lukeamdman

You should see my in-room impedance measurements when someone walks across the room above my HT.

Make it up to me by bringing over a XLS-5000

Dude did you already sell this thing?!

stormwind13 might be bringing over a "Monster Power" brand amp for testing, and apparently the factory specs are underrated so it should be interesting.

Nice!

Ricci/Kyle, can this thread be pinned? Maybe replace the "new forum for bass gear" pinned thread?

Sorry no. My testing rig is limited to 2 channels.

Sadly, I know people that would fall for that.

You and that guy from b&c would hit it off.

Yeah man, and that was at the MLP about 15ft back. Room gain! Also, the mic is only rated for 146db, so it may been a little louder than that. I have a new mic on the way that's good for about 170db.

Bass.......

SpeakerPower...

Wire them in a series and bridge the clone...or buy a speakerpower

DANG!!

Eh. You'd get more SPL and better response with two PB-13 Ultras.

jiminy christmas

I remember when a Bose Acoustimass module with two 5.25" drivers put a big grin on my face. Later I thought a 12" Velodyne was just insane...then a 15"...then a 18"...then two 18s...etc...etc...etc. When I have GTGs and I see people's first exposure to 130db and now 140db I remember reacting that way but it doesn't last. I mean seriously, on the boards now days there's nothing special about a 8x18" system. Crazy.

Awesome! I'm glad some of these tests were useful. There's a lot of debate about how or even if these tests translate to real world use, but regardless of that one of my main goals was to test all the amps under the same conditions for comparisons sake. Before I tested the Crest CC amps I knew their 10hz and below performance was sub-par based on experience with sealed subs and real content. This amp testing confirmed my findings. There are many other examples of this but bottom line I've found how the amps perform during this testing to correlate very nicely to real world use.

This is custom amp that Dustin bought off Craigslist. I don't remember the cost, but it may have even been free! Dustin took it apart and it appears to be two plate amps put into a single enclosure. The front of the box has crossover and gain controls for each channel, and the back has phase and an RCA input for each channel. Each side has a very large aluminum heat sink. Under 20hz the amp has pretty severe roll-off on its inputs. From 20hz to 10hz, and I had to increase the main volume by almost 20db! At 5hz, even by just 30Vpp of output on the amp, I was at +10 on my preamp and output clipping was starting on the RCA output of the preamp. The 5hz test was aborted for that reason. I didn't test the output with both channels driven simultaneously, but both channels driven independently had exactly the same output down to the single volt.

Just got a weird amp from Dustin to test. We call it the "cube amp". I'll post some pictures later.

Disgusting.

You'd think there'd be a way to use some type of ceramic material to coat the VC vs. glue. I think I remember Nick from SI saying even the best VC glues will melt around ~450-500F. The Kilns used to make ceramic pottery get up around 1,800-2,400F, so I highly doubt any amount of a heat from a VC could damage it. Ceramic tiles protect the space shuttle from re-entry for crying out loud...talk about heat dissipation! I suppose when the coils heat up and expand it'd just break/crack ceramic material? Maybe some sort of Artic Silver type of "filler" could be a buffer between the coil and ceramic shell? Could that be done without creating air pockets?

Motu Ultralite AVB. Line out to mic in:

I cleaned up the first post and have links to all the amp tests now.

That sounds expensive...