The MarkAudio store in Taobao (Chinese eBay) also sells finished speakers, or I assume they are at least affiliated with MarkAudio. The external dimension is given as 380*255*260mm. It claims bass response down to 27Hz. I’ve read that the 12P really needs a big enclosure.
I use a subwoofer with bookshelf speakers, which typically have respectable performance down to about 40Hz these days. Do you think an Alpair 12P with a ported enclosure of this size can match them? If not how low should I expect?
That said I am more concerned about mid bass quantity than absolute bass extension, since I use a subwoofer and I don’t like thin midrange.
I am considering if I should go with these or go with a custom enclosure. I am also not sure if I want to go Pensil. I kinda prefer stand mount speakers, sealed or ported. I sit about 2 meters plus away from the speakers.
I am also wondering if the 12P are tube friendly. My Tang Band W5-2143 don’t like my EL34 push pull amp with global negative feedback. They simply sound smoother and better extended on both ends with solid state amps. I read that they are designed for tubes but would like to hear first hand experiences.
Well, you could say that about pretty much any speaker, just how far down are they at that point. -20, -30db?
Edit: So in a 20 litre BR box, the predicted QB3 response is -26db @ 27Hz.
They sound great with both tubes and SS. My daily amp is a Pete Millett DCPP.
jeff
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Navyblue,
With wall thickness of 18mm, a box of those external dimensions would give an internal volume of just under 17 liters. The port and bracing (if any) will take up a little volume also, leaving the net volume slightly lower.
I've listened to the Alpair 12P in a bookshelf of ~16 liters. With the Super Pensil, the bass extension and weight both are greater. If I am not wrong the Super Pensil for the Alpair 12P has a tuning of around 45 Hz?
My guess would be that for small cabinet, a Pluvia 7 can be tuned to around 45 Hz? Maybe Dave or Dr. Lindgren (Scottmoose) will be able to confirm?
If you want more bass in a compact cabinet, a good 2 speaker is likely to do better, especially when you crank up the volume a bit. That has been my experience. The build is more involved, since there is a crossover, and I found there are differences in presentation.
With wall thickness of 18mm, a box of those external dimensions would give an internal volume of just under 17 liters. The port and bracing (if any) will take up a little volume also, leaving the net volume slightly lower.
I've listened to the Alpair 12P in a bookshelf of ~16 liters. With the Super Pensil, the bass extension and weight both are greater. If I am not wrong the Super Pensil for the Alpair 12P has a tuning of around 45 Hz?
My guess would be that for small cabinet, a Pluvia 7 can be tuned to around 45 Hz? Maybe Dave or Dr. Lindgren (Scottmoose) will be able to confirm?
If you want more bass in a compact cabinet, a good 2 speaker is likely to do better, especially when you crank up the volume a bit. That has been my experience. The build is more involved, since there is a crossover, and I found there are differences in presentation.
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The A12p fits optimally in a 17 litre enclosure. It has an estimated F10 of 50 Hz anechoic.
Joan should get near an octave lower. Pensils just a bit higher.
You have to be careful, Mark has released some OK, but not great reflexes. For a standard style, Dr Scott’s work is where i would start.
27 Hz is gonna need something like Joan and help from the room (a given).
But getting a decently built box with the right rebate is a start. You can start by trying it and then making it better. The ones pictured look to use decent plywood, from the external dimensions, just under 17 litres less braces (if any), and the vent. The back side of the cutout would need checking, chamfering that creats just about the same volume as the back of the driver takes up in the cabinet. Then one would make sure damping & tuning are appropriate.
Link to where they are sold?
dave
Joan should get near an octave lower. Pensils just a bit higher.
You have to be careful, Mark has released some OK, but not great reflexes. For a standard style, Dr Scott’s work is where i would start.
27 Hz is gonna need something like Joan and help from the room (a given).
But getting a decently built box with the right rebate is a start. You can start by trying it and then making it better. The ones pictured look to use decent plywood, from the external dimensions, just under 17 litres less braces (if any), and the vent. The back side of the cutout would need checking, chamfering that creats just about the same volume as the back of the driver takes up in the cabinet. Then one would make sure damping & tuning are appropriate.
Link to where they are sold?
dave
Brace isn’t in the orientation i’d place it, and the back of the cutout needs chamfering (you can see that people have found this critical). A nit i would pick is the non-standard post spacing and that they would behard to remove.
Otherwise looks to be a solid build, and pretty.
dave
Otherwise looks to be a solid build, and pretty.
dave
I suspect it's a minor modification on the compact vented box I / we did when the driver first came out, with the vent shifted to the front (which partly misses the point of the alignment, but could be worse 😉 ). I still quite like this box; it's nothing fancy but takes off like a rat up a drainpipe.
http://www.madisound.com/pdf/SmallReflexA122p-191012.pdf
One example:
http://www.madisound.com/pdf/SmallReflexA122p-191012.pdf
One example:
