Setting up to measure my drivers in the cabinet this weekend, and I realized that measuring the midbass drivers gets a bit complicated when there are 2 drivers in a shared internal space.
I have two Satori midbass drivers in a single 50L sealed cabinet. To measure a single driver with an omni microphone and get FRD/ZMA results, how do I capture the actual measurement curve for a single driver when there are typically 2 drivers in that space? Do I need to figure out a way to seal the cavity internally to 25L to simulate what a single driver would see when operating?
I have two Satori midbass drivers in a single 50L sealed cabinet. To measure a single driver with an omni microphone and get FRD/ZMA results, how do I capture the actual measurement curve for a single driver when there are typically 2 drivers in that space? Do I need to figure out a way to seal the cavity internally to 25L to simulate what a single driver would see when operating?
There are probably numerous ways to approach this, from measuring the one in the larger box then measuring both and then splicing them in the low hundreds as is often done.. to going ahead and implementing the 0.5 way cross first then measuring both woofers together.
I guess some of that will come down to your method and your preference. Both could be used in a multi-angle cross but since you're asking about measuring them individually it sounds like you might be following a particular method?
I guess some of that will come down to your method and your preference. Both could be used in a multi-angle cross but since you're asking about measuring them individually it sounds like you might be following a particular method?
Two midbass in a single 50L compartment should behave like each midbass individually in its own 25L compartment right? I think i can create a temporary cover on one of the inside braces that effectively seals it into separate compartments for measurement purposes.
That seems the easiest way to get to FRD & ZMA files from the mic measurement, so I can continue to model and tweak the crossover values in Boxsim and VituixCad.
That seems the easiest way to get to FRD & ZMA files from the mic measurement, so I can continue to model and tweak the crossover values in Boxsim and VituixCad.
You are correct that when playing together, they act the same as if they had separate cabinets.
There are reasons I might not go to the trouble of adding a divider but you can if you want. The cross may not be in the bass region, and due to the room, you'd be splicing anyway...
For impedance you could measure both together and halve it.. unless you want to measure one and ignore the bass region when it's not too close to the cross.
There are reasons I might not go to the trouble of adding a divider but you can if you want. The cross may not be in the bass region, and due to the room, you'd be splicing anyway...
For impedance you could measure both together and halve it.. unless you want to measure one and ignore the bass region when it's not too close to the cross.
So, I cheated.... 😀
Yes, the bass response is exactly like having 1 driver that needs 2x the volume. Here's the cheat: Measure the FRD and ZMA of the two together instead of independently. In your simulation treat them as 1 driver.
Alternatively, measure the ZMA of each independently, but the FRD together and subtract 6db from the FRD.
Yes, the bass response is exactly like having 1 driver that needs 2x the volume. Here's the cheat: Measure the FRD and ZMA of the two together instead of independently. In your simulation treat them as 1 driver.
Alternatively, measure the ZMA of each independently, but the FRD together and subtract 6db from the FRD.