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In case it wasn't clear, not only are the tolerances tight, they aren't predictable. So EQing based on an anechoic sample of one doesn't make sense. The method is at home, in room, with your speakers and microphone.

The real answer is to EQ using in-room measurements. The rest is more academic or modeled using assumptions, like dip switch filters.

@Lars Risbo Do you have any comments?

They are antiques. As an investment, I don't know if they are worthwhile. For historical interest, definitely worth it. Lots of people invest without taking into account their costs (all the costs, including incidentals and time spent) of buying and maintaining their positions. If your...

Case in point, @Nuyes measured (gated, nonanechoic) 10 samples of the A6B, plotting the difference vs. Ascilab's reference sample. Tight tolerances. https://www.audiosciencereview.com/forum/index.php?threads/ascilab-a6b-review.60101/

You misunderstand the data. This is a sample of one and the deviations are very small. They are small enough that the nornal error of the Klippel fixture and microphone are within thise bounds. It is also not known if the deviations will be consistent across speakers. Part to part variation is...

The deviations are so small that the applying the correction filter does not make sense.

@restorer-john ?

https://www.hunecke.de/en/calculators/room-eigenmodes.html SBIR is usually between 100Hz-300Hz. Below 100Hz are room modes, to do with the dimensions of your room. Generally you need to use EQ, multiple subs, heavy and large panel based traps or a combination. None of the velocity based...

I have owned speakers with this kind of directivity. The tone changes with height. This kind of instability I lived with for a long time. Now it's one of the main signs I look for in a poorly considered design. One of the main mistakes I've made in the past is to buy gear for one specific...

It's a useful comparison.

Both have compromises. In a forced choice between the Ascends and the Genelecs, I would choose the Genelecs. In an open one, I would choose another speaker. Edit: Typos.

There are consequences to stacked drivers and asymmetric baffle arrangements. I can't think of a good reason to pick these given what else is out there...

https://www.erinsaudiocorner.com/loudspeakers/m_and_k_s150/ In short, yes. Although they do look cool.

Can you please give an example of the output?

Your local acousticians are amazingly organized: https://www.ioa.org.uk/find-acoustics-specialist-or-supplier Four show up for curtain products: http://www.siderise.com/ http://www.creationbaumann.com http://www.jcjoel.com/ http://www.acoustic-curtains.co.uk/

I know this is effective for absorption. I haven't heard of it being used for isolation other than in wall cavities to augment STC. In principle I can see it working. I had not heard of this tactic. It's smart.

I sometimes think about opening a shop, and then I think about how often I would probably talk my potential customers out of a purchase. And I actually did this all the time when I sold home theatre products. "Do I need this warranty?" "Probably not. Returns because of defective products are...

I would suggest Rose Brand curtains: https://www.rosebrand.com/

Hard to say. They state: Noise insulation: Sound energy is divided by eight, reaching a drop of up to 9 decibels (1). Reverberation of sound in the room is also reduced and creates a quieter atmosphere, e.g. for a surface area of approximately 215 ft² the reverberation time is reduced by 0.4...