A little help getting started with sub build for HT

Hey, got a little problem. I have been modeling a couple speakers as best as I can, but I have worked myself into a stupor. I have an odd sized room, and placement of the woofer is more or less dictating what I can do. Here is what I mean:


Behind the chair is where I currently have my sub. It's a sony htib sub that I have had for 10 years. The reason I put it there is because I dont have much room up front.

The room is 18x18 with highest wall 16 ft.

Pardon the mess, in process of painting. Anyways, I hear its preferred to have the sub up front firing towards you. But I don't know if its the room size, or just this crappy sub but I found it sounds best in that corner i showed. So I have ran wire in wall to that location. Guess I would prefer the sub to be there, but it cant be too big. Is it a good idea to have it right against the wall? If so, in that corner, I could get away with about 20w x 20d x 22h. If it is best for it to be out from the wall 6 inches or so, that cuts my size by that much.

I put an order in for the dayton rss390HO saturday, but cancelled the order last night becuase now i'm thinking maybe a smaller sealed box with a dayton 12HF/HO? and a 15" dayton passive rad. This is my first build, and I guess going PR is a bit more complicated, but I'm sure I can figure it out with a little help.

I will be powering with the parts express bash 500, that I already aquired. Question about that amp, anyone know the stock hpf? Thats another reason I had trouble modeling, I didn't know what tune to choose. I want the lowest possible for HT of course.

Another thing that may be an option, is an endtable build, putting it next to sofa where current table is. That would let me get away with a much larger box, but I'm unsure about the effect this creates. I will use this for 99% movies/tv, and don't want it to be totally obvious. If I crossover around 60hz, maybe this will become less of an issue? It's just that that seat next to the table is my preferred seat.

Thanks for any help guys, I really could use it!

Cheers!

Hey thanks man! With the end table how close were you to it when seated? And does it distract you at all. I just don't want to be thinking about the sub when I'm trying to get into a movie.

How about an epic 12 in about 3.2ft^2 with a 15 in passive? I think I could tune that pretty low but again I am not sure of my bash 500 hpf. I read somewhere that its around 18. Although the epic 12 may be enough without the PR.

I'd like to get er done under 250, minus material. Max size for end table 24" cube-ish. If in corner it needs to be under 21.

28x18x25 would be the max outer dimensions for an end table. Using 3/4 MDF, doubled baffle will probably net 5.3-5.5 ft^3.
I'm a little unsure how an end table will blend though. I suppose if it doesn't sound right I could move it over closer to wall and find another place for lamp. Sheesh, decisions like this are were much easier when I was a bachelor

Ok I've done some modeling with the RSS315HF. Could anyone tell me if these look good?

This is where I'm thinking of putting it for now. I could eventually put another on the other side of the sofa, depending on how this sounds.


I tried entering the parameters of the speaker myself, but then downloaded one already done on the HTS forums. For dunno if i did it wrong, or the one I downloaded is wrong (likely the former) but I had two different results. So the pics are of one I found on the forums. Why is there a 5-6db dip around 26hz? Did I do something wrong?

When I have put in winisd to use two ports, do I divide the port length it tells me or is the length for each port?

Tuning is for 19 hz, And I guestimated around 6.5 ft^3 after subtracting for stuff inside. From what I've found my bash amp either has a rumble (hpf?) at 30, or if its a newer one, around 19. I found a good chart so I will mod it as needed.

Or perhaps it would be better with the rss390hf?


Thanks for helping a dumb noob! I really want to get this box done before family visits thanksgiving to get a little reaction

Well, I hope to have a similar experience . Though I'm surprised he was able to get away with such small ports.

Anyways I'm starting the build tomorrow. I am going for a 22hz tune in 5.5ft. Amp will be a young 300 since my bash is fried. Oh well, sure it will be more than enough...for now.

Just wanted to thank you guys for the help.JPM, Nograveconcern, LTD, much appreciated! Finished it up this weekend. Well, still need to figure out how I'm going to finish it, but I can take my time with that and make sure it is exactly what I want. I'll post final pics when I do get to it. Here is where it stands now:





Not sure if I like the feet. I used hurricane nuts to attach them so I can easily change them. Thinking oak veneer stained dark mahogany or ebony. So yeah, sounds just a little better than the sony sub Haven't gotten to test it as much as i'd like, but i'm sure this will get me by. Next thing to do is figure out REW and see how good I can make everything sound as is. Then maybe look into building new L/C/R speakers

Again, thanks for the input!

Chris

Thanks, LTD! Yeah, the more I look at the sub it starts to resemble an elephant on stilts Thanks for the suggestion, I'll definitely keep it in mind!... the furniture suggestion that is... the tapestry might just cause the wife to go medieval on me But yeah, I'm already looking around trying to find ways to discretely add some sound deadening in this room.