Liebe DIY-Gemeinde, liebe MarkAudio-Spezialisten – gibt es hier im Forum jemanden, der eine fundierte Aussage über die Stimmfrequenz des Classic GR Mar-Ken12p beim Vergleich zu dem des Alpair 12.2p Small Reflex (abgestimmt auf 55 Hz) machen kann, zB wie tief kann der MA 12P /P12.2 in diesem Gehäuse (Classic GR Mar-Ken12p) im LF-Bereich gehen?
Mit freundlichen Grüßen Stefan
Mit freundlichen Grüßen Stefan
Small Reflex.
The 35 litre CGR for the A12pw has an estimated about 30 Hz F10. I don’t think i have done a smaller one (a 17 litre should work, won’t go as low)
dave
The 35 litre CGR for the A12pw has an estimated about 30 Hz F10. I don’t think i have done a smaller one (a 17 litre should work, won’t go as low)
dave
Hi Dave,
sorry, what a heck - I thought that I'd been in the translation modus of this site. I just calculated the inner volume of the Classic GR Mar-Ken12 p 0 v 8(31- august-2017 | designed & drawn by dld ,© 2010-2017 planet_10 enterprises limited) and I got 13,5 litre up to the channel board and about 14,5 litre without. This cabinet has been designed for the MA Alpair12 P - the A 12 Pw, I agree would be silghtly different. The "Alpair 12.2p Small Reflex"(designed by S. Lindgren drawn by dld 19-october-2012) tuned to 55 Hz - has an inner volume of 16,4 litre. So in the end - colse to 45 Hz from a standmount cabinet a bit bigger and driven by a MA 12 P Gen. 2 would be real funny!
Kind regards to BC 😉
Sincerely
Stefan
sorry, what a heck - I thought that I'd been in the translation modus of this site. I just calculated the inner volume of the Classic GR Mar-Ken12 p 0 v 8(31- august-2017 | designed & drawn by dld ,© 2010-2017 planet_10 enterprises limited) and I got 13,5 litre up to the channel board and about 14,5 litre without. This cabinet has been designed for the MA Alpair12 P - the A 12 Pw, I agree would be silghtly different. The "Alpair 12.2p Small Reflex"(designed by S. Lindgren drawn by dld 19-october-2012) tuned to 55 Hz - has an inner volume of 16,4 litre. So in the end - colse to 45 Hz from a standmount cabinet a bit bigger and driven by a MA 12 P Gen. 2 would be real funny!
Kind regards to BC 😉
Sincerely
Stefan
13 :itres is the small CGR that can be fitted with A10.x/10p/12p, EL70/FE127. There is a 17 litre for A10p/12p, 35 litre for the A12pw and FF225wk, and a bunch of smaller ones down to 2.5 litre.
Scott’s reflex uses essentially the same volume as the 17l CGR, but i don’t know why it wa scalled small, it is as large as we’d like to go.
The nature of the tuning is different, Scott ses a simple plumbing pipe duct, i use high-R vents. Scott’s will go lower, mine will have more finesse.
In general: there are rooms and amps involved in the equation.
13 litre A12p CGR (prime size and smallish for the A12p) is in the low 50s anechoic. 17 litre is high 40s. About 5 Hz difference. Looks like it would work in 10 litres, high 50s F10.
dave
Scott’s reflex uses essentially the same volume as the 17l CGR, but i don’t know why it wa scalled small, it is as large as we’d like to go.
The nature of the tuning is different, Scott ses a simple plumbing pipe duct, i use high-R vents. Scott’s will go lower, mine will have more finesse.
In general: there are rooms and amps involved in the equation.
13 litre A12p CGR (prime size and smallish for the A12p) is in the low 50s anechoic. 17 litre is high 40s. About 5 Hz difference. Looks like it would work in 10 litres, high 50s F10.
dave
Hi Dave,
thanks for your information - I think a 17l CGR with high 40s would fit. But fhere's no cabinet like this at: http://frugal-phile.com/boxes-markaudio.html and the only cabinet CGR 10p - http://p10hifi.net/FAL/downloads/CGR-MarKen103p-plan-040414.pdf ( Classic Golden Ratio Mar-Ken10.3 / 10 p 0v8) only has an internal volume of 14 litre. My two way monitors with sealed cabinets ends at 54 Hz, so a bit lower and the more efficiency of the MA 12p Gen. 2 - would be it.
Kind regards
Stefan
thanks for your information - I think a 17l CGR with high 40s would fit. But fhere's no cabinet like this at: http://frugal-phile.com/boxes-markaudio.html and the only cabinet CGR 10p - http://p10hifi.net/FAL/downloads/CGR-MarKen103p-plan-040414.pdf ( Classic Golden Ratio Mar-Ken10.3 / 10 p 0v8) only has an internal volume of 14 litre. My two way monitors with sealed cabinets ends at 54 Hz, so a bit lower and the more efficiency of the MA 12p Gen. 2 - would be it.
Kind regards
Stefan
There is in the paid planset. Or it could if i have not already finished it.
I typically put a free 15mm material CGR plan as a teaser.
dave
I typically put a free 15mm material CGR plan as a teaser.
dave
Hello, Dave.
I’m sorry for replying a bit late. I calculated “third root of 17Litre” = 25. 7 cm sound wall width, 25. 7 x 0. 618 = 15. 9 cm housing depth and the height would be 25. 7 x 1. 618 = 41. 6 cm. This would then be freely variable and optimized in terms of the size regarding the ear height on the speakerstand.
A golden Ratio should cause the fewest additions of resonances. In addition to the artistic harmonic aspect, this ratio of sizes is also optimal in terms of sound. You get by almost without insulation or with minimal insulation.
But these are all internal dimensions and the “bracing” should not be a problem from the schema. The only question then would be, how do I determine the size of the “ventilation opening” depending on the loudspeaker MA 12 P Gen. 2? So about Sd? Ventilation openings are often chosen to be larger than bass reflex openings, especially for paper cone speakers.
How about your approach – is there a “secret trick”? Or a rule?
Kind regards to BC and a fine weekend
Stefan
I’m sorry for replying a bit late. I calculated “third root of 17Litre” = 25. 7 cm sound wall width, 25. 7 x 0. 618 = 15. 9 cm housing depth and the height would be 25. 7 x 1. 618 = 41. 6 cm. This would then be freely variable and optimized in terms of the size regarding the ear height on the speakerstand.
A golden Ratio should cause the fewest additions of resonances. In addition to the artistic harmonic aspect, this ratio of sizes is also optimal in terms of sound. You get by almost without insulation or with minimal insulation.
But these are all internal dimensions and the “bracing” should not be a problem from the schema. The only question then would be, how do I determine the size of the “ventilation opening” depending on the loudspeaker MA 12 P Gen. 2? So about Sd? Ventilation openings are often chosen to be larger than bass reflex openings, especially for paper cone speakers.
How about your approach – is there a “secret trick”? Or a rule?
Kind regards to BC and a fine weekend
Stefan
While Golden Ratio is a pleasing shape, it is the use of irrational numbers that leads to lower issues with air-space resonances and not just the irrational number phi. These ratios make no difference in the amount of internal airspace damping.
Getting the right shape starting from that cube root, to an external ratio that fits given you are adding walls, braces and vents at the bottom takes the most time.
You are asking me to give up my special alignment? Many clues have been given out, but i am not going to just give it away. It is a shape of the curve in the alignment i look form and it changes somehat depending on how low the driver goes. The curve seen is not the curve you end up for as the box programs do not account for the highR vent. Some experience required to get that right.
dave
Getting the right shape starting from that cube root, to an external ratio that fits given you are adding walls, braces and vents at the bottom takes the most time.
You are asking me to give up my special alignment? Many clues have been given out, but i am not going to just give it away. It is a shape of the curve in the alignment i look form and it changes somehat depending on how low the driver goes. The curve seen is not the curve you end up for as the box programs do not account for the highR vent. Some experience required to get that right.
dave