Alpair MAOP 10.2

[LeifB60]

Here are parameters:
MAOP10.2 260A
FS 43.70
VAS 18.9370
QMS 1.6972
QES 0.447
QTS 0.3538
SD 90cm2
CMS 1.6772
MMS 7,556 g
RMS 1.2506 WM
RAT 74193 WA
RMT 5.9990 WM
MMD 7.0734 g
h0 0.36%
L.1kHz 1.2949 mH
L10kHz 0.0961 mH
RE 7.2000 ohm

MAOP10.2 260B
FS 43.44
VAS 18.7973
QMS 1.6583
QES 0.4458
QTS 0.3514
SD 90 cm2
CMS 1.6649
MMS 7.8030 g
RMS 1.3270 WM
RAT 77456 WA
RMT 6.2628 WM
MMD 7.3204 g
h0 0.35%
L1kHz 1.2588 mH
L10kHz 0.0989 mH
RE 7.2000 ohm

 

[planet10]

Do you have anything to beta test for the MAOP 11.2 drivers that are on their way to me?

There is MAOP P11.2?

data

 

[Robin De Wolf]

I am referring to this MAOP 11:
Fullrange speaker MarkAudio MAOP 11.2 (WHITE), 8 ohm, 172 mm

 

[planet10]

mini Onken... is around 11-12 liters I think

11 Litres.

dave

 

[planet10]

I’ll have a look at the P11.2 MAOP, thanx.

dave

 

[LeifB60]

Thanks Dave!
Thats a good start.

 

[nandappe]

What is the difference between MAOP11 and MAOP11.2?

 

[planet10]

Not much based on the specs.

dave

 

[LeifB60]

I have found a calculator on mh-nl.com site.
Can I use that dave?
Onken calculator.

 

[LeifB60]

Calculate Onken Bass Relex Loudspeaker

 

[Scottmoose]

It has nothing to do with Dave's Fonken / marKen designs, which only resemble Onkens, but are functionally almost the exact opposite in alignment & design intention.

 

[Scottmoose]

Re the 11MAOP / 11.2MAOP, as far as I know, there is no practical difference for the end user. They are technically right to describe it like that, but it's not all that significant for buyers.

Based on fallible memory, rather like the 11MS, MA had to make some changes to the spec. of a couple of components in the Pluvia 11 (which the 11MAOP is based on), mainly because the suppliers couldn't get the tolerance consistent, which in turn meant a high reject rate of the components in question. No criticism of the component supplier -these are not easy to produce consistently. However, it does get expensive when you need to constantly test the components before use & bin significant numbers of the things, so they altered the spec. to make it easier for them to be produced to a high rate of consistency, while providing more or less the same results.

 

[LeifB60]

Yes I noticed it when I set the parameters.
16 liter box with 6 pieces 1cmx6cm length 30cm port.
But f-3 at 48Hz.
Regards Leif

 

[nandappe]

Thanks Dave and Scott.

I will ignore the difference between MAOP11 and MAOP11.2.

 

[LeifB60]

I have to come up with my own construction.
12 liter bass reflex. Or a Tapered Quarter-Wave Tube.
I think a BIB works too.
20 liter bass reflex seem to work to.

 

[planet10]

I have found a calculator on mh-nl.com site.

Not for the miniOnken alignment. It is not an official Onken which typically have a low bass shelf kind of alignement, althou more done as a maxFlat alignment.

dave

 

[Robin De Wolf]

They look great IRL. Currently testing in 12L BR. Tomorrow I will resume listening but so far it sounds really promising!
(Tweeters are from original B&W CM5 but disconnected).

One thing I noticed is an excess of bass. Cabinet is lined and stuffed made from plywood with a 15 cm port. Modelling in WINISD (f3 52 Hz) proposes a nice response though. I might need to move them further in the room?

 

[vinylkid58]

One thing I noticed is an excess of bass. Cabinet is lined and stuffed made from plywood with a 15 cm port.

I've never stuffed a BR. Maybe pull out the stuffing and see if that helps the excess bass.

jeff

 

[Robin De Wolf]

I will try that tomorrow. My drivers seem not to be matched looking at the numbers. Does anyone know if the measured parameters will cause an audible difference?

 

[Scottmoose]

You must have very high standards for pair matching, because according to that data, those drivers are rather close.

The three critical for bass alignment (the first two dominating) and the variation:
Fs variation: 0.2Hz
Qt variation: 1.5%
Vas variation: 7.4%

As far as outout goes, rated SPL variation between them is 0.31dB.