March Audio Sointuva Speaker

[March Audio]

I have been asked to show some renders of different finishes.

I will try and get some full box renders if I get time later and some of the actual wood finishes, but as a quick start here are some front baffles. Not sure if it really helps but here they are.

 

[CtheArgie]

Beautiful! The price too. Time to start putting away the pennies.

 

[SIY]

Alan, if you get any customers in the western US who will let me review and measure their set, I will unselfishly take one for the team.

 

[March Audio]

Alan, if you get any customers in the western US who will let me review and measure their set, I will unselfishly take one for the team.

Im sure something can be arranged

 

[CtheArgie]

Depending on my savings, I could arrange them to go to Amir for testing and then home if interested.

 

[MZKM]

Depending on my savings, I could arrange them to go to Amir for testing and then home if interested.

I’d chip in $25 to help offset the extra shipping.

 

[March Audio]

Well the plan was going to be to perform some final measurements today. However that has been scuppered due to the wind picking up.

Western Australia does not have an anechoic chamber that I am aware of and travel Sydney / Melbourne is extremely difficult with covid restrictions, so we are performing outdoor measurements. This works very well so long as there is no wind and you are a long way off the ground. We are performing the measurements at a height of 8m and well away from other objects/buildings. Its an extremely quiet rural area. This means we can get good low frequency data.

We managed to get one measurement in before having to abort. If you compare to previous measurements you can see how the low frequency ripples caused by ground proximity have almost completely disappeared.

For reference we are using an Earthworks M23 mic.

Low frequency is flat to 65Hz!

Again dont take this specific measurement as definitive yet ! We have to perform a whole range yet, this is just for interest.

Oh its on axis 1m with psychoacoustic smoothing.

Oh only other thing we have confirmed today is that the sensitivity is 85.5dB/2.83v/m. Pink random 500Hz to 2000Hz.

 

[Ilkless]

Well the plan was going to be to perform some final measurements today. However that has been scuppered due to the wind picking up.

Western Australia does not have an anechoic chamber that I am aware of and travel Sydney / Melbourne is extremely difficult with covid restrictions, so we are performing outdoor measurements. This works very well so long as there is no wind and you are a long way off the ground. We are performing the measurements at a height of 8m and well away from other objects/buildings. Its an extremely quiet rural area. This means we can get good low frequency data.

We managed to get one measurement in before having to abort. If you compare to previous measurements you can see how the low frequency ripples caused by ground proximity have almost completely disappeared.

For reference we are using an Earthworks M23 mic.

Low frequency is flat to 65Hz!

Again dont take this specific measurement as dinitive yet ! We have to perform a whole range yet, this is just for interest.

Oh its Psychoacoustic smoothing.

View attachment 95450

Oh only other thing we have confirmed today is that the sensitivity is 85.5dB/2.83v/m. Pink random 500Hz to 2000Hz.

-3 dB at 43 Hz

-6dB at 27Hz

Mad extension, hopefully Amir will get a chance to validate these measurements

 

[March Audio]

-3 dB at 43 Hz

-6dB at 27Hz

Mad extension, hopefully Amir will get a chance to validate these measurements

Dont take that as definitive, the wind was impacting the measurement, however the F3 is not far off that.

Well the measurement method is pretty uncontroversial, essentially free field. We will be measuring at 1m, 1.5m and 2.0m on turntable. TBH its probably better accuracy at LF than Klippel

 

[restorer-john]

I have been asked to show some renders of different finishes.

I will try and get some full box renders if I get time later and some of the actual wood finishes, but as a quick start here are some front baffles. Not sure if it really helps but here they are.

View attachment 95148View attachment 95149View attachment 95150View attachment 95151View attachment 95152View attachment 95153View attachment 95154View attachment 95155View attachment 95156

You're even veneering the routed driver cutouts? Wow, that's extreme attention to detail

 

[March Audio]

You're even veneering the routed driver cutouts? Wow, that's extreme attention to detail

Well they are just renders, not real, but these wont be veneered. Solid.

 

[amirm]

TBH its probably better accuracy at LF than Klippel

Before you get worried about any competition with NFS, I suggest posting measurements with sufficient resolution of 20 points/octave to figure out what the speaker is really doing. Stuff you post above are useless in this regard give how heavily they are filtered/smoothed. Most importantly, you need to set the vertical scale to 50 dB and use the proper aspect ratio. Right now you have 80 dB which helps fool the viewer into thinking the measurements are more flat than they really are. As it is, what you are showing are of no value in the type of analysis and measurements we do in the forum. They are more marketing graphs than technical....

 

[March Audio]

Before you get worried about any competition with NFS, I suggest posting measurements with sufficient resolution of 20 points/octave to figure out what the speaker is really doing. Stuff you post above are useless in this regard give how heavily they are filtered/smoothed. Most importantly, you need to set the vertical scale to 50 dB and use the proper aspect ratio. Right now you have 80 dB which helps fool the viewer into thinking the measurements are more flat than they really are. As it is, what you are showing are of no value in the type of analysis and measurements we do in the forum. They are more marketing graphs than technical....

Now now Amir dont get all tetchy

It was a (slightly sarcastic/tongue in cheek) comment on the fundamental accuracy of the measurement method. I refer you to the results and discussion about the low frequency accuracy of the Klippel in your Revel F328 review if you take issue with it. Klippel aint perfect.

Of course these measurements are of value.

The vertical scale on screen is nigh on identical to yours so the span is irrelevant. So no one is being fooled.

What the hell is a "proper" aspect ratio??????????? can you show it to me in a standard?

Psychoacoustic smoothing was used and clearly stated. It provides a representation more closely aligned to what you actually hear. I dont need to tell you that.

What is the resolution/smoothing you have used and why did you settle on that?

20 points? Why not 40?

Sure we can reduce the smoothing, I have no issue with that. I can match your settings if you think it helps - it is certainly useful for comparison purposes.

You use different measurements to assess and look for different things. This was just one - as noted - non definitive measurement.

So I am not sure what your issue is to be frank.

 

[March Audio]

1/12th smoothing

1/24th

 

[amirm]

What the hell is a "proper" aspect ratio??????????? can you show it to me in a standard?

Of course I can. From CEA-2034 specifications:

Seems like you haven't bothered to read it. It is a very common technique to flatten frequency response measurements by making the vertical dimensions much smaller and thereby squashing the differences.

 

[amirm]

1/12th smoothing

Why the bloody hell are you still using 80 dB vertical scale?

 

[amirm]

It was a (slightly sarcastic) comment on the fundamental accuracy of the measurement method. I refer you to the results and discussion about the low frequency accuracy of the Klippel in your Revel F328 review if you take issue with it.

Your speaker is no F328 tower with three woofers and two ports. The far field for a speaker is about 3 times its vertical height. In that regard, the F328Be tower at nearly 6 feet/2 meters is in entirely different class to measure than your little bookshelf. I suggest not getting into competitive war without understanding the issues. You do not have a proper measurement that I can see here.

 

[March Audio]

Why the bloody hell are you still using 80 dB vertical scale?

Amir can you calm down?

Instead of using emotive language and getting upset you could simply have made suggestions which I will gladly follow.

Thank you for pointing out the information. However it doesnt squash the differences, it just makes comparison easier and more valid.

 

[March Audio]

Your speaker is no F328 tower with three woofers and two ports. The far field for a speaker is about 3 times its vertical height. In that regard, the F328Be tower at nearly 6 feet/2 meters is in entirely different class to measure than your little bookshelf. I suggest not getting into competitive war without understanding the issues. You do not have a proper measurement that I can see here.

None of that matters, your Klippel measurements were not accurate on that particular test plus IIRC there has been conjecture about some other measurements.. That was and is the ONLY point I was making.

I am not comparing this speaker to the Revel, I am in no competitive war. Why are you saying this? I am genuinely confused.

...and yes I understand the issues well enough thank you.

The measurements are entirely proper. You have no basis to say otherwise.

Please take on board that I was not besmirching the Klippel or your efforts/data. That was not the intent of the slightly tongue in cheek comment above.

 

[March Audio]

So here you go, 1/24th smoothing with 50dB scale. As noted earlier the wind affected the measurement at the lowest frequencies.

@amirm why have you settled on 20 points not 24?