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rick57 View Drop Down
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Joined: 12 November 2005
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rick57 Quote  Post ReplyReply Direct Link To This Post Topic: 1/ 8 th space, 50 - 110 Hz, smoothness an
    Posted: 12 November 2005 at 6:54am

Hi

I’m looking for a stereo pair of active horns to go in a room about 21’ * 16’ * 9’.

To deliver up to 110 dB, firing into corners, from about 110 Hz down – about 50 Hz. (Above that will be JBL 106 dB midbass horns driven by a 2 watt tube amp). I just started looking, initially considered the LabHorn, but it’s probably overkill in dB.

What design/ drivers and preferably amp to match, would be the best option?

I’d prefer to decide it as a combination. I imagine with say 105 dB efficiency that 30-40 good watts (low distortion, high output impedance) should be enough.

Within the 50 - 110 Hz range, smoothness and fidelity are the main criteria.

It looks like all the FR graphs are into half space - are there any FR graphs of the 186 or 1850 driving into 1/ 8 th space?

As a guide to difficulty, how many pieces of wood in the 186 & 1850?

Thanks

Richard

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Mircea Bartic View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Mircea Bartic Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2005 at 9:53am
maybe the punisher would serve you well
in a corner you should reach 40Hz and and your desired spl

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rick57 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rick57 Quote  Post ReplyReply Direct Link To This Post Posted: 12 November 2005 at 8:21pm

Nexus

 

Thanks, documentation excellent, and it looks like they have great output.

 

Can anyone who reads Dutch say if Frederik's FR graphs www.speakerstore.nl/index.php?l=nl&pg=12&prjID=11 are half/ quarter/ ? space, and at how many watts?

 

Mine would be for hi-fi - any comments on smoothness or acoustic instruments eg double bass?

 

Thanks
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roborg View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roborg Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2005 at 9:08am
I would say the 186horn is probably a better choice as it will do 50hz 1/8th space & will be slightly lower distortion than an 1850 or punisher.  However, if you are only going to feed it 30watts the distortion levels will be very low for all the horns you could choose.
  i think the 160ish cm exponential of the 186/1850 will have a slightly better transient response than the longer exponential of the punisher & slightly less ripple too.  But again if you corner load the horn then this will help alot & with any sub-horn you'll probably get decent output down to 30hz with some equalization.  At less than 100watts you'll stay well within the xmax of any of the drivers used too.
  maybe you want to re-consider the labhorn as the overkill in dB would be worse if you chose a punisher or 186/1850.  I bet you'll use the capability of a lab/1850/punisher someday though
 
cheers
   Rob
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Jay Lawless View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jay Lawless Quote  Post ReplyReply Direct Link To This Post Posted: 14 November 2005 at 10:53pm
my guess is those graphs are either 1/2 or 1/4. i doubt its 1/8 or else the responce would be MUCH higher.
Previously known as NeverWinter

Background: Automotive, Live and Home Custom Design. mid/high level based design and feild experience. Bass specialist
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freddyi View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote freddyi Quote  Post ReplyReply Direct Link To This Post Posted: 16 November 2005 at 5:21pm
for double bass & drum transients I'd pick a Karlson (for 80Hz and tuned low + boosted per eXemplar ~30Hz w. Altec 416 or 515 - they used active bandpass - underdamped 2nd order will do a kluge) - but sound better away from corners & best IMO in smaller rooms with low-mass 15" coax or quasi-coax rather than w. horns on top. (K's do better with wideband woofer)  my 3 set of basshorns sit dormant for use in smaller rooms and karlson can hit "decent" (like 125dB) drum peaks - but not w. 2W - more like 200-300W on coax - (5W diy SET ran my edgarhorn 100 system pretty in mids/highs but not so well down low)

Noorloos and Lapaire like horns on top of Karlson K15  - guess I like original concept with  whatever drawbacks  overall.

for plans on net other than Rog's, Walt's Punisher looks like it'd be nice.   Bruce Edgar's "Monolith" with 15" with Q round 0.29, fs ~26 and mms ~98g is strong and clean in-room to 40Hz - a bit of scaling here and there and it might become a "Seismic" (?)

as mentioned on other forum, Fitz's table-tuba looks like potential fun  UCS1 are cheap nuff in US - a compact B6 reflex would probably be cleaner than ucs1 at 30Hz - Best!


Edited by freddyi - 16 November 2005 at 6:08pm
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*MMD View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote *MMD Quote  Post ReplyReply Direct Link To This Post Posted: 16 November 2005 at 8:08pm

If i`m not mistaken those measerments were taken in the place you see in the pictures.

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