very well constructed incarnation of the Endorphin P17 put together by Slawa at SW1X.

Cheers Chris

Did he design a proper crossover for these, or are they the standard ones from the Lampizator website?

I know someone (I wont mention his name) who heard a pair of the standard ones and described the sound as a "rollercoaster ride" (very far from a flat frequency response).

[RothwellAudio]

Just as an aside, I think it's worth pointing out that - although rarely referred to as such - Quad electrostatics are open baffle speakers. I'm not suggesting that the OP should make a pair of electrostatic speakers, just saying that panels/baffles of ESL size are capable of giving bass that satisfies most people. Well, I've never thought Quads were lacking bass, anyway.

[bumpy]

Did he design a proper crossover for these, or are they the standard ones from the Lampizator website?

I know someone (I wont mention his name) who heard a pair of the standard ones and described the sound as a "rollercoaster ride" (very far from a flat frequency response).

Believe me that Slawa would leave no stone unturned to get the best sound. He supplied his own crossovers using silver wiring throughout and top quality components such as Audionote capacitors etc. I cant give further details as

1. It would be unfair to plagiarise Slawa's IP
2. I don't really understand what was done

But they sure sound balanced across the frequency range.

[bumpy]

I know someone (I wont mention his name) who heard a pair of the standard ones and described the sound as a "rollercoaster ride" (very far from a flat frequency response).

Other approaches that I think are flawed in terms of musicality are

1. Going active on the base with masses of EQ
2. Boxing in, or partly boxing in, the base driver, thus moving away from the freedom of a true open baffle.

[Macca]

The bass is the bit that is hard to get right. Best I have heard were Gordon's with the dipole bass - think they were a Troel's design. Build some of them, you won't be disappointed.