I'm awaiting my greenish lumber to stop shrinking before making sawdust for this experiment.
I'll be making a stereo pair of fllorstanders, with about 1.6ft3 per Alpair 12PW.
These will be mounted in push pull to on each side of the cabinet, about centred about 55" off the floor.
The outboard magnet will be closest to each sidewall, to somewhat limit high frequency early reflections. The other 12PW will be conventionally mounted.
On the narrow forward baffle will be an isoplanar tweeter, crossed first order around 3000 Hz, shallow slope.
The hope is an asymmetrical near omnidirectional playback, for an immersive soundfield, without a treble that does much more than localize the bipolar off axis sound at the listening position.
I can run with active crossovers for this, but hope to get by with only passive filtering on the tweeter. Active or passive, I'll be using individual amp channels to each driver or driver grouping. (One RT2II, 2 Alpair 12PW per speaker)
I've experimented in the past with extending the lower limit with transmission lines, so the internal height of the cabinet will be the same as the resonat frequency quarterwave or the MarkAudio pairs, but will leave the opening sealed for starters. I've also chosen a cabinet volume easily port tuned for the resonant frequency of 38 hertz, but would prefer sealed.
Anyone seen anything similar I could refer to? They are tall, but take up much less real estate than my current dipole/horn hybrid sub augmented rig.
I'm hoping for accurate, but not ground penetrating bass in my apartment, along with some of the spaciousness I currently get with the oversized system.
I'll be making a stereo pair of fllorstanders, with about 1.6ft3 per Alpair 12PW.
These will be mounted in push pull to on each side of the cabinet, about centred about 55" off the floor.
The outboard magnet will be closest to each sidewall, to somewhat limit high frequency early reflections. The other 12PW will be conventionally mounted.
On the narrow forward baffle will be an isoplanar tweeter, crossed first order around 3000 Hz, shallow slope.
The hope is an asymmetrical near omnidirectional playback, for an immersive soundfield, without a treble that does much more than localize the bipolar off axis sound at the listening position.
I can run with active crossovers for this, but hope to get by with only passive filtering on the tweeter. Active or passive, I'll be using individual amp channels to each driver or driver grouping. (One RT2II, 2 Alpair 12PW per speaker)
I've experimented in the past with extending the lower limit with transmission lines, so the internal height of the cabinet will be the same as the resonat frequency quarterwave or the MarkAudio pairs, but will leave the opening sealed for starters. I've also chosen a cabinet volume easily port tuned for the resonant frequency of 38 hertz, but would prefer sealed.
Anyone seen anything similar I could refer to? They are tall, but take up much less real estate than my current dipole/horn hybrid sub augmented rig.
I'm hoping for accurate, but not ground penetrating bass in my apartment, along with some of the spaciousness I currently get with the oversized system.
Alpair 12P??? The one with the blue cone? I think you were cheated, Mark Audio touts it as a 'novel' seven incher...as I measured it at 185mm total width on my screen, close to the stated 186mm as written in the technical drawings. And with a mere 112mm of radiating diameter, a four point four inches at first approximation...This is not touted as a four-inch, a five inch, not even the obligatory six-and-a-half inch version...you got ripped off. Costs of materials & sugar coating.
------------------------------------------------------------------------------Rick.......
------------------------------------------------------------------------------Rick.......
You're being absurd. Every speaker I've seen, tweeters included, use the overall width of the driver to classify its size.
Not the radiating area.
But thanks for answering zero about the post.
Not the radiating area.
But thanks for answering zero about the post.
Centre to centre of the mounting holes was the way drivers were measured in the old days so this is a 7.25” driver.
Is this kinda like what you had in mind? I really think active cross-overs effectively erase all those phasing issues...a real problem child..
The side-firing driver can be dialed in according to 'sound-stage' preferences.
-----------------------------------------------------------------Rick..........
The side-firing driver can be dialed in according to 'sound-stage' preferences.
-----------------------------------------------------------------Rick..........
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I'd also view the extra woofers from the point of view of baffle step. Have them compensate, and prefer that it happens below that frequency where the drivers start to become more directional on their own than the baffle.
However, if used nonchalantly it can be worse.
They are not 12P. They are 12PW drivers. The idea is one per side, run full range to start with, for a diffuse soundfield, and decent bass from a much smaller speaker due to being a cabinet rather than an open backed baffle, which I have in use now. The tweeter will be to localize each speaker, by being more focussed than the bipolar fullrangers provide.
Near full rangers, I know. They were down about 3db at 15,000 hertz.