Hi to all.
This is my first post here so please go easy on me. I've tried to search but can't really find the right advice so I thought I'd ask.
I've got a pair of Visaton FR10 8 ohm which I'm trying to make into a bluetooth boombox for my wife.
I built a double enclosure for them; a sealed box 40x25x25cm split in the middle to make 2 boxes. At the moment it doesn't sound too great, the bass is really lacking and the whole thing is a bit, well, rubbish.
I made a removable baffle held on with threaded rods and nuts, so I could easily put reflex ports in there, either front or back if it'l help, or really make any changes up to and including a whole new box....
The amplifier I'm using is a cheapo from eBay, and I'm probably going to keep it that way, I'm just looking to get some info on how to get the best from the drivers.
I don't know anything about the science of speaker building, all the graphs and charts are a bit advanced for me, so some basic advice would be very gratefully received.
Cheers
This is my first post here so please go easy on me. I've tried to search but can't really find the right advice so I thought I'd ask.
I've got a pair of Visaton FR10 8 ohm which I'm trying to make into a bluetooth boombox for my wife.
I built a double enclosure for them; a sealed box 40x25x25cm split in the middle to make 2 boxes. At the moment it doesn't sound too great, the bass is really lacking and the whole thing is a bit, well, rubbish.
I made a removable baffle held on with threaded rods and nuts, so I could easily put reflex ports in there, either front or back if it'l help, or really make any changes up to and including a whole new box....
The amplifier I'm using is a cheapo from eBay, and I'm probably going to keep it that way, I'm just looking to get some info on how to get the best from the drivers.
I don't know anything about the science of speaker building, all the graphs and charts are a bit advanced for me, so some basic advice would be very gratefully received.
Cheers
.......you have two sealed volumes in one box........
is 40x25x25cm the inner dimension of this building?
you can use the fr10 in a bass reflex box (volume around 6.....10 liter or so ,for each speaker).
there is a "hump" in the frequency response of the fr10 around 2...3kHz,this can be corrected with a rlc-network in series with the speaker.
is 40x25x25cm the inner dimension of this building?
you can use the fr10 in a bass reflex box (volume around 6.....10 liter or so ,for each speaker).
there is a "hump" in the frequency response of the fr10 around 2...3kHz,this can be corrected with a rlc-network in series with the speaker.
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Thanks for your reply. Sorry it's taken so long to get back to you, work and all that.
Yes, it's two enclosures in one box. I like the idea of bass reflex. The internal dimensions of each box are roughly 21x18x25cm. I make this just under 9.5l per enclosure.
I've found various calculators online for the reflex port, but don't know what frequency to aim for, and there are other variables, like Qt, Qs, and compliance that I'm not sure about. Given that I'm not aiming to achieve the perfect sound, just a reasonable amount of bass, is there a simpler, rough calculation I can use?
Thanks in advance
Yes, it's two enclosures in one box. I like the idea of bass reflex. The internal dimensions of each box are roughly 21x18x25cm. I make this just under 9.5l per enclosure.
I've found various calculators online for the reflex port, but don't know what frequency to aim for, and there are other variables, like Qt, Qs, and compliance that I'm not sure about. Given that I'm not aiming to achieve the perfect sound, just a reasonable amount of bass, is there a simpler, rough calculation I can use?
Thanks in advance
With a Qt of 1.44 this driver is not well suited to a vented enclosure. With an Fs of 120 it is not going to go that low. In any sealed box it is going to have a bumpat the bottom -- how big a bump is hard to say, the data sheet does not give Vas.
I'd say you want to put it in as big a box as you can live with, then make it aperiodic to bring doen the "LF" bump (and extend the effective depth of the bass)
dave
I'd say you want to put it in as big a box as you can live with, then make it aperiodic to bring doen the "LF" bump (and extend the effective depth of the bass)
dave
sorry, i think there is a mistake........see data on the visaton site.
FR 10 - 8 Ohm: Fs=90Hz.........Qts=0,67.......Vas=2,3l and so on.
FR 10 - 8 Ohm
FR 10 - 8 Ohm: Fs=90Hz.........Qts=0,67.......Vas=2,3l and so on.
FR 10 - 8 Ohm
Plugging in these "new" values, ...with his 'fixed' volumes at 9.5 liters.....It's OK!
The simulation calls for 12.3 liters......Reworking & retuning for 9.5 liters I get -3.03Db@ 48.44 Hz.
Fb is set at 56 Hz.....still ok. Port size is at 47mm diameter, 137mm long.
Some light, thin cotton batting inside & this should work fine.
If one were to put a mis-matched port tube in this 9.5 liters...it really wouldn't work right.....................Tell us how big/small a piping we have to use & I'll plug that number into the SIM.............& we will know how short to cut it, OK?
_______________________________________________________Rick.........
The simulation calls for 12.3 liters......Reworking & retuning for 9.5 liters I get -3.03Db@ 48.44 Hz.
Fb is set at 56 Hz.....still ok. Port size is at 47mm diameter, 137mm long.
Some light, thin cotton batting inside & this should work fine.
If one were to put a mis-matched port tube in this 9.5 liters...it really wouldn't work right.....................Tell us how big/small a piping we have to use & I'll plug that number into the SIM.............& we will know how short to cut it, OK?
_______________________________________________________Rick.........
yes, 9,5l is a good choice. a few years ago a german speaker magazine built a "small" bass reflex version with this driver - it worked. mee too played around with that driver.
you can play around with data like boxvolume or Fb (e.g. 52Hz for an "extended" version ,or so..........).
yes,you can stick some soft material inside on the box walls (soft carpet,acoustic foam,....) - but not too much.
you can play around with data like boxvolume or Fb (e.g. 52Hz for an "extended" version ,or so..........).
yes,you can stick some soft material inside on the box walls (soft carpet,acoustic foam,....) - but not too much.
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Yep, i was looking at the wrong one... they have 9 different FR10.
The high Q makes it difficult to get a nice looking sim, there is going to be a bump at the bottom. The best looking curve i came up was 5 litres tuned to 65 Hz. We can call the bump baffle step. 38 D x 152mm long vent would do.
dave
In case there is still room for change / interest in alternative enclosures:
VISage (CT 271) » Donhighend Audio
The speaker is also featured in the current Klang+Ton.
Greetings from Germany
VISage (CT 271) » Donhighend Audio
The speaker is also featured in the current Klang+Ton.
Greetings from Germany
Thanks again for everyone's help. I cut some holes and put in some pipe. It turns out that I happened to have some around that was 50mm, but inside diameter is 47mm. The sound has changed a lot. There is now some bass, but a lot of sibilance and the midrange seems really pronounced to my untrained ears. I've read about cutting off the 'whizzer' so maybe I'll give this a try.
Not destroy as such. If you look HERE you can read about people that have done it.
As for the cheap amp, there's no doubt that's exactly what it is, but the idea is to have something that is acceptable, rather than pure hi-fi.
If this works out, I'm thinking about doing something a bit more ambitious next.
I'm going to put on some funky speaker covers, maybe I could tame the sibilance with the covering?
Visation FR 10 HM
Can we use the Visation FR10HM in a frugal horn?
Is there any modification required?
Thanks and regards,
Sumesh
Can we use the Visation FR10HM in a frugal horn?
Is there any modification required?
Thanks and regards,
Sumesh
