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Old 29th December 2010, 10:32 PM   #11
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Looking forward to hearing your feedback when your designs are done.
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Old 29th December 2010, 10:37 PM   #12
nikko03 is offline nikko03  Norway
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Quote:
Originally Posted by Scottmoose View Post
Nothing wrong with your English -it's a lot better than my Norwegian (to my deepest shame, given that I'm about 1/2 Norwegian myself).

Well, to get the ball rolling, here's a Vb = Vas, Fb = Fs MLTL.

Internal dimensions = 56in x 10.5in x 14in (HxWxD). Zd = 21.125in. Zvent 54in. Vent 4in diameter x 3.5in long. Line box top, back & one sidewall with acoustic fiberglass or similar & adjust damping quantity and / or vent length to tailor to your system / room / taste requirements.
Thank you for your contribution it will be tested along with other designs
And measurements are always greatly appreciated
The loudspeaker's will be driven by a jolida EL34 tube amp so i hope to
get a good match and DIY is always fun i think
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Old 29th December 2010, 11:09 PM   #13
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So many neat full range drivers available nowadays! Good luck with your project!
Zilla
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Old 30th December 2010, 07:02 AM   #14
nikko03 is offline nikko03  Norway
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Quote:
Originally Posted by hasaudio.co.nz View Post
Looking forward to hearing your feedback when your designs are done.
I cant wait to start experimenting with the drivers and i will try to post it here
as soon as i get some meningful results
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Old 30th December 2010, 07:09 AM   #15
nikko03 is offline nikko03  Norway
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Quote:
Originally Posted by Godzilla View Post
So many neat full range drivers available nowadays! Good luck with your project!
Zilla
Thank you i really belive this driver can sound nice if i get the enclosure right.
It may take me some time to nail it. but that's just a part of the hobby right
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Old 30th December 2010, 02:03 PM   #16
hm is offline hm  Europe
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Default NIKKO

Hello,
i would prefer my double horn for that driver:
SAXOPHON, POSAUNE XL, RDH20
with a second driver e.g. Monacor SPH-210
Bass 34 Hz, lowest membran movement,
best IMP for Tubes.
Attached Images
File Type: jpg rdh20 seiteweb.jpg (18.9 KB, 2501 views)
File Type: jpg saxophon nirvana.jpg (64.7 KB, 2358 views)
File Type: jpg posaune-XLTK.jpg (71.0 KB, 2262 views)
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Old 30th December 2010, 02:40 PM   #17
sreten is offline sreten  United Kingdom
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Hi,

Whilst I agree with the recommended sealed box loading, I don't the vented.
Around 90L tuned to 28Hz will give ~ +6dB more bass at 30Hz and maximise
the efficiency below 100Hz, which is want you want for limited valve watts.

Unlike e.g. Lowthers or Fostex's, the excursion capabilities look quite
good, so a vented box may be all you need to use the driver very well.
Due to the low tuning above, IMO nothing more exotic will be needed.

Note the response shown includes the BSC effects of 60L closed box.

I severely recommend EQing at line level rather than an inductor and
resistor at speaker level, this will rob you of precious valve watts,
(to a degree, it also gives a very easy midrange and treble load).

Build something like this into the end of the power amplifier lead :
Baffle Step Compensation
Fixed line level BSC based on Rod Elliot's circuit

It will be far more effective, Any EQing will increase the dynamic range.

A box similar to this might be an idea :
Audio Note
Mount the driver higher obvously. The wide baffle will lower the
BSC point allowing more interaction with room effects / gain.

Ideally make mirror image pairs and spread the driver to edges spacing,
top:sidetherside ~ 0.6 : 1 : 1.6 to spread out diffraction ripple.

rgds, sreten.
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Last edited by sreten; 30th December 2010 at 02:51 PM.
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Old 30th December 2010, 04:06 PM   #18
nikko03 is offline nikko03  Norway
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Thanx to the two previous posters i really appreciate your insight and every sugestion will be looked in to.
the driver are now in house and the fun can begin
I will start with a 60L closed box and listen to that for a while.
it's just to get an idea of what i can expect from the drivers.
and i will try eq at line level ,that seems as a really god idea
I have to say that the help i recive in here is great. I am glad i joined this forum. Thanx to all of you and keep it coming
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Old 30th December 2010, 04:43 PM   #19
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You are very fast

Nelson use this seas in openbaffle with eminence 15"
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Old 30th December 2010, 05:21 PM   #20
sreten is offline sreten  United Kingdom
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Hi,

I'd suggest starting off with a 90L floorstander as outlined above
and filling the bottom third or so of each cabinet with sand for
checking out the sealed alignment, vented would then be easy.

rgds, sreten.
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