hdf
you dont really notice by looking at it but just try to pic it up! its got a harder finish because of its density. I dont see it too often.
you dont really notice by looking at it but just try to pic it up! its got a harder finish because of its density. I dont see it too often.
The MDF that is usually used for speakers and cabinets is called ultra light. It is widely used because even though is pretty heavy, is lighter and easier to handle than HDF. We sometimes used it (not that much) to make radiator covers, cabinet doors and even cabinets.
HDF is darker and is a lot heavier. It is not a bit denser, it is a lot denser. If you want I can post a pic showing both so that you can see the difference. (It looks lighter in color in the pic, but you'll be able to tell the difference in a pic with both side by side.)
I live in NY, so I can get it in many places. I usually get it from a place called "Manhattan Laminates," or "Dykes Lumber." You should specify that you want the regular one and not the ultra light.
There are also different quality of MDF/HDF, But that's another story.
ocool_15,
Thanks for joining the groups thing. I recently found out that this was a service that came with the msn subscription. I just created it to show off pics and to post questions which hopefully, someone will join and answer. But with forums like this one, it is not needed. You can post a question there if you want, to see if some joins and answers it.
HDF is darker and is a lot heavier. It is not a bit denser, it is a lot denser. If you want I can post a pic showing both so that you can see the difference. (It looks lighter in color in the pic, but you'll be able to tell the difference in a pic with both side by side.)
I live in NY, so I can get it in many places. I usually get it from a place called "Manhattan Laminates," or "Dykes Lumber." You should specify that you want the regular one and not the ultra light.
There are also different quality of MDF/HDF, But that's another story.
ocool_15,
Thanks for joining the groups thing. I recently found out that this was a service that came with the msn subscription. I just created it to show off pics and to post questions which hopefully, someone will join and answer. But with forums like this one, it is not needed. You can post a question there if you want, to see if some joins and answers it.
Greets!
HDF = hard (or high) density fiberboard, AKA 'hardboard' or 'Masonite'. Density of MDF/HDF varies, but 50lbs/ft^3/80lbs/ft^3 is the norm here in the Deep South, so 'a lot denser' is indeed apt. 😉 If you think MDF is tough on cutting tools/dusty, steer clear of equivalent thickness HDF. Since HDF is somewhat stiffer (higher MOE) though, it doesn't need to be quite as thick to match MDF's, so in general one size thinner HDF can be subbed.
GM
HDF = hard (or high) density fiberboard, AKA 'hardboard' or 'Masonite'. Density of MDF/HDF varies, but 50lbs/ft^3/80lbs/ft^3 is the norm here in the Deep South, so 'a lot denser' is indeed apt. 😉 If you think MDF is tough on cutting tools/dusty, steer clear of equivalent thickness HDF. Since HDF is somewhat stiffer (higher MOE) though, it doesn't need to be quite as thick to match MDF's, so in general one size thinner HDF can be subbed.
GM
I got one last question.
I don't know anything about filters so please be specific, but not too technical if possible.
If I need a filter to prevent over excursion of the driver below tuning, do I have to make it? or can I purchase it somewhere?
How difficult will it be to make one?
Thanks
I don't know anything about filters so please be specific, but not too technical if possible.
If I need a filter to prevent over excursion of the driver below tuning, do I have to make it? or can I purchase it somewhere?
How difficult will it be to make one?
Thanks
filter
generally the subsonic filter is built into your amplifier, I did see one once on ebay/ 1 company offered. I don't believe it was variable.
generally the subsonic filter is built into your amplifier, I did see one once on ebay/ 1 company offered. I don't believe it was variable.
If you can't buy one, they're not that hard to make.
I model mine in WinISD to pick the design frequency. You can see the details here:
http://www.users.bigpond.com/bcolliso/active-filter.htm
regards
Collo
I model mine in WinISD to pick the design frequency. You can see the details here:
http://www.users.bigpond.com/bcolliso/active-filter.htm
regards
Collo
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