Hello,
Just asking advice on speaker cabinet for Mark Audio Alpair 12 drivers.
My idea is to build simple vented large standmount speakers. I am thinking 38cm (15") D x 42cm (16.5") W x 75cm (29.5") H in dimension.
I guess that it is not the right way to build cabinet by determining size first then find a matching drivers and wondering how the sound would be like if those drivers onto this sized speaker cabinet.
I checked recommended cabinet design from MarkAudio Website and they are either tall narrow (pencil design) or compact bookshelf type of speaker cabinets.
I believe that there are speaker cabinet design software to simulate based on the cabinet volume and anyone can enlighten me what would sound like if those drivers are in the specific cabinet size?
Thank you very much in advance.
Just asking advice on speaker cabinet for Mark Audio Alpair 12 drivers.
My idea is to build simple vented large standmount speakers. I am thinking 38cm (15") D x 42cm (16.5") W x 75cm (29.5") H in dimension.
I guess that it is not the right way to build cabinet by determining size first then find a matching drivers and wondering how the sound would be like if those drivers onto this sized speaker cabinet.
I checked recommended cabinet design from MarkAudio Website and they are either tall narrow (pencil design) or compact bookshelf type of speaker cabinets.
I believe that there are speaker cabinet design software to simulate based on the cabinet volume and anyone can enlighten me what would sound like if those drivers are in the specific cabinet size?
Thank you very much in advance.
About 18.5 litres gross internal volume. That works. Scott’s basic vented box is about that size/volume.
A Pensil is an ML-TL, not a vented box.
dave
Assuming these specs and minimal series resistance (Rs):
T/S max flat alignment:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3 = 22.865 L
L(Ft^3 = (Vb)/~28.31685)
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96 = 50.87 Hz
F3 (Hz) = Fs*0.28*Qts'^-1.4 = 55.02 Hz
(Qts'): (Qts) + any added series resistance (Rs)
Assuming your cab dims are o.d. with ~18 mm panels, then i.d. = 13.5" x 15" x 28" = 5670"^3/1728 = ~3.281 ft^3/92.915 L or 4+ X bigger - some bracing = severely under-damped = heavily stuffed
T/S max flat alignment:
Vented net volume (Vb) (L) = 20*Vas*Qts'^3.3 = 22.865 L
L(Ft^3 = (Vb)/~28.31685)
Vented box tuning (Fb) (Hz) = 0.42*Fs*Qts'^-0.96 = 50.87 Hz
F3 (Hz) = Fs*0.28*Qts'^-1.4 = 55.02 Hz
(Qts'): (Qts) + any added series resistance (Rs)
Assuming your cab dims are o.d. with ~18 mm panels, then i.d. = 13.5" x 15" x 28" = 5670"^3/1728 = ~3.281 ft^3/92.915 L or 4+ X bigger - some bracing = severely under-damped = heavily stuffed
Bit of a primitive suggestion, but if you need to have an enclosure of that size, you could also looking at adding in some blocks of wood to reduce the size by a few litres if required. Or an extra panel to divide a few litres of the box off.
Reducing the net internal volume with random blocks / wedges of wood can also mitigate internal standing waves.
Here are the predicted vented (green) and sealed (blue) alignments. The vented alignment is based on @GM's numbers. The blue sealed alignment is pretty close to max flat (.7) with the Vb around 8.5 litres.
jeff
You're welcome! Flip a coin
Think in terms of a driver's impulse on this acoustically dense column as like you quick jabbing a big stuffed punching bag Vs one that will displace a tiny amount of air through a flapper valve and how likely you're going to feel the difference on impact.As has been noted, if wanting the cab size for a specific reason such as a wide baffle to cope with BSC and vented, then line it full length vertically with Styrofoam or preferably something massive if the weight isn't a problem to get the desired net Vb and tune the vent accordingly, then critically damp it for the best overall performance.