Hi all!
I was wondering if someone could help me sorting some solution for a pair of beymas I have.
I tried the "viech",and although they´re not finished,they really lack bass,but i´m guessing that has got to do more with my living room...
anyway,the viech´s are too big and
i would like to know what other designs I could try out with these modest but
delightful drivers!
thanks everybody 🙂
I was wondering if someone could help me sorting some solution for a pair of beymas I have.
I tried the "viech",and although they´re not finished,they really lack bass,but i´m guessing that has got to do more with my living room...
anyway,the viech´s are too big and
i would like to know what other designs I could try out with these modest but
delightful drivers!
thanks everybody 🙂
Delightful they may be (can't comment, never heard a pair) but being very weakly damped they're not going to be particularly happy / useful in a small box. Max-flat vented by Keele is about 254 litres for e.g. You might be better off using them on a small OB & crossing to a box bass unit if you need compact.
Yeah, it really wants a huge BLH......... Anyway, a quick peek shows that a minimal ripple sealed alignment is about the best size Vs LF gain BW overall, so ~5 ft^3 tuned to ~40 Hz for a ~40 Hz F3 and the 6" dia. x 5" long vent stuffed to suit to damp Fb peaking, though peak SPL will be modest below Fs. Hopefully they can be shoved into corners to help a bit with that.
GM
GM
what a shame...I guess I´ll have to stick with those huge horns after all...
I better have a look at some threads then,about finishing the boxes!
about cheap full range drivers,is there anything new that´s been raved lately?
Here in Portugal,unfortunately,Fostex(and other known brands) only online and from other countrys,which turns the price into something not so appealing...
I better have a look at some threads then,about finishing the boxes!
about cheap full range drivers,is there anything new that´s been raved lately?
Here in Portugal,unfortunately,Fostex(and other known brands) only online and from other countrys,which turns the price into something not so appealing...
That, or do as Scott suggested, a OB/bass bin system XO'd around 80 Hz.
The various Markaudio designs including the CSS variants have been getting a lot of favorable press lately. Their low Vas, ergo low efficiency to presumably primarily keep the cab small appears to be their major downside. Using two and rolling one off sims OK WRT acceptable vent length without having to go ~aperiodic, though I've read some folks are fine with both running full-range at longer listening distances.
Anyway, what brands can you get locally and/or what countries can you get drivers from the cheapest once shipping and I assume VAT is factored in? I figured that at least Visaton and/or Monacor would be available to you at ~reasonable cost.
GM
The various Markaudio designs including the CSS variants have been getting a lot of favorable press lately. Their low Vas, ergo low efficiency to presumably primarily keep the cab small appears to be their major downside. Using two and rolling one off sims OK WRT acceptable vent length without having to go ~aperiodic, though I've read some folks are fine with both running full-range at longer listening distances.
Anyway, what brands can you get locally and/or what countries can you get drivers from the cheapest once shipping and I assume VAT is factored in? I figured that at least Visaton and/or Monacor would be available to you at ~reasonable cost.
GM
I've been raving for some time about the Visaton FRS8M. They're made in mainland Europe, so you should be able to get hold of some. They're good at the price, but not on the same level as Fostex etc.
GM beat me to it...
GM beat me to it...
thanks again for all your posts!
Unfortunately,there isn´t much to choose from driver wise here in Portugal...
The easiest to find though,is the Visaton frs8,but it doesn´t get that cheap either...
The speakers and remaining parts for the project would set me back about 90 euros,and for me that value is a bit steep since it has low spl,which is a major drawback,since I can get some nice Wharfedale Diamonds for that amount,and this would be much more versatile.
The beymas are much more interesting,they can withstand a bigger load,they´re more efficient and can play well with a variety of low budget amps.
It is a shame that despite their large size,they fail big time regarding bass reproduction,sounds really light...
About OB´s with this driver,the addition of a woofer right now would cost me a lot more,and at this moment I´m a bit strapped for cash unfortunately.Maybe someday with a nice amp... 🙂
By the way,how could I get the best out of my "viechs" regarding room placement?
How much toe in,near the corners?...
Thanks again for your replies! 🙂
Unfortunately,there isn´t much to choose from driver wise here in Portugal...
The easiest to find though,is the Visaton frs8,but it doesn´t get that cheap either...
The speakers and remaining parts for the project would set me back about 90 euros,and for me that value is a bit steep since it has low spl,which is a major drawback,since I can get some nice Wharfedale Diamonds for that amount,and this would be much more versatile.
The beymas are much more interesting,they can withstand a bigger load,they´re more efficient and can play well with a variety of low budget amps.
It is a shame that despite their large size,they fail big time regarding bass reproduction,sounds really light...
About OB´s with this driver,the addition of a woofer right now would cost me a lot more,and at this moment I´m a bit strapped for cash unfortunately.Maybe someday with a nice amp... 🙂
By the way,how could I get the best out of my "viechs" regarding room placement?
How much toe in,near the corners?...
Thanks again for your replies! 🙂
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The Beyma is nominally underdamped, and has quite a high resonant frequency & Vas. Couple that with a relatively small horn for the driver, and lightish LF is inevitable I'm afraid. Re positioning, basically, it's going to be a case of 'suck it and see.' Every room is different, every system is different. Ten minutes of playing with their positions is going to tell you more than any of us ever could, other than noting you may pick up some more LF gain if you can ram them into corners.
FRS8Ms not coming cheap? You must be really struggling with suppliers; I paid £9 apiece for mine a couple of years back & you certainly wouldn't want to be spending much more on them.
FRS8Ms not coming cheap? You must be really struggling with suppliers; I paid £9 apiece for mine a couple of years back & you certainly wouldn't want to be spending much more on them.
Well...I gave them a go in a bass reflex enclosure and the results are excelent,regarding bass!
I tried the beymas in an enclosure using 10mm mdf,just for testing purposes,without much planning (damping or bracing for instance) and they sound marvelous!
Bass goes way deeper than in the viechs and the sound has a warmer character,without loosing any of it´s best qualities!I may try to build a higher quality enclosure and definitely put aside the giant viechs!
Lovely defined bass! 😀
15 euros for the mdf,48 euros for the drivers,2 euros for clip on terminals,some dracalon
(don´t know if that´s the way it´s spelled) and glue...cheap as chips!
I tried the beymas in an enclosure using 10mm mdf,just for testing purposes,without much planning (damping or bracing for instance) and they sound marvelous!
Bass goes way deeper than in the viechs and the sound has a warmer character,without loosing any of it´s best qualities!I may try to build a higher quality enclosure and definitely put aside the giant viechs!
Lovely defined bass! 😀
15 euros for the mdf,48 euros for the drivers,2 euros for clip on terminals,some dracalon
(don´t know if that´s the way it´s spelled) and glue...cheap as chips!
yep...dacron,that´s it!sorry...
Searching through the "viech" thread by Cyburg,he mentioned some test with the beymas in a 45liter br enclosure with nice results,in thin mdf.
I used an online calculator for box dimensions (can´t remeber which one),with all the
beyma´s parameters, and despite the recommendation for a 4,4cm port length,I just made a 10cm diameter hole,kept it really simple.
And they really deliver!
I made a post in the fullrange gallery,but since this isn´t an original project nor my design,I´m a bit reluctant about posting the details here...but if I´m being too careful regarding it´s "patent" I´m sorry!
And the project has a lot of development potential!
The beymas aren´t being to bragged about around diyaudio,but they have a lot of potential as well!
Searching through the "viech" thread by Cyburg,he mentioned some test with the beymas in a 45liter br enclosure with nice results,in thin mdf.
I used an online calculator for box dimensions (can´t remeber which one),with all the
beyma´s parameters, and despite the recommendation for a 4,4cm port length,I just made a 10cm diameter hole,kept it really simple.
And they really deliver!
I made a post in the fullrange gallery,but since this isn´t an original project nor my design,I´m a bit reluctant about posting the details here...but if I´m being too careful regarding it´s "patent" I´m sorry!
And the project has a lot of development potential!
The beymas aren´t being to bragged about around diyaudio,but they have a lot of potential as well!
Interesting, Dacron doesn't come to mind for damping material.
Normally any published design can be built for personal use unless specifically requested not to be, though of course it's always nice to give credit to the designer.
FWIW, the longer vent in theory should sound a little nicer.
GM
Normally any published design can be built for personal use unless specifically requested not to be, though of course it's always nice to give credit to the designer.
FWIW, the longer vent in theory should sound a little nicer.
GM
I have quite a load of dacron on my "viechs" and they helped minimizing midband coming through the horn throat.
I shall post enclosure dimensions then,as soon as possible!
About the longer the vent,it was quite the opposite!The calculator I used,defined 4,4cms for the vent length.I bought vents with twice as much as that,and since I didn´t want to chop off something that set me back as much as 5euros a piece,I installed them that way.To my surprise and sadly,there was no bass at all...
Then for no particular reason,removed the ports and...voilá!there was articulate,deep enough bass for me,the sound became weightier and more grown up!I´m not bass addicted,nor an audiophile,but I think that after I removed the vent,the sound became more balanced!
And all this really cheaply built! 😀
I shall post enclosure dimensions then,as soon as possible!
About the longer the vent,it was quite the opposite!The calculator I used,defined 4,4cms for the vent length.I bought vents with twice as much as that,and since I didn´t want to chop off something that set me back as much as 5euros a piece,I installed them that way.To my surprise and sadly,there was no bass at all...
Then for no particular reason,removed the ports and...voilá!there was articulate,deep enough bass for me,the sound became weightier and more grown up!I´m not bass addicted,nor an audiophile,but I think that after I removed the vent,the sound became more balanced!
And all this really cheaply built! 😀
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What do you mean by different strokes for different folks?(please excuse my limited english knowledge)
What does the graph show?
What does the graph show?
It means what is to one person nectar is cyanide to another. Otherwise known as 'we all like different things.'
That's the 1/2 space frequency response of the Beyma 8AG/N in a 45 litre BR with a vent of those dimensions, courtesty of WinISD and double-checked in MathCAD.
That's the 1/2 space frequency response of the Beyma 8AG/N in a 45 litre BR with a vent of those dimensions, courtesty of WinISD and double-checked in MathCAD.
then,it must play well due to my bass frequency eating living room.
I just made the post so that people would give it a go as it is simple and cheap and
more effective than what you make it sound!
but I guess we just can´t beat some serious graphs... 🙁
anyways,i´ll keep my nectar! 🙂
I just made the post so that people would give it a go as it is simple and cheap and
more effective than what you make it sound!
but I guess we just can´t beat some serious graphs... 🙁
anyways,i´ll keep my nectar! 🙂
Of course you can (beat modelled FR plots). Depends entirely on context. The above are only 1/2 space / quasi anechoic, & the room dominates below ~300Hz anyway, so while I wouldn't personally regard this as an acceptable alignment, if they work for you, then that's what matters.
it is without a doubt not a faulted design only because of my living room,I´m sure of that.
The only reason I can think of is the small cone excursion of the Beyma´s.In my living room,even a pair of wharfedale diamond 8.1,with small mid/bass drivers sound really boomy...
The only reason I can think of is the small cone excursion of the Beyma´s.In my living room,even a pair of wharfedale diamond 8.1,with small mid/bass drivers sound really boomy...
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