MatrixS2000
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To go along with all of the above, it would be useful to understand what the tonal balance of the genre is. Here is a screen capture from Izotope’s Ozone for the Rock genre.One thing that we often see with speakers is that the in-room response rises up at or above the presence region. This is a really bad one, but there are many others that show similar traits:
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Measurements for speaker Dali Zensor 1
www.spinorama.org
Here is another example from a recent review in this forum:
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Polk Signature Elite ES20 Review (Bookshelf Speaker)
This is a review and detailed measurements of the Polk Signature Elite ES20 bookshelf speaker. I purchased it from Amazon for US $349 a pair including shipping. I really like the look and finish of this series from Polk. Despite budget pricing, it looks nice and purposeful as you can tell...www.audiosciencereview.com
I think with metal music in general, it is hard on the speakers because there is stuff going on everywhere. There is not a frequency range where nothing happens. The guitars generate a lot of overtones, again especially around the 4khz region where our ears are most sensitive.
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13 dBHL of hearing loss. Continue using IEMs and headphones?
These results are superimposed from the PTA audiogram test I had and it looks like I have low-frequency hearing loss in both ears (13dBHL right ear and 12dBHL left ear), and my right ear has lost some high frequencies. This makes me wonder, how long can use IEMs and headphones until it reaches...www.audiosciencereview.com
If you combine this with speakers like shown above, you will get a poor result.
On the low end then, you might have a double bass that constantly kicks. Lesser 2-ways with a woofer that has to try and play bass+midrange at the same time then suffer from IMD distortion.
With regards to the speaker market, I want to say that around the 1000-4000€ range, there are a lot of well engineered speakers. If you go above that, I think that very often brands to like distinguish themselves by doing things differently. This might work for some genres. Especially the classic audio show jazz song with some nice bass and a good female voice might even benefit from strange frequency response and people will gush about all the details that they can hear with the speaker. We've all seen the insane measurements of really expensive speakers at Stereophile.
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This is 12000$/pair https://www.stereophile.com/content/bowers-wilkins-diamond-series-804-d4-loudspeaker-specifications
For me then, a good speaker for metal has to have no rising high frequency response in-room and has to be able to dish out the bass without sacrificing the mid-range. Volume is honestly not that important to me, just because it's metal does not mean I need or want concert levels at home. I mostly listen at 78-86dBC, peaks maybe at 105dB and that is more than enough.
I like your designs, but maybe you could build something smaller and more affordable, if it doesn't go loud as hell what would be fine with me.
From Izotope:
The factory target curves were generated through an analysis of chart-topping hit songs from a range of different genres.