I never see us parting 
I have almost finished putting together my all sealed system. At least I can say I have it somewhere I really like it. 2x 3ways with 8 inch drivers and 2x 8 inch subs, all sealed. When the sound gets you the chills its usually a good indication your personal quest made a move in the right direction. I guess thats what its all about. Where to go next. I decided to add 2 more sealed subs so that I can try one in each corner, and the + configuration. Im guessing the corners might offer better imaging effects because I wire them L and R the stereo is main purpose is music.
I have almost finished putting together my all sealed system. At least I can say I have it somewhere I really like it. 2x 3ways with 8 inch drivers and 2x 8 inch subs, all sealed. When the sound gets you the chills its usually a good indication your personal quest made a move in the right direction. I guess thats what its all about. Where to go next. I decided to add 2 more sealed subs so that I can try one in each corner, and the + configuration. Im guessing the corners might offer better imaging effects because I wire them L and R the stereo is main purpose is music.
funny
nah
if it is superiour it is only because the system only consist of clean predictable air, and no other strange less predictable system playing along
Closed box is a flippin' nightmare on cabinet construction. It does tend to rattle a box most unpleasantly.
But it has "Timing" on the bass. You will tap your feet to the good rythym of closed box.
Reflex is not so good in that respect. There are technical reasons why the higher order bass of reflex introduces delay. The fact is that reflex bass lags the main signal. So your poor little feet get confused.
Plus closed box goes deeper. So if your room acoustics are big and good, you get a good deep sound.
Trouble is, most bass drivers these days are designed for reflex. It's easier to do reflex cheap. A good closed box gets quite elaborate on bracing and damping. Think B&W matrix cabinets for instance.
But I agree, closed box is more satisfying really.
But it has "Timing" on the bass. You will tap your feet to the good rythym of closed box.
Reflex is not so good in that respect. There are technical reasons why the higher order bass of reflex introduces delay. The fact is that reflex bass lags the main signal. So your poor little feet get confused.
Plus closed box goes deeper. So if your room acoustics are big and good, you get a good deep sound.
Trouble is, most bass drivers these days are designed for reflex. It's easier to do reflex cheap. A good closed box gets quite elaborate on bracing and damping. Think B&W matrix cabinets for instance.
But I agree, closed box is more satisfying really.
Because it is not so easy to build a small reflex-box that is tuned low. One will actually end up with a long an narrow tunnel.
By using specialised drivers (i.e. specilly designed with the appropriate TS parameters) that go low in a small closed-box one will have very low efficiency though, which is then made up by the use of a strong amp.
And don't forget: Some of them just look like closed boxes but they are in fact reflex boxes using passive radiators.
Regards
Charles
By using specialised drivers (i.e. specilly designed with the appropriate TS parameters) that go low in a small closed-box one will have very low efficiency though, which is then made up by the use of a strong amp.
And don't forget: Some of them just look like closed boxes but they are in fact reflex boxes using passive radiators.
Regards
Charles
Hmmm, Closed minds or closed boxes ? ...
funny, though I have no clew what it means
but my 1. thought was, ported always seems to be 1. choice, without thinking twice about it
I have two similar sized speakers with 8" bass, one reflex, one closed box. The closed box is just more natural in an AB comparison.
The theory looks like this:
Though it's actually a bit more complex because the drivers have different properties. Generally the closed box driver has a smaller magnet and higher Qts.
You can tune closed box just like you do reflex, and the middle ground is the damped aperiodic box.
A complex business, but I suppose the bottom line is that reflex gives you an extra octave of slow bass at some cost in harder amplifier drive requirement and the loss of the very deepest bass.
Curiously, you can do reflex with drivers that seem to say closed box from their Qts. Here 0.52:
http://www.visaton.de/en/chassis_zubehoer/tiefton/w170s_8.html
The theory looks like this:
An externally hosted image should be here but it was not working when we last tested it.
Though it's actually a bit more complex because the drivers have different properties. Generally the closed box driver has a smaller magnet and higher Qts.
You can tune closed box just like you do reflex, and the middle ground is the damped aperiodic box.
A complex business, but I suppose the bottom line is that reflex gives you an extra octave of slow bass at some cost in harder amplifier drive requirement and the loss of the very deepest bass.
Curiously, you can do reflex with drivers that seem to say closed box from their Qts. Here 0.52:
http://www.visaton.de/en/chassis_zubehoer/tiefton/w170s_8.html
from my own and few experience I agree with you system7 : the lower slope for low end, the more natural at home for me. I have two pass band closed box speakers for bass at home ! In the absolute, just with my two cents experience, the best for me would be a sealed box for the two or three first octaves, then A VOTT (first) or OB or cardioid, or ported or even closed (what you want if issues with matching the two design are possible in domestical rooms)
And with greater surface area, you need less excursion, keeping more of the voice coil in the linear region of the gap. And you want good efficiency too to reduce thermal compression.
se
I have two similar sized speakers with 8" bass, one reflex, one closed box. The closed box is just more natural in an AB comparison.
The theory looks like this:
An externally hosted image should be here but it was not working when we last tested it.
Though it's actually a bit more complex because the drivers have different properties. Generally the closed box driver has a smaller magnet and higher Qts.
You can tune closed box just like you do reflex, and the middle ground is the damped aperiodic box.
A complex business, but I suppose the bottom line is that reflex gives you an extra octave of slow bass at some cost in harder amplifier drive requirement and the loss of the very deepest bass.
Curiously, you can do reflex with drivers that seem to say closed box from their Qts. Here 0.52:
W 170 S - 8 Ohm
Thats a poorly done reflex system, best not to compare in a vacuum.
When choosing what topology to use , its a horse for course's type of situation, the driver choosen decides whats best and of course your design criteria on the total project. You will easily need to double driver surface area sealed to get anywhere better than one vented. Agree also on surface area vs xmax , that long throw woofer , will have timing issues at full extension , output may match but not the sound ....
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