The Timelapse Theatre - Planning n' Build Log - Page 22

Is that spray adhesive holding up your corner beads? I've never seen it done like that if I am in fact correct. Interesting.

It's nice to hear somone else quote you sometimes...I feel like all I do is ramble senselessly, but there just might be a gem in there once in awhile? I call it the shotgun approach. If you talk enough, somethings bound to make sense.

Regarding the sub amp: You may be aware of this, but the DIY community (from which your F20's were born) is fairly favorable of the Behringer EP series amps. It's what I use to drive two DTS10's. More power than you need, in a package that is bulletproof for residential use and for all of $300.

Maybe there is a reason to prefer the crown that I'm not aware of?

Interesting. Never heard of that, although I must admit I don't have my finger on the pulse of the corner bead market.

Carry on....

I would recommend reading the measuring amplifiers thread. Find an amplifier that matches your power needs at max output. This way you just have to watch for clipping. Keep the red lights out and know your safe. Use something with more power than those F20s can handle and youll do damage before you could hear them complain in a horn........

For example you could run them both off a single channel of an EP4000 safely, but wire them up to both channels and thats a recipe for disaster.

I like Berries, i even own one, but crown is a higher quality amp IMO.

I have no business discussing amps, just regurgitating what I've read really.

Hi Tony, Wasn't disagreeing with you.... I love my EP4000 they are the best bang for the buck in the pro amp category IMO.

This crown would certainly not overpower a pair of F20s wired in series for a net 8ohm load on one channel. Roughly 260W per sub and just keep the red lights from blinking. Doesn't lilmike suggest like 300W per sub?

This amp doesn't have dsp though, so count on needing minidsp or if your cheap and primitive like me a BFD at least.



However if It were me I would probably use the Behringer EP1500 stereo into 4ohms per channel for a net 400W per sub. I'd confirm on the F20 thread max power handling but from what I remember that power would be safe. Fan mods for these are easy and well documented to make them quiet and even 12V trigger mods too!

Agreed. He's certainly *IS* full of it!

The Behringers are great, I own two EP4K's. There are better, but not for the price. I'm not sure, however the Crown may roll off the infrasonic a bit sooner than the Behringer's. I believe the Berry high passes at about 5hz, however the Crown may begin it's roll off around 20hz.

How does this impact you? I don't know,..as I'm not familiar with those subs and their -3dB point. I'm not even aware of the recommended power,...I'd examine bottom octave measurements other successful/similar builds, and what amplification was employed. Be mindful if you're pursuing the "Nth" degree of extension, that roll off is accumulative. Will it ultimately matter at the LP,..I don't know. With the wondrous effects of PVG (Pressure Vessel Gain), one's bottom octave performance is certainly augmented.


Good luck

That's pretty much what the amp tech said to me yesterday. I originally wanted to get an Xti4002 for my IB because of the built-in DSP, but once I told him "what the hell kind of subwoofer" I have so that I was interested in anything below 20Hz, he recommended I go with something else, because the Crown has a built-in subsonic filter and the only way around it is to set the PEQ at 20Hz with a small Q and boost it to the max (12dB? 15dB?), but even then the Xti might not have much power down that low.
He recommended the t.amp proline 3000 (3kW). From a technological POV that thing is a bit outdated and heavy as hell (almost 90lbs), but simply amplifies what you feed it. If 1 Hz kills your speaker, it's your problem
I didn't really crank it up yet, but even at low volume the low end is much better than with the Crown XLS602 I temporarily used so far. I know it's a totally different league power-wise, but I wasn't anywhere close to the limits of both amps when I compared them.

So, if the decision is going to be between the Behringer and a Crown, I'd say go with the Behringer unless you know for sure that you can turn off that subsonic filter in the Crown. I'd recomment the t.amp over the Behringer, but I doubt that you can get them in the USA.

I believe the f20s are supposed to be high passed 18-20 anyways.....

150w ..?

Interesting, any model info, as I'm not familiar with any recent models, however they sold tons of 150w amps back in the day.

I really enjoyed listening to it! It was my first HT horn listening session. I'm used to horn subs from my musician days but I had never heard a horn tuned that low before. I was really impressed with the efficiency of the horn with only ~100W it was putting out some nice notes!

Double up with both horns and 150W each and it'll be louder than most people want to listen in there.....


Later, down the road if your bass hungry you could always upgrade amp and get another 3-6db but you might not even need/want.

I'll be drooling. please post pics...

Say goodby to updates, time lapse videos, and just about all signs of theater progress.

I'm betting that the last pictures we'll see is of the PJ then nothing.

Regards,

RTROSE

hang it....hang it....hang it.

Our good friend Tony is looking to make trouble...

We all promised not to do that yet somehow..........

One can lose many hours staring/watching silent movies, caution must be used. You my friend are treading very dangerous waters.

Regards,

RTROSE

Surely one little movie couldn't hurt?

^^^