A few points:
- 3db looks like it's above 100Hz
- Crosover will obviously change slightly once you have the drivers in the final enclosure.
- 3db looks like it's above 100Hz
- Crosover will obviously change slightly once you have the drivers in the final enclosure.
hi vikash,
thanks for your comments 🙂
I dont think they are as big as the renders make them look- if i get round to doing any more (the full size version of that render above is 12 megapixels and took my athlon 3200 6 hours last night hehe) i'll put a chair or some cd's in the scene to give some scale, They are abouut 900mm tall with bhoth enclosures, and the small 2-way enclosure is approx. 300x190x320mm, so comparable to say a kef Q1.
The bass enclosure is 440mm deep, but has been designed to go right up against the wall as the binding posts are on the side- so wont stick out into the room any more than a typical floorstander.
I know what you mean about the "imposing" nature of the design 🙂, but they are intended as a bit of a statement product- plus a minimalist box wont stand out at the degree show in june 😉
The bass thing- prob best to ignore that part of the graph- ive been listening to the test boxes and there is definatly no shortage of bass- theres good output down to the low 40hz region and if anything i might have to bring the mid and tweet up a bit to even out the balance. Certainly they have much weightier and tighter bass than what i'm used to. Doing basic frequency sweeps on winisd it sounds pretty much flat from there up to 1khz, allowing for room modes etc.
thanks for your comments 🙂
I dont think they are as big as the renders make them look- if i get round to doing any more (the full size version of that render above is 12 megapixels and took my athlon 3200 6 hours last night hehe) i'll put a chair or some cd's in the scene to give some scale, They are abouut 900mm tall with bhoth enclosures, and the small 2-way enclosure is approx. 300x190x320mm, so comparable to say a kef Q1.
The bass enclosure is 440mm deep, but has been designed to go right up against the wall as the binding posts are on the side- so wont stick out into the room any more than a typical floorstander.
I know what you mean about the "imposing" nature of the design 🙂, but they are intended as a bit of a statement product- plus a minimalist box wont stand out at the degree show in june 😉
The bass thing- prob best to ignore that part of the graph- ive been listening to the test boxes and there is definatly no shortage of bass- theres good output down to the low 40hz region and if anything i might have to bring the mid and tweet up a bit to even out the balance. Certainly they have much weightier and tighter bass than what i'm used to. Doing basic frequency sweeps on winisd it sounds pretty much flat from there up to 1khz, allowing for room modes etc.
A very promising student !
Hi Lufbrafmatt,
My sincerly compliments.
I suggest you, If I can, familiarize some months with your second order x-over and then, If you will have time, to try first acoustic order.
Not easy, but possible.
Flat all at 83dB and cut 300 and 4000Hz . No fear about no-perfect off axis, lobing, power handling etc. , Your ears will be happy 😉
Yust my opinion,of course.
Cheers,
Inertial
Hi Lufbrafmatt,
My sincerly compliments.
I suggest you, If I can, familiarize some months with your second order x-over and then, If you will have time, to try first acoustic order.
Not easy, but possible.
Flat all at 83dB and cut 300 and 4000Hz . No fear about no-perfect off axis, lobing, power handling etc. , Your ears will be happy 😉
Yust my opinion,of course.
Cheers,
Inertial
hey !
very very classy, i much prefer the new cabinet design, compared to the old one, and i see that you implemented time alignement if i'm not wrong.
This looks like a wonderfull speaker project, keep us informed !
very very classy, i much prefer the new cabinet design, compared to the old one, and i see that you implemented time alignement if i'm not wrong.
This looks like a wonderfull speaker project, keep us informed !
hi nemophlye, thanks for your encouragement, much appreciated 🙂
yes you are right- i took heed of comments made here and have used the redesign to implement alignment of the "acoustic centers" of the drive units by tilting the baffles and setting the MT unit back from the bass unit slightly, as a result all the drivers are aligned to within a few mm based on a 2.5meter listening distance and a typical sitting height.
Thats the great thing about using a 3D CAD program like ProEngineer- i can see quickly and easily how to change things by just putting a few construction lines over the model and see in real time how changes in angles and part sizes will affect the product 🙂 And because the models ive shown here aqre made up from separate parts assembled as they would be in real life (not just a "skin" like a 3D Studio Max model) I can generate engineering drawings and CNC code directly from the CAD model, makiing them much easier to make.
yes you are right- i took heed of comments made here and have used the redesign to implement alignment of the "acoustic centers" of the drive units by tilting the baffles and setting the MT unit back from the bass unit slightly, as a result all the drivers are aligned to within a few mm based on a 2.5meter listening distance and a typical sitting height.
Thats the great thing about using a 3D CAD program like ProEngineer- i can see quickly and easily how to change things by just putting a few construction lines over the model and see in real time how changes in angles and part sizes will affect the product 🙂 And because the models ive shown here aqre made up from separate parts assembled as they would be in real life (not just a "skin" like a 3D Studio Max model) I can generate engineering drawings and CNC code directly from the CAD model, makiing them much easier to make.
nice speakers...polymer construction? good idea...here's another example...a little more subtle than yours but beautiful too. I think you'll be surprised when you receive the cabinet quote 😀 it's not cheap!!
An externally hosted image should be here but it was not working when we last tested it.
sphinx said:
For my project ive effectively had to design two versions of the speakers- one that I can prototype myself and another version that would be made for commercial sale. Ive fully costed up how much a moulded polymer enclosure would cost (doing a degree in industrial design+technology- it isnt all arty farty stuff!) and its a lot less than you would think- even at the low numbers loudspeakers are manufactured in compared to say TV's, the mark-up on audio equipment is rediculous.
My versions will use fiberglass shells, with the bass enclosure having a double skin- the cavity between them being filled with sand to add mass and absorb vibrations. The moulds for the fiberglass are nearly finished and im hoping to get some mouldings off at the end of next week, might be a bit tight tho as its the easter holidays after next week. The wood i need (all birch ply 😀) is getting deilvered on monday so i can start work on the internal bracing system (think B+W matrix) and the baffles.
On a side note, does any one know where i can get some thin aluminium plates either laser or CNC engraved, or printed, with some text to go behind the binding posts?
The laser cutter/engraver we've got here at uni can't do metals, and although I could CNC mill them fairly easily it takes a while to set up and I cant afford the time, getting them outsourced is much less effort 🙂
matto 🙂
This is a neat concept. But for speakers that size, it's probably best to get then to go as low as 40Hz -3db.
soongsc said:
Ignore the bass end of the graph above, the room i'm in is coffin shaped and has got some weird stuff going on under 100hz- the 8 inch scanspeaks definatly go quite low 🙂 Theres strong output down to 40hz and usable output down to around 35hz- the sealed box rolls off slower than the equivalent ported enclosure, and to my ears sounded better when i made some rough test boxes. If anything they are too bass heavy and i might have to bring the levels of the midrange and tweeterup a little bit.
Finally my digicam batteries are charged up . . here is a shot of the mould for the small upper enclosure of the speakers, next to an old mission 760 for size comparison. The blue/orange speckles on the plaster mould are the remains of the guide coat to help me get the plaster smooth. Next step is to give it a coat of reface 2-part spray filler which will seal the plaster and enable me to polish it to a high quality finish.
This mould will be used to make a GRP female mould, which in turn will be used to make two GRP enclosures for the speakers.
This mould will be used to make a GRP female mould, which in turn will be used to make two GRP enclosures for the speakers.
Attachments
Member
Joined 2002
some more progress pics- this 9 till 5 inn the wood shop lark is wearing me out!
Nearly got all the ply cut out, been annoying all the second years that want to sit in the workshops and chat with hours of constant jigsawing noise hehe
the plaster mould for the bass enclosure is coming on, just seems to be a bit of a bear getting it symettrical. Got a cardboard jig thats made from 1:1 print outs of cross sections through the cad model to help me out tho.
Nearly got all the ply cut out, been annoying all the second years that want to sit in the workshops and chat with hours of constant jigsawing noise hehe
the plaster mould for the bass enclosure is coming on, just seems to be a bit of a bear getting it symettrical. Got a cardboard jig thats made from 1:1 print outs of cross sections through the cad model to help me out tho.
Attachments
and the plywood inner shells of the bass enclosure have been laminated up from 1.5mm ply over an MDF former (which will be removed tomorrow when the glue has set). I got one off yesterday and i cant beleive how stiff it is! once this is all braced up and the cavities in the wall filled with sand the enclosure should be really dead:
Attachments
hi guys
just for anyone thats interested, i've been back in the workshops making some good progress on this project. The woodwork side of things is nearly all done, all the internal bracing and the baffles is made from 18mm birch ply- i cant believe how much nicer it is to work with than MDF.
Heres a pic taken at the end of today, one of the baffles of the bass cabinet is vurtually done, with the other one waiting to be sanded down. Good job my department have the mother of all belt sanders . . .
Lots have people have commented about the stripey effect as a result of sanding back into the plywood- it does look kinda cool but im afriad they're going to get a coat of the ubiquitous shiny black 😎
just for anyone thats interested, i've been back in the workshops making some good progress on this project. The woodwork side of things is nearly all done, all the internal bracing and the baffles is made from 18mm birch ply- i cant believe how much nicer it is to work with than MDF.
Heres a pic taken at the end of today, one of the baffles of the bass cabinet is vurtually done, with the other one waiting to be sanded down. Good job my department have the mother of all belt sanders . . .
Lots have people have commented about the stripey effect as a result of sanding back into the plywood- it does look kinda cool but im afriad they're going to get a coat of the ubiquitous shiny black 😎
Attachments
Those look superb matt.
The stripey thing with the ply helps to gauge the smoothness and symetry of the baffle shape.
As comicbook guy from the Simpsons said:
"Best DIY loudspeakers ever" 🙂
The stripey thing with the ply helps to gauge the smoothness and symetry of the baffle shape.
As comicbook guy from the Simpsons said:
"Best DIY loudspeakers ever" 🙂
hi ant
cheers for ure comments 🙂
The stripey thing going on with the ply is indeed useful for sanding, acts just like contours on a map. The dimensions are exactly the same as the last rendering i posted up a page or so back- and the engineering drawings were generated from that same CAD model; the woofer is still a scanspeak 8555-01, so i think it must be the exagerated perspective caused by the camera lens being zoomed right out. I know what you mean though, the hole does look big in the photos.
cheers for ure comments 🙂
The stripey thing going on with the ply is indeed useful for sanding, acts just like contours on a map. The dimensions are exactly the same as the last rendering i posted up a page or so back- and the engineering drawings were generated from that same CAD model; the woofer is still a scanspeak 8555-01, so i think it must be the exagerated perspective caused by the camera lens being zoomed right out. I know what you mean though, the hole does look big in the photos.
- Status
- Not open for further replies.