I have four 4 ohm, 40 mm drivers I wish to use to make two vented enclosures for 200 Hz up (flat above 200, hopefully). Each enclosure would have 2 drivers plus a tweeter.
However, these four drivers are two separate pairs, and they're slightly distinct, one pair having higher Fs and lower Vas than the other, but the rest of the parameters (like Xmax, DC resistance etc) being much more similar.
I already have an amplifier to use with them, but it can only use loads down to 4 ohm (at least in principle). So I should wire them in series.
And, if I want the left and right side enclosures to sound the same, I should, in principle, use one of each pair in each side, so each side would have 2 dissimilar drivers.
But coming to think about it, I think this would probably not be a good idea either.
To begin with, even if I made a separate cavity with its own vent for each driver, the fact they're in series is still a complication. They have different impedance curves, and I can't simulate each driver as if it were in series with a simple resistance, it's in series with another driver, that's not mechanically coupled to it anyhow.
And WinISD at least can't simulate that.
I thought for one second about measuring the TS parameters of them in series like they were a single driver, until I realized this would only make sense if their cones were also mechanically tied together, always moving as a single thing.
Maybe, then I should make each side using one pair, and just try and tune them to be the most similar as possible? Their phase response isn't going to be the same though.
Plus, a small question: Do you know if, when using more than 1 driver in a WinSD project, it considers they're in series or parallel? There isn't an option for that, that "voice coil connection" option is for drivers with a segmented voice coil, not for the connection between the drivers. I'd assume it considers they're in parallel.
If it considers they're in parallel, it's a further complication, as, in the case of using one pair in each side, I'd still like to wire them in series.
What would be the best way to go about this?
Thanks!
However, these four drivers are two separate pairs, and they're slightly distinct, one pair having higher Fs and lower Vas than the other, but the rest of the parameters (like Xmax, DC resistance etc) being much more similar.
I already have an amplifier to use with them, but it can only use loads down to 4 ohm (at least in principle). So I should wire them in series.
And, if I want the left and right side enclosures to sound the same, I should, in principle, use one of each pair in each side, so each side would have 2 dissimilar drivers.
But coming to think about it, I think this would probably not be a good idea either.
To begin with, even if I made a separate cavity with its own vent for each driver, the fact they're in series is still a complication. They have different impedance curves, and I can't simulate each driver as if it were in series with a simple resistance, it's in series with another driver, that's not mechanically coupled to it anyhow.
And WinISD at least can't simulate that.
I thought for one second about measuring the TS parameters of them in series like they were a single driver, until I realized this would only make sense if their cones were also mechanically tied together, always moving as a single thing.
Maybe, then I should make each side using one pair, and just try and tune them to be the most similar as possible? Their phase response isn't going to be the same though.
Plus, a small question: Do you know if, when using more than 1 driver in a WinSD project, it considers they're in series or parallel? There isn't an option for that, that "voice coil connection" option is for drivers with a segmented voice coil, not for the connection between the drivers. I'd assume it considers they're in parallel.
If it considers they're in parallel, it's a further complication, as, in the case of using one pair in each side, I'd still like to wire them in series.
What would be the best way to go about this?
Thanks!
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I know of no way to mix two drivers with probably different sensitivities and other measures in the same space. The best I can think of is that you could do something like a 2.5 way design, perhaps porting whichever one has the lowest Fs, assuming they were both suitable. However, since porting also takes up a lot of space, you might want to consider them in 2 sealed compartments.
No, two pairs of basically full-range speakers (plus 2 tweeters). They're from two different passive radiator Bluetooth enclosures from Anker.
D
Deleted member 375592
I concur with Erik. While looking for "perfect" budget drivers, I collected a lot of drivers. Now, I use 8Ohm Audax 130Z10 (92 dB SPL) with 2 HiVi D5.4 (91 dB and 4Ohm each) in series but in separate boxes (line array). Unexpectedly, distortions dropped ~5dB. You may try WinISD to find the 2 box volumes so that 2 spks have similar FRs.
for 200HZ up, you're probably best to stick with a sealed enclosure.
re:'way to mix two drivers' - this article includes a method for working out combined TSPs:
https://thunderstone_audio.fortunecity.ws/theory/dddllqd/dddllqd.html
(it works, I've done it)
re:'way to mix two drivers' - this article includes a method for working out combined TSPs:
https://thunderstone_audio.fortunecity.ws/theory/dddllqd/dddllqd.html
(it works, I've done it)
I would up-fire vented the one more suited for bass, and front-fire sealed/nude the other, placed over the up-fire cone to strengthen natural attenuation above 1khz. Tweeter on top if needed. LX.
40mm! That’s tiny. What I would do is make the individual bass boxes. Sealed would be easier to integrate. Then cross out the one with the worst or less desirable midrange somewhere around 300hz, then add your tweeter. This way the two woofers wouldn’t be producing interfering midrange information and the woofers would share the bass duties, one woofer would support the mids and then add your tweeter on top.