Hey guys, I have been browsing the forum for some time now, and decided to share something I'm working on.
I am currently building a 2.1 channel system for my room, and the sub is on of the first things I am attacking. I decided to do a compound isobaric design to see how it performs compared to other setups I have tried with these woofers.
I am using 2 Hivi M8a mid-bass woofers, in a 1.5 cubic foot box (1.45 after displacement) It is vented with a 6 inch by 1.5 inch slot, tuned to about 33Hz. The box is made from 3/4 inch MDF, which I will never use again.. I will be finishing the box next weekend, which includes routing out the port, and rounding the ends, and the outside of the box. I haven't decided what I'm gonna do to it to make it pretty yet though, any suggestions?
I will be building a 120 watt amp to power this little beast, tinkering with the idea of making it an active sub. I haven't had any decent play time yet, listening to it with an LM3875 amp that clips at about 25 watts isn't doing it much justice...
I used WinISD to help with the design, I have attached a screenshot, and I have also attached a few shots of the woofer, and then obviously the box itself.
I am currently building a 2.1 channel system for my room, and the sub is on of the first things I am attacking. I decided to do a compound isobaric design to see how it performs compared to other setups I have tried with these woofers.
I am using 2 Hivi M8a mid-bass woofers, in a 1.5 cubic foot box (1.45 after displacement) It is vented with a 6 inch by 1.5 inch slot, tuned to about 33Hz. The box is made from 3/4 inch MDF, which I will never use again.. I will be finishing the box next weekend, which includes routing out the port, and rounding the ends, and the outside of the box. I haven't decided what I'm gonna do to it to make it pretty yet though, any suggestions?
I will be building a 120 watt amp to power this little beast, tinkering with the idea of making it an active sub. I haven't had any decent play time yet, listening to it with an LM3875 amp that clips at about 25 watts isn't doing it much justice...
I used WinISD to help with the design, I have attached a screenshot, and I have also attached a few shots of the woofer, and then obviously the box itself.
Attachments
I would have, but port length would have been too long in this small of a box with that size slot, and any smaller and the port noise would have started to become noticeable. I decided to just do a regular vented box in the end, as one of my woofers make an awful noise.. I think I damaged the voicecoil from when I got a little crazy with them in the last box (1/4 wave t-line)
Okay so I finally got the time to work on the sub some more, and this is where I am at.. I have yet to add any 45's, still have some more testing to do with foam/stuffing, and some more cosmetic work.
WinISD puts the -3dB point at just under 31Hz, and so far testing shows pretty close to that. I dont have any real equipment to measure it though.. So far it is matching with my mains fairly well, and can surely make things shake if you need it to.
I am debating between spikes or foam to isolate it from the floor, anybody have any advice there? More updates to come in the next few days.
WinISD puts the -3dB point at just under 31Hz, and so far testing shows pretty close to that. I dont have any real equipment to measure it though.. So far it is matching with my mains fairly well, and can surely make things shake if you need it to.
I am debating between spikes or foam to isolate it from the floor, anybody have any advice there? More updates to come in the next few days.
Attachments
???
sreten, you have any links to examples? First I have heard of this and I am curious to learn more.
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