I was wondering if anyone knows what the crossover slope is on the EP600. I have recently purchased a Hsu MBM-12 and I am trying to figure out if it would be better to crossover the 600 at 40hz or 60z (currently at 60) The MBM has a high pass of 50hz and since that is not an option I am trying to figure out eh best way to blend these two.

If you are using the crossover in a receiver what would that matter? The crossover in the 600 would be bypassed.

exactly Rick, the receiver handles the bass management and the 600 should be bypassed.

Well that's the thing with integrating an MBM, it is designed for 50-150hz I set the controller's crossover to whatever I wnat the maximum frquency of the MBM to be and then adjust the 600 crossover to cover the 50hz and below. Knowing the slope would help, but I can use an SPL mic and REW to play with it and adjust as needed.

you would be better allowing the 600 to handle the full range set by bass management, which would give you a flatter frequency response within the room using multiple subs.

I guess you could call Axiom to get your answer, but I would want to use the full capability of the 600 WITH the MBM.

What mains are you using?

Monitor Audio RS8

Those are some fine speakers there. I'm sure they handle anything below 80hz just fine. I would set the crossover at the appropriate setting (whatever you find best) and just over lap the mbm and 600 by 10 to 20 hz.

I believe a year or two ago, a brick-wall filter was implemented for EP500 at 150Hz (and any of its other settings?). If the 600 has the same brick-wall filter, you will not get a slope (i.e. a smooth transition on the 600 side) at the set frequency on the 600, so as Wid and Sirquack have suggested, it is probably best to keep the 600 at 150/bypass and let your processor/receiver apply the bass management and slope on its side. Doing this would allow you to slope into MBM and 600.

John, I think your right, sometime mid year 2008 I believe new 500's and 600's hitting the market eliminated the brick wall filter...

So, did they go from no brick wall to brick-wall, then back to no brick-wall?

I believe, the DSP subs always had a brick wall till the EP400 arrived, then they modified the DSP for the EP500/600 to match it and it went into use in late 2007, early 2008.

Pardon my ignorance fellas (I am old you know), but what is and what is the purpose of the brick-wall filter you are referring to?

It means the crossover has a practically vertical slope, i.e. if you set it to 80Hz, essentially no material above that is played by the sub. Typically, crossovers have more gradual slopes.

Oh I gotcha, thanks Peter.

That's what I was afraid of, my EP600 is older and I know even set to bypass it has an wall at around a 100hz anyway. Part of my interest in the MBM. As far as I could tell if I set crossover to 40 or 60hz the frequncies above were basically completely gone. If I am correct, it was possible because of the digital amp to have such a steep roll off. I would be nice if was a feature that could be enabled or disable, adding to the versatility of the sub. I guess I am going to set it to 60hz and use my BFD to even the transistion in the 50-60hz. I bought a sealed MBM and it has great punch in that 50-100hz region. The 600 is loud at those frequencies, but being ported and producing low frequncies at the same time did not produce the effect I was looking for.

I remember we had this discussion about the brick-wall about a year ago, and my recollection was that Axiom went from no brick-wall to brick-wall. Please check out this and this excellent write-ups by Alan Loft. The EP400/500/600 series all have brick-wall filters and he reports:

If a user wants to experiment and set the subwoofer's crossover at the same frequency as the receiver's crossover, better integration of the subwoofer may be achieved. Experiments at Axiom have shown that with the EP400/500/600 subs, it's advantageous to do so because of the brick-wall algorithms in the DSP circuits.

This is opposite of what Wid, Sirquack, and I recommended earlier in this thread.

I'm a little confused, I'm pretty sure Jakeman told me the reason my original 600 amp graphs looked the way they did is because of the brick wall filter inherent in the original DSP subs when they were released. My results in the new amp I received showed this filter was no longer in place. That was within the last 6 months.

Also, a few of us piloted a flash update using the computer interface, but this proved to not work in the field. New subs shipping from Axiom no longer incorporate the brick wall, as far as I understand with my conversations with Amie, and company.

Why do I get the feeling you are trying to reproduce that same bass hit you feel while at a bar.

Or that same punch he feels when hitting on someone at a bar.