All Eminence OB

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#422
chakija said:


...i know that stock Trends 10.1 can't provide needed gain in bass ,but is there any way to fix that with tweaking it ?
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IMHO, don't even try to squeeze bass out of Trends 10.1. It may make bass on some horn speakers, but certainly not on the OB woofer.
You may keep it for mid/high where it has the most potential, and then use another SS amp for a woofer. Maybe I am repeating myself here, but you really need to try this...

Vix
 
#425
You need something more than a Trends amp (horses for courses) for your bass, but you don't necessarily need a behemoth amp either. In the end, your bass will be x-max limited and not power limited. At 40Hz, you'll be xmax limited to ~90dB@1 m. per speaker for a 15 inch driver, so even if you subtract 12dB for equalization, you won't be calling on your amp to do heroic pro sound duties.
 
#428
Hmmm...i could do that ,but he is from Belgrade 🙁 .As i am coming to Batch for incoming holidays i thought we could arrange some kind of visitation ???I would like to go with Babe straight away ,and though if could buy PCB and some parts first hand&without taxes? 🙂 :angel:

OFF...that pioneer looks like is going to stay at my friend who supposed to fix it.He just like it so much ,and he will pay me 50e if he manage to fix it :xfingers: .
 
#429
pedroskova said:
In the end, your bass will be x-max limited and not power limited.
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Exactly. That's another of the dirty secrets of Open Baffle. And why it's a good idea to get as much displacement as you can - Xmax x Sd.


FWIW - I have often run a modified Trends on my OB rig with preamp OB bass boost (12dB shelving low pass). It works surprisingly well up to a point. As long as levels are modest, no problem. But it won't get really loud without clipping.

Using the Trends to drive the mid/high section with no bass boost is a great idea.
 
#430
chakija said:
Hmmm...i could do that ,but he is from Belgrade 🙁 .As i am coming to Batch for incoming holidays i thought we could arrange some kind of visitation ???I would like to go with Babe straight away ,and though if could buy PCB and some parts first hand&without taxes? 🙂 :angel:

OFF...that pioneer looks like is going to stay at my friend who supposed to fix it.He just like it so much ,and he will pay me 50e if he manage to fix it :xfingers: .
Click to expand...


I told ya that I'll try to help ya whatever I can 😉
 
#431
Many will need to read MJK's OB-bass analysis a little better, especially regarding the Alpha15 and the comparison between Alpha15, Beta15 and Gamma15. It would be easy to build a'Car-Fi' OB by using a given driver and not having advanced equalizing at hand. See the 'New MJK-baffle Article' thread in the Full Range section.

In a Yunick sized baffle Alpha15 will be flat down to 40 Hz and producing 90 dB/1 m/1 watt soundpressure with +- 1 mm cone deflection . I suppose the Alpha15 won't start making bad noises until +-5 mm cone movement even if linear X-max is +- 3.8 mm. The Linkwitz' Excel-simulation, however good, doesn't take floor effects into account and does not discriminate among drivers because of different parameters.

That said 40 Hz in this loudness will be quite sufficient for any music listening and should be produced by any decent amplifier even a 3 watt SE. 😉

/Erling
 
#432
I was a little to quick in my last post. Linkwitz points out that his figures should be 6 dB greater if firing into half-space.

And by the way the Alpha15 will reach a 40 Hz X-max at 10 watts producing around 103 dB +- 3dB /1 m between 40 - 200 Hz if it is not crossed over in that range. In the Yunick baffle !

/Erling
 
#433
skorpion said:
Many will need to read MJK's OB-bass analysis a little better, especially regarding the Alpha15 and the comparison between Alpha15, Beta15 and Gamma15. It would be easy to build a'Car-Fi' OB by using a given driver and not having advanced equalizing at hand. See the 'New MJK-baffle Article' thread in the Full Range section.

In a Yunick sized baffle Alpha15 will be flat down to 40 Hz and producing 90 dB/1 m/1 watt soundpressure with +- 1 mm cone deflection . I suppose the Alpha15 won't start making bad noises until +-5 mm cone movement even if linear X-max is +- 3.8 mm. The Linkwitz' Excel-simulation, however good, doesn't take floor effects into account and does not discriminate among drivers because of different parameters.

That said 40 Hz in this loudness will be quite sufficient for any music listening and should be produced by any decent amplifier even a 3 watt SE. 😉

/Erling
Click to expand...

...just remember not to put on "Dark Side of the Moon" at those levels. 😉 As impressive as the A15's are, and as impressive as MJK's findings are, you can't defeat the laws of physics...and a single Eminence A15 will be xmax limited on a number of recordings(that I own, at least)...YMMV.
 
#435
hello

Hello guys, how are your OBs?

I ordered some mids and am going to go active with digital XO.
http://picasaweb.google.com/michal.hantl/BeyondTheAllEminenceOB

I play with digital bass equalization right now and its awesome🙂. What kinda puzzles me is that there is more bass of axis than in.

The cheapo tesla (TVM) ARO 567 makes a great mid for $7,50 a piece. So i bought 8 of these fullrange drivers and after i get another amp i'm connecting APT80 and going to have active 3way.

Right now i'm playing the activ digital xo 2way and it sounds awesome.
 
#436
Hi there!

It seems that most of us are happy listening to OBs..or not?
Just wanted to ask you what is going on OB-wise..

Chakija, did you manage to fix your OB's ?

Yunick, are you still listening to the same setup? Any changes?

I am listening to my OB's:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=110452&highlight=

they are good but could be better. As I have moved to a smaller apartment , bass has become somewhat overpowering. I'll try to fiddle with the crossover agian (at present: LP 100 Hz, 12 db/oct; HP 200 hz 6 db /oct)

But the best solution seems to be a visit to my local carpenter, and remove those side wings completely...

Regards,

Vix
 
#437
ob

hi there, i'm currently happy (for a few months) with my monsters: http://wiki.hantl.cz/Beyond_The_All_Eminence_OB#V.C3.BDsledek

Vix, move your OB from the wall (looking ant the firts picture in your thread), you are getting huge bass augmentation by having them so close. Find the right distance, some augmentation may be good.

If you had Alpha 15 instead of beta your peak at 40Hz would be smaller and the low end extension better. I simulated both on some simulation xls file and thats the result of comparing beta and alpha with OB close to the wall.

Enjoy your OB, hope everyone else is enjoying their too.
 
#438
Vix said:
Hi there!

It seems that most of us are happy listening to OBs..or not?
Just wanted to ask you what is going on OB-wise..

Chakija, did you manage to fix your OB's ?

Yunick, are you still listening to the same setup? Any changes?

I am listening to my OB's:

http://www.diyaudio.com/forums/showthread.php?s=&threadid=110452&highlight=

they are good but could be better. As I have moved to a smaller apartment , bass has become somewhat overpowering. I'll try to fiddle with the crossover agian (at present: LP 100 Hz, 12 db/oct; HP 200 hz 6 db /oct)

But the best solution seems to be a visit to my local carpenter, and remove those side wings completely...

Regards,

Vix
Click to expand...


you'll understand this :

http://www.hifi-forumi.com/forum/viewtopic.php?p=115056#p115056
 
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