Thank you Scott, that is really useful.
When you say Butterworth, is that system Q approx 0.7 ?
Correct.
Gun to your head Which driver would you choose for rear surrounds in my situation ?
To be honest, I haven't been reading in depth, just noticed the last couple of posts. It depends what it is you're wanting specifically to do / what you're after from your rear channels -system, room size &c. For HT, on principle I would favour the largest quality speaker I could get away with, but then, I'm a brontosaurus, and rear channels are usually a bit less critical than fronts as they tend to receive a narrower BW. Dispersion is important, as Stefan says, especially if those rears are actually going to be plonked behind you, since human hearing is lousy at picking up directional cues behind the skull. That's one reason, amongst many, that a lot of the 1970s era quadraphonic systems didn't work too well, and why ideally the rear channels in, say, a 4 or 5 channel setup are IMO better placed to the side, about 10 degrees behind your ears. YMMV. Be that as it may (although not all agree and I can hear the lynching mob galloping over the prairie as I type) if it's a small system & you're unlikely to crank it to very high levels, then the 7MS as Stefan suggests, should do OK for rears, especially if your reciever has the option of protecting the drivers from any excess LF. Pluvia 7HD (new one) for a tighter budget. If you want something with a bit more power-handling then the Pluvia 11, although you might find with that unit, a lateral position is increasingly beneficial as it doesn't have the same level of off-axis output.
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Check out the plans on Madisound for the pluvia 7's, we use the 11l sealed one for the Alpair 7.3 and it works really well. It says the dims and literage.
Markaudio Alpair-7 Gold Cone 4" Full Range
Thank you Timbre, I’ll check that out
Correct.
To be honest, I haven't been reading in depth, just noticed the last couple of posts. It depends what it is you're wanting specifically to do / what you're after from your rear channels -system, room size &c. For HT, on principle I would favour the largest quality speaker I could get away with, but then, I'm a brontosaurus, and rear channels are usually a bit less critical than fronts as they tend to receive a narrower BW. Dispersion is important, as Stefan says, especially if those rears are actually going to be plonked behind you, since human hearing is lousy at picking up directional cues behind the skull. That's one reason, amongst many, that a lot of the 1970s era quadraphonic systems didn't work too well, and why ideally the rear channels in, say, a 4 or 5 channel setup are IMO better placed to the side, about 10 degrees behind your ears. YMMV. Be that as it may (although not all agree and I can hear the lynching mob galloping over the prairie as I type) if it's a small system & you're unlikely to crank it to very high levels, then the 7MS as Stefan suggests, should do OK for rears, especially if your reciever has the option of protecting the drivers from any excess LF. Pluvia 7HD (new one) for a tighter budget. If you want something with a bit more power-handling then the Pluvia 11, although you might find with that unit, a lateral position is increasingly beneficial as it doesn't have the same level of off-axis output.
Cheers Scott,
Loving the brontosaurus reference & yeah, I’m a bit of a dinosaur myself
I agree about the surrounds being more to the sides & I have always previously used Di/Bi pole surrounds in that position. I like to listen quite loud but yes, they’ll be bass managed in the av receiver.
I’m also planning to add surround backs in the near future & hence the switch to direct radiating speakers for the full Dolby Atmos experience.
Unless you play really loud A7ms, P7HD, P7, even A6m or A5.2.
Chris has a mix of A10.3eN up front, A5.2eN in back, P7eN for atmos.
dave
Thanks Dave,
I really appreciate the input from all of you guys.
I do listen loud, not quite at Cinema reference levels these days but often -5db master volume.
I’m sure the 7’s would be fine, they are only 6feet from the main listening position & I know lots of people run them full range as main speakers.
I’d love to hear a pair of eN A11MS against a standard pair, I love mine & I’d be extremely impressed if their performance could be further improved.
Alpair Ms jigs
I have been swaying away from CNCing cabinets mainly due to the cost and the pain of logistics. So I am CNCing some jigs instead.
So for me and if anyone else wants some I have made a really simple jig for routing the new rebate and cut through for the ms series. This allows for our super open back design with much less material that a simple hole to disturb the rear sound wave. Pilots holes for the driver in there too.
One for 7ms & 11ms. The small holes on the outside will be cut half way through when the shape is cut out, which should provide a nice easy way of centering the jig to pencil lines on the baffle, and to re-centre the jig for the second cut.
From 12mm Birch ply.
£25 + shipping. I should have a few in the next week/two.
Dm if anyone is interested.
I have been swaying away from CNCing cabinets mainly due to the cost and the pain of logistics. So I am CNCing some jigs instead.
So for me and if anyone else wants some I have made a really simple jig for routing the new rebate and cut through for the ms series. This allows for our super open back design with much less material that a simple hole to disturb the rear sound wave. Pilots holes for the driver in there too.
One for 7ms & 11ms. The small holes on the outside will be cut half way through when the shape is cut out, which should provide a nice easy way of centering the jig to pencil lines on the baffle, and to re-centre the jig for the second cut.
From 12mm Birch ply.
£25 + shipping. I should have a few in the next week/two.
Dm if anyone is interested.
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From an aesthetics point of view, it would grind my gears to have different cone colours. So for that reason alone I would probably stick to one MA sub-brand
Ha ha, yes, I do get that & it would be lovely to go with the A11ms all around for aesthetic & sonic reasons, I will probably make grills for them eventually though, I like the piano string effect used by Steinway Lyngdorf.
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Yeah, it's nice to see the drivers. Markaudio Sota's designer Andrea Ponti did similar with very sheer material for the Viotti series
Ooh, I like that look too, I think the metal MA cones look cool (especially the curvy MS cones) & it would be a shame to completely cover them.
Do you know what that material is (or similar) ?
...for routing the new rebate and cut through for the ms series...
Is the shelf for holding the driver wide enuff so that both of the ribs in the super gasket are supported?
dave
After thinking long & hard which route to take for my surround speakers, I ended up going for the Pluvia 11 & when funds allow, I’ll demote them from side surround to back surround duty & go with another pair of A11MS for sides.
Arrived in perfect condition, big thanks to KJFaudio & all who shared their very valuable experience/expertise
Arrived in perfect condition, big thanks to KJFaudio & all who shared their very valuable experience/expertise
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They've the same features as Dave describes, at least on the 7MS which I took a pic of.I haven’t looked at the gaskets on the new MS drivers, but all the old (larger) Alpairs had a sealing gasket with 2 rings of bump (like the seal that failed on the Space Shuttle booster). Both need to be loaded against the mounting shelf.
dave
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Jason,
Nice looking drivers those. Tell us more once you've got them up and running. And any build pics are welcome too. Have fun!
Project Pluvia 11 side surrounds ready for paint
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Project Pluvia 11 side surrounds ready for paint
Don't forget to chamfer the insides of the driver mounting holes.
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