Axiom Home Page Forums General Discussion Technical Questions Crossover slope EP600

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.