Originally Posted by DavidK442
Did you ever do the max output distortion sweeps?
Sorry for the delayed answer. No I did not.
A raised credit limit and Christmas sale prices caused my upgrade plans to advance sooner than I expected. I picked up 2 Inuke 3000dsp's and a Ultimax Um18-22 driver at ridiculously low price. Since then I have been very busy building a set of slot ported MBM's to hold the 2 pa460's and I ended up putting the Ultimax in the Full Marty. The pa460 was decent in the Marty but I was having to use a progressive boost low shelf starting with about 3db at 80hz and as much as 18db around 20hz just to get a flat response. This led to a strained sound at high output levels. It sounded powerful but had a sort of muddy/boosted tone. The Pa460 sound so clean and punchy in the MBM cabs. I just finished the 2nd one yesterday and with both behind my couch I finally have strong punch in my room. Music now sounds concert like and kick drums hit you right in the chest and back. Movies got a very obvious boost in mid bass power and dynamics. Gun shots and expolsions are completely different with the MBM's. I should have built these years ago and recommend some Pa460 MBM's to anyone who can fit them in their room. Here is a link to the cab design I used for mine.
Its a project
posted and he had help from
on the design. I did change the tune a little from 40hz to 35hz by adding 8" to the port length. I also have the option to plug one side of the port for a 24hz tune.
for posting this project, and a special thank you to
for all they do on these forums. I'm now using 3 sub designs they were involved in or designed and I couldn't be happier or more blown away by their performance.
On another note I feel I need to say something about the Dayton Ultimax um18-22. I have owned an Si Ht18d2 for a couple years now and it is an amazing driver, especially for the price. The Um18-22 is a different BEAST all together.
I had read a lot of good things but feel none of it prepared me for what the Ultimax can do. I was planning to buy another Si Ht18 when they a re released in 2017 but decided to try the Ultimax after seeing 2 different Seaton sound designs that use UM drivers. No wonder mister Mark Seaton uses this(or a version of this ) driver. (see Seaton Terraform/F18) Anyway I'm so glad I did and now I'm considering selling my Si Ht18 for another Ultimax. Now I know there are much better more expensive drivers out there but the Ultimax is a serious piece of kit for sure. I'm by no means an expert but (not considering distortion) for about a grand I bet 3 Um18-22's would stomp most $1000 drivers. All I know for sure is there will soon be more Um18-22 Ultimax drivers in my system!! If anyone is on the fence or wondering what driver to buy, I can't scream Dayton ULTIMAX loud enough!!!!!!