Hi,
A speaker demo popped up in my YT short feed.
It was a Storgaard&Vestskov FENJA 3 way. (See: https://www.sv-audio.com/fenja-3way-floorstanding-speaker/)
The speaker looks like its 3 separate cabinets (Mid/Tweeter, 2 Woofers, 2 Woofers) And on the back, the two sets of woofers have 3 ports.
(The tweeter/mid cabinet has 1 port and a rear facing tweeter)
So my newbie question... w 3 ports... how do you model it? Would they have different length tubes for different frequency tuning?
What's the logic behind it?
Just trying to do a mental exercise of reverse engineering their speaker.
Thx
A speaker demo popped up in my YT short feed.
It was a Storgaard&Vestskov FENJA 3 way. (See: https://www.sv-audio.com/fenja-3way-floorstanding-speaker/)
The speaker looks like its 3 separate cabinets (Mid/Tweeter, 2 Woofers, 2 Woofers) And on the back, the two sets of woofers have 3 ports.
(The tweeter/mid cabinet has 1 port and a rear facing tweeter)
So my newbie question... w 3 ports... how do you model it? Would they have different length tubes for different frequency tuning?
What's the logic behind it?
Just trying to do a mental exercise of reverse engineering their speaker.
Thx
Thanks for the response.
IIRC the Mon speakers had two ports of different lengths which I thought interesting.
So essentially you're taking the volume of the port across 3 holes but the total volume will dictate that box's resonance.
Cool. That makes sense.
IIRC the Mon speakers had two ports of different lengths which I thought interesting.
So essentially you're taking the volume of the port across 3 holes but the total volume will dictate that box's resonance.
Cool. That makes sense.
Correct likely 3 separate compartments
1 for midrange with single port.
4 woofers
2 share same compartment. 2 separate compartments
3 ports each.
Calculating 3 ports is same as calculating any multi port vented
enclosure.
A port is essentially a velocity ramp.
So if velocity is too high, the port makes noise or chuffing
if too small.
This case or many cases you use multiple ports to make
the overall port area large enough to keep velocity low enough.
Ideal max port velocity is 18 to 25 m/s
and with " audiophiles" most of them will scream and whine
if you go over 18 m/s and is subjective.
As with any port system they are more likely to be fine
under high velocity if flared. Usually one end flared
or dual flared ends.
The design you have shown has 2 ports towards the bottom of the compartment
and a single port towards the top. Has been used in live audio or very high thermal/heat
situations. They operate as normal ports but they also help reduce heat in the box
with typical heat goes= up theory. Cool air from bottom, hot air goes up.
Its typical for normal vented to do this anyways, Since sealed boxes retain more heat.
With 4 woofers as shown, center to center spacing is very tall for lower and upper woofers.
Would cause a lot of vertical cancellation. Highly likely the lower woofers are on a lower
crossover point. than the upper 2 woofers to fix a stupid design that uses small woofers
when one or 2 large ones will do the same thing.
The lower crossover point for the lower woofers helps to fill in baffle step losses
from full space radiation.
1 for midrange with single port.
4 woofers
2 share same compartment. 2 separate compartments
3 ports each.
Calculating 3 ports is same as calculating any multi port vented
enclosure.
A port is essentially a velocity ramp.
So if velocity is too high, the port makes noise or chuffing
if too small.
This case or many cases you use multiple ports to make
the overall port area large enough to keep velocity low enough.
Ideal max port velocity is 18 to 25 m/s
and with " audiophiles" most of them will scream and whine
if you go over 18 m/s and is subjective.
As with any port system they are more likely to be fine
under high velocity if flared. Usually one end flared
or dual flared ends.
The design you have shown has 2 ports towards the bottom of the compartment
and a single port towards the top. Has been used in live audio or very high thermal/heat
situations. They operate as normal ports but they also help reduce heat in the box
with typical heat goes= up theory. Cool air from bottom, hot air goes up.
Its typical for normal vented to do this anyways, Since sealed boxes retain more heat.
With 4 woofers as shown, center to center spacing is very tall for lower and upper woofers.
Would cause a lot of vertical cancellation. Highly likely the lower woofers are on a lower
crossover point. than the upper 2 woofers to fix a stupid design that uses small woofers
when one or 2 large ones will do the same thing.
The lower crossover point for the lower woofers helps to fill in baffle step losses
from full space radiation.
