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Old 30th October 2011, 02:26 PM   #1
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Default How to get the best bass reproduction ?

The weakest link of my audio system today is bass reproduction. It has very positive aspects, as sounding tight and clean. BUT.....
It is directional, and is not well integrated. It sounds actually disconnected from the main horn towers. Beside this, while my main towers do emanate sound from 1,7m height vertically to the floor, which i very much like, the bass horn is only 1,1m high, and emanates sound only from this vertical size. I would like to emanate at least bass from the same high level, down, as the main horn towers.
There are different methods. the easyest for me would be to build a second, identical bass horn, and place it above the first bass horn. But i am thinking if i might find other configurations, which eventually will work better. Direct radiator and bass reflex line array , open baffle, TH, etc. i would like to know ideas, which could result in my next improvement of my system in the bass region. What eventually could work best ? Any suggestion ?

Angelo
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Old 30th October 2011, 03:19 PM   #2
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If you are finding the bass directional, could it be that the horn woofers are crossed too high?
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Old 30th October 2011, 04:26 PM   #3
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Sounds like you need a mouth diffraction plug same as when using down-firing.

GM
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Old 30th October 2011, 04:51 PM   #4
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Quote:
Originally Posted by Cal Weldon View Post
If you are finding the bass directional, could it be that the horn woofers are crossed too high?

they are crossed at 150hz
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Old 30th October 2011, 05:08 PM   #5
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For many years, I crossed over at 140 Hz 24dB/8ave to a single corner horn. Despite what others say, I assure you there was no sense what so ever of the woofer location on any content I can recall. Moreover, the woofer location was often meters from the rest of the system and easily detected if there were directional effects.

I now cross-over around 110 Hz. Not because of directional effects but because I finally have enough horsepower to drive my Dayton-Wright ESLs lower.

Having a mixed-bass sub is a good idea too. And esp. when you have two or more subs in diversity installation to address room influences.

Ben
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Old 30th October 2011, 08:16 PM   #6
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Bad time alignment can also cause a directional cue and disconnected sense.
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Old 30th October 2011, 08:47 PM   #7
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Quote:
Originally Posted by angeloitacare View Post
they are crossed at 150hz
What's the slope? 150 Hz is high-ish if the slope is not steep; possibly OK if it's 24 db/octave (although I would go a bit lower than 150 Hz/24dB myself).
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Old 30th October 2011, 08:49 PM   #8
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Hi, the shortest answer to the original question is "know your onions", rgds, sreten.
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Old 30th October 2011, 09:25 PM   #9
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Quote:
Originally Posted by Johnny2Bad View Post
What's the slope? 150 Hz is high-ish if the slope is not steep; possibly OK if it's 24 db/octave (although I would go a bit lower than 150 Hz/24dB myself).
my active crossover has 24db slope. I am looking to try out maibe something different, than i was accostumed to hear until now. For example a dipole line array with H frame, or something as proposed recently by Nelson Pass.....i guess it was ripole, or so....
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Old 30th October 2011, 09:27 PM   #10
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Originally Posted by revboden View Post
Bad time alignment can also cause a directional cue and disconnected sense.
I can promise you that my system had terrible time alignment yet no directional cues or disconnected sense what so ever. While that's nothing but my admittedly biased perception, I think over dozens of years I or visitors just might have noticed (including times when I was inclined to puzzle my visitors).

It is a common error to note a perturbation of sound which is profoundly evident in theory and on charts and wave traces and think it must be audible. I'd put a large part of talk about hearing phase in that category.

Haas Effect is strong.

BTW, I agree that anything less sharp than 140 Hz and 24dB/8ave likely would be audible, as the math clearly suggests.

On the other hand, my brain does not seem too good at localizing a pure 140 Hz tone in my room, with no help from the Haas Effect, whatever the textbooks say.

Ben
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Last edited by bentoronto; 30th October 2011 at 09:36 PM.
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