nearly ready for Pi speakers in the UK! [message #51608] |
Sat, 15 December 2007 18:44 ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PaulW
Messages: 71 Registered: May 2009 Location: UK
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Hi Wayne, Early this year I discussed here the potential for using your speakers with my Bottlehead Paramours in a dedicated room I was having built. Well its now built ![Photo Sharing and Video Hosting at Photobucket](http://i142.photobucket.com/albums/r81/4will8/GR25a_0212.jpg)
(just decorating to do) unfortunately due to some constraints its ended up a bit smaller than I would have liked. Final dimensions are 17ft 6in(L) x 12ft 4in(W) x 8ft 6in(H) however I've also had a cloakroom installed (for those long listening/movie sessions) which has reduced the length by 3 ft for half the width. ![Photo Sharing and Video Hosting at Photobucket](http://i142.photobucket.com/albums/r81/4will8/GR25b_0212.jpg)
Now initially I was goiing to go for a pair of Stage or Premium 7's (is the only difference here the 15in Killomax driver?) but given the final dimensions of the room could you advise on the suitability of these, or would I be better off going for another model? thanks Paul
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Re: nearly ready for Pi speakers in the UK! [message #51611 is a reply to message #51610] |
Sun, 16 December 2007 13:12 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PaulW
Messages: 71 Registered: May 2009 Location: UK
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Unfortunately the Professional 7's are more than I would be willing to commit to, so its going to have to be Stage or Premium seven's. Would the Kilomax 15 provide better control than the Omega 15 or are there more fundamental differences between the two 7's? Paul.
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looks like its going to be the Stage 7's then... [message #51615 is a reply to message #51613] |
Mon, 17 December 2007 15:38 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
PaulW
Messages: 71 Registered: May 2009 Location: UK
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...as I can't run to the JBL 2226's and only have just over 3 watts on tap, so decision made, I'll be mailing you in the new year about whether to source the larger drivers locally, vs. shipping from the US. Thanks for the help so far - and have a good Christmas and New year. Now back to the decorating ![](http://www.audioroundtable.com/emoticons/frownie.gif) Paul
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Re: nearly ready for Pi speakers in the UK! [message #51616 is a reply to message #51613] |
Mon, 17 December 2007 19:01 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
Chris R.
Messages: 82 Registered: May 2009
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Wayne, Not knocking JBL, but with the corner horns crossing at 200Hz-300Hz, are you into the range where the shorting ring works? I have some JBL music instrument speakers that sound *significantly* better than the Eminence drives I have, and those don't have the shorting rings and what not. JBL really has it going on. Chris
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Cornerhorn woofers [message #51617 is a reply to message #51616] |
Mon, 17 December 2007 21:41 ![Go to previous message Go to previous message](/forum/theme/AudioRoundTable/images/up.png) ![Go to next message Go to next message](/forum/theme/AudioRoundTable/images/down.png) |
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Wayne Parham
Messages: 18693 Registered: January 2001
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JBL takes care to machine the gap so the flux lines are symmetrical around the voice coil. In addition, their older alnico drivers had reduced distortion because alnico resists flux modulation. Their newer drivers with ferrite magnets use shorting rings and boast even lower distortion. Newer still are their woofers with push-pull drive using dual voice coils and they provide even better performance.What I've found is that shorting rings work best as frequency rises. They just don't work well at subwoofer frequencies. Push-pull works better below about 50Hz. I have never seen a woofer with a shorting ring that was effective below 50Hz. Depending on the woofer, some shorting rings don't do much below 100Hz or even 150Hz. But the JBL 22xx series woofers provide reduced distortion starting around 50Hz to 100Hz. With a first-order crossover at 250Hz, there is plenty of overlap between the mid and bass. In this design, it's important to have good clean output from the woofer up through 500Hz or so. That's a decade of output from where the JBL shorting ring starts to work.
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