Another subwoofer GTG, Southern style - Page 4

130/140db at what frequency?

small cabin, high tuning = very high spl.

meaningless in the home.

i know exactly what you mean when coming from car audio. although it has been awhile(1990), i built quite a few ported, bandpass, and dual bandpass(4th order) enclosures. that was back in the day when the orion hcca amps were the ticket since they were stable to 1/2 ohm and beyond. not that i'm wanting that kind of output in my home, but most of the commercially made subs are quite puny in my opinion. i would though like to have some of the impact that you get from using subs in a car. i think that is what most of us are really looking for... the visceral impact but without overbearing everything else. i really never cared for the sound from a sealed enclosure, so what about my idea using an 18" driver? i hope i'm not threadjacking here!

I'm interested in coming... I live in Huntsville, about 1.5 hours south. I only own a measly Outlaw LFM-1 Compact (3rd floor apartment). I do have a fairly nice camera so I'll be happy to photo-document, and I have a decent laptop. I don't have a SPL meter or microphone though.

-Will

Right now I am bringing my 6.5 CF Shiva-X and Nady XA1100. I will probably also bring my RS sound meter and lap top.

Brandon,

Were you planning on burning that 30min test disc? Were you going to put movie soundtracks on there as well or was it going to be music tracks only? I could do a music only disc but I'd need to know what everyone wants on there. I'd like to see some movie clips from Horton Hears a Who. There is some very nice low and loud bass through out that movie.

I'll bring my HK AVR-247 it has adjustable crossover points all the way down to 40hz for each channel. It puts out 50 watts per channel (all channels driven), is 7.1, and HDMI 1.3 capable (takes lossless PCM streams from Blu-rays and HD-DVDs, and i think it can accept bitstreams as well)

Sounds good. Horton is a kids movie but it is full of awesome bass including some 10hz and single digit stuff and good surround effects through out. It's worth buying. I'd like to have the Skidoosh scene from Kung Fu Panda on there if you have it. It's quick and fun.


I'll try to make the music cd in the next week. Track requests? If there's something you guys want on there, say so and I'll try to get it in there.

Brandon,

Can we get a few more pics of the room and possibly a floor plan attached to the first post? We can look at likely locations for placing the subs.

FYI, here is my sub (there are 3 different LFM-1 models, this is the compact)

http://www.outlawaudio.com/products/lfmcompact.html

If someone has something more powerful then feel free to bump me in favor of them...

I have some tc sounds epic 12. No box as of yet, but I could do something. Definitely the crown itech8000.

Bosso gave me a good idea through pm of bringing a mixing board to run all of the subs off of. We'll run the LFE out from the receiver into the board and then label the various channels and use them to set the levels for each SW prior to the listening evaluations. That way we can quickly just switch channels on the mixer. and it'll all be level matched. I'm already bringing a Xenyx 1202 for REW but I'll need another mixer to run the subs through. I have another one but I'd have to take it out of the rack I have it in currently. Does anyone else have one? I'll bring my second one if need be. We'll need a bunch of XLR cables as well. I can bring some of those too but I'd like to avoid dismantling the entire rig that my bands use. Robert don't you have some?

Brandon,

Sorry to keep pestering you man , but what's the word on that 220v line to your dryer? Is that confirmed and is it an option? Let me know what type of plug is on it if it is 220v, plus estimate how far it is to the listening area and I can whip together an extension cord.

this is awesome. just curios, will each sub be placed in the same physical location for listening in order to make sure everybody is hearing the sub and not random room modes?

will each be level matched +/-1db? if so, how?

just anticipating the kind of pushback on the results that is likely to come a posteriori.

Read the post above yours.

I will get the cables together tonight and tell you how many I have.

I have 12 xlr cables in my hands right now. I have more upstairs packed away. I will get them soon. How many do you need and how long. Some are super long and some are really short.

Guys I'm thinking that we find the best useable SW location in Brandon's room and listen to all of the subs from that spot. All subs should be calibrated to the same level relative to the mains and will use the same xover freq (100hz looks like).

I'd like to EQ each of the subs for the most extended flattest response as well, but I'm trying to think of a quick easy way to do that without spending 30min in between each listening session doing it and then calibrating the levels . Ideally we would do all of this prior to the listening sessions and everything would be set-up to just physically move the subs and switch a few cables and we'd be ready to get right back to listening evaluations. I don't see a way to do that without a dedicated EQ unit for each SW though. The Rane PE17 won't cut it for this. It can do the HPF's and level boosting, but it can only eQ one SW usefully (possibly 2 if one of them only needs 2 bands of parametric EQ, (by using 3 bands for one and 2 for the other and bypassing)).

I also have a DCX2496 that I could bring. Does anyone else have EQ units that they could bring for their sub? I guess I could always store the EQ settings for each SW on the DCX. PITA.











Awesome. Throw them in a bag and plan on bringing them I guess.

As far as seating should we bring some chairs? I have a collapsable chair that I use when watching my son play soccer.

You shouldn't need a separate smoothing EQ setting for each sub if your plan is to place them all in the same spot.

Signal shaping EQ (L/T, HPF, Le curve correction, etc.) should be a part of the subwoofer design and each entered into the fray as-is.

Bosso

I see where you are coming from here since all of the subs are in the same spot they will be subjected to the same room issues. I guess we could use a generic EQ setting if there is a bad peak from that spot it will affect all of them the same. Lets say that I want to bring the DCX to do a 20hz shelf and boost up the <20hz area of the sealed LMS and XXX (a possibility) and someone else has a sealed sub but no LT circuit or other means to boost it up?

Well then count my sub out, if that is how it will be done.