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This is the second Archived Forum which was active between 1st March 2012 and 23rd February 2022
Hi everyone,
Does anybody know what the purpose of tilting the BL2 upwards is? Is it tilted up in larger rooms, different placement etc, or is it purely aesthetic?
Thanks!
I've been wondering the same - also, where can I hold of the tool to adjust it?
The old beovox speakers often had a tilt position so that if they were stood on the floor or placed near the floor the sound could be directed slightly upwards towards the listener's sitting position. In the case of a sub woofer though I can't imagine that directing the sound really comes into things and any tilt is just for aesthetic purposes. Maybe to match a pair of tilted BL3’s?
Graham
All you need is a Phillips head screwdriver to loosen the washers underneath the rubber ring. :)
Then it must be purely aesthetic. You'd tilt it back with a BV9 / BV5 and BL4000's and have it straight parallel with AVANTs, BV3s, BL6000's etc
That's my theory, i was just hoping there was a technical reason behind it ;)
Hi.
My experience is that when tilted back the BL2 sounds more tight and less boomy. I think it has to do that the floor do not work as a booster in the same way. So my tip is to try in your room and with your set up and see what suites you the most.
Regards
Kareem
Wilderwein:My experience is that when tilted back the BL2 sounds more tight and less boomy
News to me, any one else done this ?
Wilderwein:My experience is that when tilted back the BL2 sounds more tight and less boomy.
Ok, I suppose this would work if the 'tilt' gave the woofer (and I mean the actual driver) a measurable increase of distance from the floor. However I'm skeptical because the distance gained looks short.
I would imagine the BL2 would see an improvement in clarity if owners would reduce sound reflection from the ground plane.
Beo4 'til I die!
Well... here's where I chime in... LOL
They say that although bass is 'moving air' they also say it's directional - as in the front (active, so to speak) radiator (not as many people as I assume know that the side 'woofers' are actually passive (not connected to anything - just 'blanks' so to speak)) so i'd assume that having the BeoLab 2 pointed upright at a 30-45 degree angle might be beneficial..
However, I've never been able to tell the difference... Personally, I think the BeoLab 2 looks like a Nightclub Doorman laid flat and a Ballerina at a 45 degree angle. In my mind - it's cosmetic.
However, my mind is a can of dog food compared to the Fillet Steak in the head of someone like Geoff Martin - so maybe someone should PM him.
Lee
9 LEE: Well... here's where I chime in... LOL ...............(not as many people as I assume know that the side 'woofers' are actually passive (not connected to anything - just 'blanks' so to speak))...........
...............(not as many people as I assume know that the side 'woofers' are actually passive (not connected to anything - just 'blanks' so to speak))...........
Well that piece of information just completely changed my view of the BL2.
Any other speakers built on the same principle???
If the whole premise of a subwoofer is that it is non-directional, and hence only one is required, then Shirley it's attitude should be irrelevant (looks mean and moody but turns out to be a bit of a wuss)!!
Ban boring signatures!
vikinger: 9 LEE: Well... here's where I chime in... LOL ...............(not as many people as I assume know that the side 'woofers' are actually passive (not connected to anything - just 'blanks' so to speak))........... Well that piece of information just completely changed my view of the BL2. Any other speakers built on the same principle??? Graham
What about thw BL3??
Puncher: What about the BL3??
What about the BL3??
Same... although I'm now assuming you are extracting the urine..
Yes, definitive technology mythos uses the same technology. In that way you can make a small cabinet deliver deeper bass.
Well I suppose the flexible but 'Passive' side dummy speakers do allow just enough air movement within a very small cabinet and damp the opposite phase sound waves from the rear of the speaker.
Seriously.... most people, when i explain, think the side radiators on BL2 and BL3 are active.... promise!
Did you know that ALL tweeters and drivers on the flagship BeoLab 5 are based on the humble CX100 ?
Well... if you knew that, I'd have a week or two on a beach somewhere and hit the "BS" button on your BeoRadar.. LOL Lee
The wavelength of deep bass frequencies is long enough that a speakers performance in those freq ranges is essentially omnidirectional. As freq increases a driver becomes more and more directional, at what freq depends on the size of the driver. Which is why things like the phase link drivers were used, in the transition from a cone woofer to a dome tweeter or mid, there is a discontinuity between the dispersion of the two drivers in the crossover region which shows up as a dip in the power response of the speaker system into the room. Which is where the phase link driver comes in, it fills in a narrow range of freq, about half an octave if I remember correctly, with an intermediate sized driver, to make a more uniform, smooth transition and fill in that dip. Very ahead of the their time in even knowing this was an issue.
So, for a sub tilting the thing should not make any difference, you're talking about a few inches difference for a tens of foot long wavelength.
The two side cones are passive radiators. Their function is the same as the port in a bass reflex cabinet, they mainly output sound around the resonance point, as freq goes down the driver produces less output and the port or radiator more. Below box resonance the system unloads the driver, which is why for smaller drivers in bass reflex cabinets too much bass boost below system resonance will destroy the driver, you can see them flap around in response to bass below system resonance.
You use passive radiators primarily when for the alignment you want standard ports are too big to fit in the cabinet, passives allow you to get a low tuning in a smaller cabinet, without doing something odd like sticking a long port tube outside the cabinet. The main problem with passives is that there is only one possible alignment, whereas for ports there are several, defined by the mathematical high pass filter response of the box/port/driver. The passive one is also not the most well damped one. With modern electronics I think you can alter that if the driver can handle it, you can force Q to whatever you want.
Jeff
I'm afraid I'm recovering from the BeoVirus.
What he said!
The net effect of the passive radiator(s) (or bass reflex tube) is to extend the bass response below that achievable by the driver alone by tuning the resonance of the radiator below that of the driver. Passive radiators are supposedly more difficult to tune than bass reflex ports and both can give a "monotone" bass sound if done incorrectly. A base extension of about an octave is normally achieved although the frequency roll off below the resonant point is steeper. Both methods also give poorer transient response than an equivalent sealed box solution (which would be bigger to achieve the equivalent extended bass response).
For a manufacturer's quick comparison of the different construction methods see HERE.