I have a pair of B&O CX50 speakers. The woofer has been replaced with one of these The speakers have a great mid/hi, but the bass is very, very dull. Now I was wondering if adding bass reflex port would do it any good, and if so, what Fb to tune for to get a feel of some better lows?
The internal size of the cabinet is around 3,4 Liters. I was thinking about a 2,5cm bass port. I did some calculations using this spread sheet but I don't know if I'm off?
My experience with acoustics is very limited so any advice is highly appreciated before I start drilling holes in my old vintage speakers.
The internal size of the cabinet is around 3,4 Liters. I was thinking about a 2,5cm bass port. I did some calculations using this spread sheet but I don't know if I'm off?
My experience with acoustics is very limited so any advice is highly appreciated before I start drilling holes in my old vintage speakers.
Well, as your sims show it's (very) under-damped due to high Qts' = 0.6845, so not considered a good plan.
Anyway for a T/S max flat alignment Fb = 0.42*Fs*Qts'^-0.96 = ~45 Hz, but is based on the box Vb = 20*Vas*Qts'^3.3 = 22.9 L, so the lowest in theory, though experiment in-between ~45 - 74 Hz for flattest response.
Another option would be mean and critically damp the vent = sqrt(45*74) = ~58 Hz
[Qts']: [Qts] + any added series resistance [Rs]: http://www.mh-audio.nl/Calculators/newqts.html
Anyway for a T/S max flat alignment Fb = 0.42*Fs*Qts'^-0.96 = ~45 Hz, but is based on the box Vb = 20*Vas*Qts'^3.3 = 22.9 L, so the lowest in theory, though experiment in-between ~45 - 74 Hz for flattest response.
Another option would be mean and critically damp the vent = sqrt(45*74) = ~58 Hz
[Qts']: [Qts] + any added series resistance [Rs]: http://www.mh-audio.nl/Calculators/newqts.html
Hello,
I am studying the solution to use this housing for enhance bass onCX100 setup.
Maybe a solution is to replace the top driver by a subwoofer, if findable in 4"
I am studying the solution to use this housing for enhance bass onCX100 setup.
Maybe a solution is to replace the top driver by a subwoofer, if findable in 4"
Yes, something like the KArtesian Sub 120, which can go till 2500 Hz!
But the problem is the enclosure, that will make pass trough the vibrations induced by the sound pressure inside.
Not to mention the enclosure materials and construction, as I see from the pics.
To obtain bass from little drivers the execution must be particularly careful... (< nonsense!)
The crossover needs attention too, as you'll likely turn up the volume and a tweeter crossed with a cap would collapse easily; the mid-woofer will start to scream, either, if not well filtered.
But the problem is the enclosure, that will make pass trough the vibrations induced by the sound pressure inside.
Not to mention the enclosure materials and construction, as I see from the pics.
To obtain bass from little drivers the execution must be particularly careful... (< nonsense!)
The crossover needs attention too, as you'll likely turn up the volume and a tweeter crossed with a cap would collapse easily; the mid-woofer will start to scream, either, if not well filtered.