4 LMS 5400s in my enclosures. Doable? - Page 3

Last night I finally got a chance to hear both enclosures in position. They make you giggle. Their low frequency efficiency, say 50Hz and down, is staggering. Nelly “Just a Dream” makes it tough to breath. Where they'll be a little power starved at above 50Hz(I think). Quick, punchy, signals are what tax the amp. No clipping with both channels running, but the amp is currently on a 20amp run and it’s looking for 30amps, so it tripped the breaker once and then I backed off. The electrician who did the 20amp runs said he used wire that will support a 240V run. That’s the plan, Kevin at Crown said that output and efficiency will increase significantly over the current run. I can’t imagine giving these things much more power, especially in the low frequencies. Excursion during the hard hitting low stuff looks to be about 2 inches P2P and they still sound beautiful. I’m pretty excited now and my concerns about the driver have faded. I’m not going to worry about their alignment right away. I’m sure they’ll be fine for a few weeks.

I think it was Scott who first recommended the LMS. Thank you, Scott

Excited to be here

Hi guys, I'm using fiberglass insulation for the woofers right now. How tight should I stuff the enclosures. I'm just filling the voids right now. No compression.

Also, I'll be laying them on their sides very soon. They are about 500lbs per enclosure, so I don't want to move them a lot. I'm considering laying them on carpets instead of the tile floor. I don't suppose that will affect the sound too much? Keep in mind that they vary (selector switch) between 100 and 120Hz crossover point, so there will be some directionality.

Playing with the subs. Noticing that kick drums clip the amp at significantly lower spl than lower bass tones. Could this be a property of the x-over/eq setup? The higher frequencies are still trimmed for the 21"s, but that would avert clipping, right, and the boost in the low end would promoted clipping in that band, right? Do these subs just take that much more do drive in the higher af?

I can't change the xover/eq myself. My friend will come do an impedence measurement and built personality modules, but before he does that I need to have the woofers in their permanent enclosures, so I'm kind of left to guess right now. Also, this weekend the amp will have 24Ov/15a instead of the120v/20a it has now. It easily tripped the breaker once, but I havent pushed it since. Will the mains change make a real difference, you think?

Thank you, Shan. Are you running one Ultra on the Berringer? What are your enclosure characteristics?

Hopefully I'll be able to permanently mount them tonight. They should sound noticeably better. The boxes were under stuffed and the adapter plates were just screwed. Plates are glued and screwed, foot holes are patched and sealed, and the enclosures are stuffed completely with fiberglass. Fiberglass is filling all voids but not packed in.

Thanks, Scott. They do look better in black.

Here they are.

Hey Justin, I'll definitely look into the Ashleys. My plate is full right now, though. I'm lining up a 65" Plasma, a NAD t175HD, and the room has needs to be addressed. I'm about $3500 in stuff away from more power. Visibly moving clothing is just gonna have to do for now :/

Yeah, that sounds about right. I haven't heard them for a week or so, but before I ripped them apart they were loosening up. The higher frequency clipping was still achievable but at higher SPL, and by the time any low frequency clipping occurred your clothes were moving and 10lbs lamps were thrown off the tables upstairs. My roommate ran down stairs screaming, "Everything's is falling down!".

The upgrade to 240V at 20amps should do. The Crown is doing what its spreadsheet claims as it snaps a 20amp breaker in a heartbeat. What's unknown is whether the clipping will lessen when it has its recommended mains, which will be nearly double what it has now. Sounds like the Crown runs best on 240V, as well.

An impedance measurement will be taken in a couple weeks and the LF personality modules in the crossover will be changed. That coupled with the amp having its recommended mains and the woofers being worn in should make a noticeable difference.

Like you a LG clone or even a real one would be nice, but that will just have to wait.

Well, guys, I'm happy to report that movie playback is great. I finally got a chance to watch some movies this weekend and the woofers sound awesome. At reference levels there was no clipping. Two prior instances of clipping were the sticky bomb explosions in Hong Kong in The Dark Knight and the thud during the opening of Inception. The entire system is pretty effortless at reference, and a lot of bass is revealed by the LMS's that the 21's missed entirely. No need for a new amp. The thud during Inception literally slaps the walls; the viewer feels like they are being hit. Scarecrow's voice during Who knows you're here? is startling. The amp is still running on 20amps at 120V. That will nearly double here shortly, so I see no need to spend thousands of dollars on another Crown, clones, or anything at all.

Best regards
Pat

Yeah, Wi, now to stop this house from rattling

I appreciate all the feedback and expertise you have all shared Thank you!

I’ll update you after the crossover is set. A Panasonic 65” plasma is also on its way, so there will be some new images to share.