Axiom Home Page Forums General Discussion Home Theater Dual EP800 vs SVS Ultra 16

If I recall, it takes a doubling of power to earn a 3 db increase in signal. So having 6 db more in the 800 over the 500 is impressive and that is probably due to coupling of the dual drivers. But my math above has to do with RF radiated from an antenna and it might be different from audio SPL

Right on the 3 dB.

I made a mistake. Stacking two 500s will result in 6dB of increase. So if you stack two 500s, you'll get 114 anechoically and 124 in room which is the same as an EP800.

But you won't get the deep bottom end of the 800 as you know.

MOJO NOTES ON SET UP:

I removed the "third T" tonight. In other words, I moved the crossover point down from 150 hz which made for a Third T here and went to 80 hz... Houston, we have slam

Slim

Perhaps by allowing the sub to just work the 80 down frequencies, and not 'compete' with the stuff up to 150, the driver can operate quicker and give more of the tight bass feel??? I am not sure if a driver working half the frequency range can be more efficient.

That's very interesting. You should experiment with lower cross-over points as well. Unfortunately I've tried with mine and it's a no-go.

It's not a matter of the driver operating quicker because the frequencies we're talking about are very slow. It's more that the 500 is not enough sub to cover the entire spectrum for your large room but if you narrow the bandwidth, the power appears to be more than adequate. I would expect the majority to cross over 80 Hz or below.

I did, 80 hz seems (for now to my ears) work very well. I decided to let the Model T's be T's and not round them out. I am letting the EP500 be the sub and not try to be a T. I noticed the difference from the office in the house; the floor was beating to Timo Maas.

And this is not speaker break-in which I don't believe in. It's me getting used to the subtle sounds after two days.

If the driver is expected to produce all the range up to 150, that might take more power demand from the amp, hence a reduction in power being delivered to the "slam" frequencies. By rolling off the 80 to 150 hz range, it's leaving more for the lower frequencies upon demand. That could explain why I am feeling more in the other room. If there is a 3 db reduction in demand from the lack of using higher frequencies, then in effect you are doubling the power to the lower ones.

Please don't think that I know what I am talking about, I am not an electrical engineer! I am only asking questions of the in house professors.

I like that Shalamar. I bet it sounds fantastic with the Ts.

I turned my system up about as much as I can handle for a short bit but my 600 isn't really doing anything on that track. What about your 500?

Changing crossover points changes time alignment. You are only ever really in phase in a narrow band between the sub and speakers. You just got lucky and summed correctly when you dialed it down.

This is where being able to independently set delay comes in handy. With multiple subs you can create a quasi planar wavefront. This is how to max out impact from smaller subs.