That sounds terrific and contender for best recorded loudspeaker sound at Youtube. I'm impressed. (right now I'm on cheap Oneodio cans Peace-Eq-ed to the Harmon target - will try later with Hifiman HE400x4 and T50RP-w. Brainwavz pads) that''s a wonderful recording and very joyful sound with the drums -drumstick/cymbal/piano nuances.
btw I could use some drum tracks (jazz preferably) to evaluate some of my Karlsonish toys - would you have recommendations ?
btw I could use some drum tracks (jazz preferably) to evaluate some of my Karlsonish toys - would you have recommendations ?
BSC baffle step correction. Usually just a simple circuit to balance the sound.
https://sound-au.com/bafflestep.htm#:~:text=The so called 'baffle step,for a range of frequencies.
I don't Know a best drum track.
Introducing My Favorite 4 CDs.
I used Helge Lien this time.
SPIRAL CIRCLE / HELGE LIEN TRIO (DIW-627)
Good Vibes-Jazz at the Pawnshop3 / ARNE DOMNERUS GROUP (PRCD9058)
The Best of Fourplay (EVSA765M)
Live at The Village Gate / CLARK TERRY (CHESKY JD49)
Oh, Baffle Step Correction Circuit.
I have never used it.
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@nandappe -- Thank you very much.
Here's a "tom - centric" drum track you may like - its not jazz in the sense of something which "swings" but nice
for evaluation of loudspeakers
https://en.wikipedia.org/wiki/Steve_Clarke_(drummer)#Discography
Here's a "tom - centric" drum track you may like - its not jazz in the sense of something which "swings" but nice
for evaluation of loudspeakers
https://en.wikipedia.org/wiki/Steve_Clarke_(drummer)#Discography
here's some cool stuff you may like
Muddy Waters Sings Big Bill - great recording of electric guitar sound
- also Muddy's "Folk Singer" album has exceptional dynamic ranger
https://www.youtube.com/playlist?list=PL2L2BDLggO-BFdnr2Ztt3imN4fqmWJnRY
Muddy Waters Sings Big Bill - great recording of electric guitar sound
- also Muddy's "Folk Singer" album has exceptional dynamic ranger
https://www.youtube.com/playlist?list=PL2L2BDLggO-BFdnr2Ztt3imN4fqmWJnRY
BG20 has a soft sound, an average texture, and a weak treble. Adding a magnet will increase the sharpness and texture.
SB20FRPC30-8 is sharp enough not to be offensive to the ears, and has a wide range with a lot of information.
It doesn't change much even if a magnet is added.
It is strange that magnets of the same size are used.
Looks like finally, something to play with along the lines of the Pass BOFU. 
http://p10hifi.net/FAL/downloads/Pass-BOFU-TL-map-010910.pdf
http://p10hifi.net/FAL/downloads/Pass-BOFU-TL-map-010910.pdf
After completing original Coral specified horncabinets for Coral-Beta-8 drivers, I had to realize, that these great old drivers had expired their lifetime. Sound was great for the most part, especially a very open high frequency, and the cabinets does a fine job for the bass. But at certain frequencies clear distortion was experienced, due to the drivers old age.
So looking for a new fullrange driver, I came upon the DIY project above, and decided to give the SB Acoustics SB20FRPC30-8 a try.
I am do happy with this new driver. Side by side the Beta-8 it does a pretty good job. Again the bass range is well served by the horn cabinet.
Can only recommend this new SB Acoustics driver - not expensive at all.
So looking for a new fullrange driver, I came upon the DIY project above, and decided to give the SB Acoustics SB20FRPC30-8 a try.
I am do happy with this new driver. Side by side the Beta-8 it does a pretty good job. Again the bass range is well served by the horn cabinet.
Can only recommend this new SB Acoustics driver - not expensive at all.
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Dear nandappe.
Thank you for your kind reply. As you inspired me to try the SB20FRPC30-8, I just wanted to share my experience.
Yes, you are probably fully correct in regards to the 40+ year old Beta8 drivers. I listened to them for some time, as I got the cabinets completed.
And the sound was very crisp nuanced throughout most of the spectrum. The driver is sensitive to off-axis listening; especially for the high frequency. The bass range was clearly improved by the cabinet; and it has been capable of playing quit loudly continuously for several hours.
But as described; distortion have now been identified at specific midtone ranges.
As I was looking for a new driver; I was recommended the drivers from Tang; Tang Band W8-2145 (150€) and the W8-1808 (300€) - but both drivers are to deep for the cabinet. And far too expensive for my current budget,
Then I checked Dayton Audio PS220-8 (200€) - which seems perfect for the job; also with a very nice finish.
And finally I checked Markaudio Alpair-12P (140€) - without finding any projects or reviews.
As I have had very good experiences with drivers from SB Acoustics, I decided to give the SB20FRPC30-8 driver a try, after reading about your project above.
The SB20FRPC30-8 driver is far cheaper than the above ones. But therefore also tempting to purchase; just for experimenting.
And I must say I'm quite surprised how well it performs. Above price as you stated; I completely agree.
It can perform at very loud levels too; with out any distortion at all. The bass range is still acceptable; and the of-axis listening is much better than the Beta8.
So no complaints until now.
I should like to try with the more narrower cabinet that you have posted here. It looks very nice and quite elegant, due to the narrow front.
I very much appreciate good sound and good loudspeakers - but I don't have a professional ear - nor am I comfortable with the engineering terms to describe the sound and listening experience. Just an amateur.
Thank you for your kind reply. As you inspired me to try the SB20FRPC30-8, I just wanted to share my experience.
Yes, you are probably fully correct in regards to the 40+ year old Beta8 drivers. I listened to them for some time, as I got the cabinets completed.
And the sound was very crisp nuanced throughout most of the spectrum. The driver is sensitive to off-axis listening; especially for the high frequency. The bass range was clearly improved by the cabinet; and it has been capable of playing quit loudly continuously for several hours.
But as described; distortion have now been identified at specific midtone ranges.
As I was looking for a new driver; I was recommended the drivers from Tang; Tang Band W8-2145 (150€) and the W8-1808 (300€) - but both drivers are to deep for the cabinet. And far too expensive for my current budget,
Then I checked Dayton Audio PS220-8 (200€) - which seems perfect for the job; also with a very nice finish.
And finally I checked Markaudio Alpair-12P (140€) - without finding any projects or reviews.
As I have had very good experiences with drivers from SB Acoustics, I decided to give the SB20FRPC30-8 driver a try, after reading about your project above.
The SB20FRPC30-8 driver is far cheaper than the above ones. But therefore also tempting to purchase; just for experimenting.
And I must say I'm quite surprised how well it performs. Above price as you stated; I completely agree.
It can perform at very loud levels too; with out any distortion at all. The bass range is still acceptable; and the of-axis listening is much better than the Beta8.
So no complaints until now.
I should like to try with the more narrower cabinet that you have posted here. It looks very nice and quite elegant, due to the narrow front.
I very much appreciate good sound and good loudspeakers - but I don't have a professional ear - nor am I comfortable with the engineering terms to describe the sound and listening experience. Just an amateur.