Which Option?? For Sealed DIY

[Jeff R.]

Guys

I got the OK to spend roughly $500 on a DIY Sub project. Right low I really want to stay with a sealed box at this point for easy of construction, but from what I have read all these subs will be ideally put in a sealed box.

So here is the best options I have come up with.

1) 2 Epic 12's from TC Sounds, Roughly $400 for both subs and a $100 for materials.

2) 2 Dayton 15: Titanic MKIII, Roughly $460 for both subs and a $100 for materials

3) 1 LMS-R 15 from TC Sounds, Roughly $430 and $100 for materials.

Right now I am leaning toward the 2 Titanics. What do you guys think. I will running them off my Adcom Amp, so I should have about 500 Watts to each sub at 4 ohms.

Any advice would be greatly appreciated. This will go into my main HT setup. However will likely be about 60% Movies/TV and 40% Music.

Thanks

Jeff

 

[templemaners]

Search the DIY forum for talk about Infinity 1260w and 1262w drivers. You can get the 1262's as low as $47 each. Jinjuku has been messing around a lot with those drivers lately, so he's the one to go to w/questions about those.

 

[j_garcia]

You're going to build duals or a single twin driver sub?

 

[Jeff R.]

2 separate boxes if I go with 2 subwoofers. So I can balance room response better.

 

[jinjuku]

Commencing a build with the 126Xw's. There will be a total of eight drivers in four 3.0 cubic foot sealed enclosures in a dual opposed configuration.

Calculations with 2800 watts all in put 20Hz depending on configuration at 112-115dB.

Temple, I haven't seen them listed for $46 since. Quite the snag you made.

 

[ahblaza]

Sounds like duals to me: " I'll be running them with my Adcom amp, should have about 500 watts to each sub at 4 ohms. I don't know.....could mean to each driver in single cab also?
Sorry for late reply......

 

[ahblaza]

Commencing a build with the 126Xw's. There will be a total of eight drivers in four 3.0 cubic foot sealed enclosures in a dual opposed configuration.

Calculations with 2800 watts all in put 20Hz depending on configuration at 112-115dB.

Temple, I haven't seen them listed for $46 since. Quite the snag you made.

Jin,could I be included in the recipient list?

 

[Jeff R.]

The Infinity could be an option. I am not sure I could swing that big of a scale build, I could likely do a pair of these designs.

Would that be able to beat a pair of 15" titanics in output?

 

[lsiberian]

I'd get the single LMSR-15 and maybe add another later if I needed it. If your room isn't large be warned 2 Epics can do violent things to your body. My single sub is very close to the Epic design and it delivers insane bass.

You will need a power amp like an EP4000 for this amp. A Plate amp won't cut the mustard with TC.

 

[templemaners]

How big of a box were you looking at Jeff? Two Infinities or one 15" LMS-R fit pretty well in a 3 cu ft. box. Not sure how big of box the Titantics need, but I thought the Epic 12's model pretty well in 1.5 -1.75 cu ft boxes...

 

[templemaners]

Commencing a build with the 126Xw's. There will be a total of eight drivers in four 3.0 cubic foot sealed enclosures in a dual opposed configuration.

Calculations with 2800 watts all in put 20Hz depending on configuration at 112-115dB.

Temple, I haven't seen them listed for $46 since. Quite the snag you made.

I haven't seen them for that price again either. Must have been the floor pricing wise. I consider it karmatic payback for my Denon 4311.

 

[Jeff R.]

I was thinking about that size roughly 3 cubic feet for the Titanics also. I going to just use something very similar to what the titanic DIY kit would have come with.

I have not modeled anything yet. I am still in the brain storming phase. I just know that I would like to stay sealed boxes if possible.

 

[jinjuku]

Would that be able to beat a pair of 15" titanics in output?

An opposed Infinity would probably be close in output vs single sealed Titanic. Maybe 1dB more, 1.5 perhaps.

I think it could be cleaner however and for the $233 that a Titanic costs you could pickup four of the 126Xw's do two sealed dual opposed subs and $200 in the bank and not have sacrificed SQ.

 

[Jeff R.]

Would my receiver have a good enough bass management...se.e my sig. Would i need an additional piece of gear.

Thanks.

 

[jinjuku]

Would my receiver have a good enough bass management...se.e my sig. Would i need an additional piece of gear.

Thanks.

I would see what the room response is with two subs and then make a decision on additional external EQ.

 

[Jeff R.]

What kind of low end will I likely see with a pair of your suggested builds jinjuku? I will be replacing my dual A2-300's with this pair, will I be able to get down to the low 20 hz range? Could my GFA-555 power a pair of these reasonably well. Like I stated I should be able to push 500 watts to each sub at 4 ohms. If I were to drop to 2 ohms technically I believe I can push about 800 watts based on what I have read. I am not sure it is a good idea to have my Adcom running at 2 ohms though. What do you think?

Thanks
Jeff

 

[jinjuku]

A single dual opposed will hit around 104dB at 20Hz slightly under x-max. Two of them will hit around 110 stacked or 107 co-located.

Not bad for $240 in drivers. Each driver is rated 300 Watts RMS so if you are giving each single driver 500 watts you should be fine. Is your Adcom rated for 2 Ohm operation?

 

[Jeff R.]

I do not think it is designed to be run at a continuous 2 ohm load. I can bridge it to mono mode and push 850 watts RMS to a 4 ohm mono load.

 

[jinjuku]

I do not think it is designed to be run at a continuous 2 ohm load. I can bridge it to mono mode and push 850 watts RMS to a 4 ohm mono load.

That would work....

 

[jotham]

Infinity vs Dayton Titanic

I've assembled a couple of subs using older Infinity Perfect 12" subwoofers and Dayton Titanic MKIII subs. I first started out with sealed 3 cubic foot boxes but I eventually ended up porting them for the significant increase in clean output.

I'm far from an expert but here's what I noted in my builds.

One, I really like the Parts Express subwoofer enclosures, especially the black vinyl as they are easy to customize, look clean and hide well in the room. That said, 3 cubic ft is still pretty big.

Two, for whatever reason, my infinitys seem to have greater clean output and break up less under serious stress. You can pick up an Infinity 120.09W 12" sub which looks quite similar to the older Perfects for about $130 at amazon (and other places).

Three, porting either sub in a 3 cubic foot enclosure works great without sacrificing a nice response curve. I used WinISD and for both of those drivers, I typically ended up using two 2" flared ports running approx 11" long (if I remember correctly). You would have to model it with whatever drivers you actually went with.

In summary, with your budget, I would build just one box with the Infinity 120.09W sub, two 2" Precision Ports, some binding posts, polyfill, etc. I think you would be really happy with the end result. I will say that my Infinitys can certainly demand amp power but they also seem to handle it well.

Of course, if you are a better woodworker than myself, you could certainly build your own sub box and save some cash.

good luck!!

Jotham
P.S. Re-reading all the preceding posts I realize that I went off topic a lot. What I was trying to say is that pound for pound, I've had a better experience with infinity subs in very similar builds. I would (and have) build at least two separate enclosures with infinity subs and not use a Dayton MKIII. Infinity subs behave very well sealed but I feel that a mild porting has all benefit with no downside (that I can hear).