Just got my pair today, plonked them in a old box of about 55L with a port tuned to about 39hz.
Initial listening:
A) Harsh/sibilant
B) Very very very good bass, I had a Coral Beta 8 in this enclosure and it certainly beats it hands down.
After some discussion, I put on about 3db of BSC right about 800hz and it fixed most of the harshness and sibilance, so very very happy now.
Still sufficiently efficient to be powered by SETs so, that's great!
Initial listening:
A) Harsh/sibilant
B) Very very very good bass, I had a Coral Beta 8 in this enclosure and it certainly beats it hands down.
After some discussion, I put on about 3db of BSC right about 800hz and it fixed most of the harshness and sibilance, so very very happy now.
Still sufficiently efficient to be powered by SETs so, that's great!
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Working well in TQWT. Haven't found them overly sibilant, especially after some digital room correction. Would recommend, especially for the price. Will try them in a bass reflex enclosure as well. I know, glass table between speakers and listener not good. Also, excuse a 60+ year old man listening to George Michael on vinyl, and drinking red wine out of a duralex coffee glass. What a great hobby we have. Stay safe all!
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My personal opinion would be that if the size constraints require such a small volume, it would be better to use a closed box and add some subs.
Vented seems allright from about 50 litres to 70 liters, no deep bass but you can use a nice controlled roll off to get a bit of 40hz.
Edit:
Adding the data from SB that most likely pertains to "our" drivers, most vendors post the prototype data which is not likely to be correct.
https://sbacoustics.com/wp-content/uploads/2022/04/8in-SB20FRPC30-8.pdf
Vented seems allright from about 50 litres to 70 liters, no deep bass but you can use a nice controlled roll off to get a bit of 40hz.
Edit:
Adding the data from SB that most likely pertains to "our" drivers, most vendors post the prototype data which is not likely to be correct.
https://sbacoustics.com/wp-content/uploads/2022/04/8in-SB20FRPC30-8.pdf
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Thanks for the responses guys.
Does it need as much volume as it does, due to it's own size? I ask as I've seen smaller drivers (4-5") being tuned to 50hz in things like the XRK Karlsonators and Dave's Monkens.
Would a different alignment like a TL cut down the volume?
Still in the very newbie stage and I was hoping these guys would be a good budget experiment point.
Does it need as much volume as it does, due to it's own size? I ask as I've seen smaller drivers (4-5") being tuned to 50hz in things like the XRK Karlsonators and Dave's Monkens.
Would a different alignment like a TL cut down the volume?
Still in the very newbie stage and I was hoping these guys would be a good budget experiment point.
The only problem is the Vas.
It is to big.
Small parameters problems.
Needs a bigger box.
Ideal box is 86 litre 30hz-3db
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If you choose Alpair 11MS you will get 50hz in a 12 litre box!!
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Much to learn! Thank you everyone for your comments and explanations!
So basically if I wanted to lower overall volume, I need to use a smaller driver.
To maintain the extension in that instance, I’d have to accept a lower max spl as the compromise.
From my understanding there would be some middle ground in using a smaller woofer dedicated to low end extension aka WAW. But then we are back to creating crossovers, not as bad as a traditional 2 way, but still a crossover with expensive parts due to the low cross point.
Many things to consider!
So basically if I wanted to lower overall volume, I need to use a smaller driver.
To maintain the extension in that instance, I’d have to accept a lower max spl as the compromise.
From my understanding there would be some middle ground in using a smaller woofer dedicated to low end extension aka WAW. But then we are back to creating crossovers, not as bad as a traditional 2 way, but still a crossover with expensive parts due to the low cross point.
Many things to consider!
Cool design Freddi,hey X - here's two cubic foot of airspace and a cabinet which might get around BSC (?)
I like the idea of having horn loading where there is a lot of music power in the upper bass. But what will happen to the high frequencies in a design like this?
Most plate amps have filters built-in, so if you go that route a small closed box for the tops and a sub or two with plate amp(s) is all you really need. Adjust xo to taste.
+ use of EQ. Linkwitz Transform? ....
http://www.mh-audio.nl/Calculators/LinkwitzTransformation.html
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http://www.mh-audio.nl/Calculators/LinkwitzTransformation.html
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I just got a pair of the 8" SB FR and wanted to know is Sealed OK 30 litre cause I will be using peerless xls 10 or the beyma 12br70 left right so a 2.2 system or a ripole ( need to try and experience as sub
Anyone tried SB FR sealed hows the sound. stand alone and with SUB. also can I connect directly to amp witout crossover. I hate making a crossover since i am nottechnical. can try mindsp 2x4HD but if it works direct crossoverless will be great
Anyone tried SB FR sealed hows the sound. stand alone and with SUB. also can I connect directly to amp witout crossover. I hate making a crossover since i am nottechnical. can try mindsp 2x4HD but if it works direct crossoverless will be great
Minimum effort with perhaps mixed results:
I would advise you to at the very least use some coils for the 12BR70 to reduce higher frequencies/potential for combing effects.
The easy yet still successful route:
Just get basic plate amps with built in crossovers for the bass and you will be fine, especially if you have decided on the closed boxes thing.
I would advise you to at the very least use some coils for the 12BR70 to reduce higher frequencies/potential for combing effects.
The easy yet still successful route:
Just get basic plate amps with built in crossovers for the bass and you will be fine, especially if you have decided on the closed boxes thing.
In open baffle the sb and beyma is a great combo...simple flat baffle ,H or slob too ...have fun