MJK topic

Bob in St. Louis · « **on:** 31 Oct 2006, 05:40 pm »

Quote from: MJK on 31 Oct 2006, 05:15 pm

Martin

Are you "THE" Martin (MJK) that I've heard so much about?
Or am I confusing you with someone else?

Bob

MJK · « **Reply #1 on:** 31 Oct 2006, 06:08 pm »

I am Martin J King (MJK) who has too much time on his hands and an interest in speaker design (TL's, horns, and now OB's). I hate to think of myself as "THE" of anything, but ask my wife and kids and they will tell you I am "THE" household idiot. That about sums it up in my opinion, others might have different opinions both flattering and .......

Bob in St. Louis · « **Reply #2 on:** 31 Oct 2006, 06:24 pm »

Yup, your "The" Martin I thought you were. Glad to see you here sir, Welcome.

By the way, you can tell your wife that a great many people respect your opinions/facts/designs ect...

I didn't know you were into OB though. I have read peoples posts/threads about your TL's and horns, but no OB stuff mentioned.
I'll have to do some more digging.

Bob - "an OB newbee"

MJK · « **Reply #3 on:** 31 Oct 2006, 06:36 pm »

Quote

By the way, you can tell your wife that a great many people respect your opinions/facts/designs ect...

It won't help, she has known me for a long long long time. I have too many screw-ups to overcome to change her opinion.

If you look at my Project 7, you will see my almost 1 year old adventure into OB speakers.

Thanks for the welcome,

Martin

Bob in St. Louis · « **Reply #4 on:** 31 Oct 2006, 06:43 pm »

This one?
http://www.quarter-wave.com/Project07/Project07.html

I'm using these....
http://www.hawthorneaudio.com/drivers.htm

You'll also see pics here in the Gateway Audio Society thread.
http://www.audiocircle.com/index.php?topic=32494.50

(see my OB pics in signature also)

I'll be chipping away at your article today (hard to do at work, darn customers keep interupting)
It's over my head, but hey... A guys gotta start somewhere.

Bob

MJK · « **Reply #5 on:** 31 Oct 2006, 07:56 pm »

That would be the project.

It really sucks when work gets in the way of something really interesting.

Bob in St. Louis · « **Reply #6 on:** 31 Oct 2006, 08:21 pm »

I read the article Martin (no customers showed up for awhile

) very informative.
I think I may have learned something too!

What are the chances you've heard the Hawthorne SI?

I didn't mean to pounce on you as you walked in the door Martin.

Jeez, I could have at least let you come in, look around, get aquainted first.

Bob

MJK · « **Reply #7 on:** 31 Oct 2006, 08:42 pm »

Quote

What are the chances you've heard the Hawthorne SI?

Sorry, I have not heard the driver so I cannot really offer much of an opinion. What I like about my two way style of design is the low crossover point. I have a couple of other design options using one Alpha 15A (similar to SI woofer) paired with smaller Fostex full range drivers in a smaller baffle, but I still crossover at about 200 Hz. My goal was to keep the crossover point real low and out of the way.

Bob in St. Louis · « **Reply #8 on:** 31 Oct 2006, 09:19 pm »

Gotcha Martin.
Hawthorne has two 15" drivers designed to complement each other..The SI which is a coaxial, and the "Augie" that's the bass augmenter (I've only got the coaxial for now)
So you'd still have ultimate control over crossover points.
The imaging is amazing on the SI (coaxial).
I'm very pleased with the pair.

I look forward to reading more from you sir!

Bob

oldtimer · « **Reply #9 on:** 4 Nov 2006, 11:17 am »

Quote from: MJK on 31 Oct 2006, 08:42 pm

Quote
What are the chances you've heard the Hawthorne SI?

Sorry, I have not heard the driver so I cannot really offer much of an opinion. What I like about my two way style of design is the low crossover point. I have a couple of other design options using one Alpha 15A (similar to SI woofer) paired with smaller Fostex full range drivers in a smaller baffle, but I still crossover at about 200 Hz. My goal was to keep the crossover point real low and out of the way.

Martin, I have been down your current track some 2 years ago. I found similar results from using a variety of drivers, 10's 12's and 15's, and sometimes a combination of them. Bass I found was never a problem, and I also found the effortless sound you are reporting. However, I found that having a single driver in the baffle lifted the speaker to a new higher level. All areas of the speaker were improved. But the speaker needed bass augmentation, and for the last 6 months I have been trialing several different designs, currently using stereo Vifa Push/Pull subs crossed over at 180hz. I have a big enough room to make it possible to move the componenets around to achieve the best results.
Have you trialed any single driver OB's with seperate bass augmentation? I find it is interesting to hear each ones journey with OB's. There seems to be lots of different ways to achieve great results.

Happy listening
Nigel

MJK · « **Reply #10 on:** 4 Nov 2006, 12:25 pm »

Hi Nigel,

Quote

Have you trialed any single driver OB's with seperate bass augmentation? I find it is interesting to hear each ones journey with OB's. There seems to be lots of different ways to achieve great results.

No, I have not tried splitting the bass drivers off into separate enclosures. I can see some advantage to doing this since it would cut down the size of my OB system, they dominate my somewhat smaller room. I'll have to consider that approach during my next construction project if I decide to put together another OB system.

Thanks for the feedback and suggestion.

Scott F. · « **Reply #11 on:** 4 Nov 2006, 01:54 pm »

Hey Bob,

Don't know if you want to play with them but I've got an old pair of Martins MLTL's that I built to break in my Lowther PM2As. You could pick up a pair of Fostex and stuff them in the enclosures, build the bsc circuit and see what the true single driver world is all about if you want to.

Hiya Martin

Welcome aboard! (and yes I'm still using SET's

)
Although recently, I did hook up a pair of 100 watt, tubed monos to some Lowhters. I've got to say I was pretty darned impressed. It didn't do all the cool stuff SETs do, but it darned sure was fun.

Bob in St. Louis · « **Reply #12 on:** 4 Nov 2006, 04:05 pm »

Scott thank you very much for the offer, that is REEEAAL tempting, however I've recently sold my soul,... I mean credit card.... to Mr. Hawthorne for a few pair of his fifteen inchers.
When / IF I get over the OB virus I have, I might just take you up on that offer if you still have the enclosures. (What do I tell the wife?

)
I've heard stories about your equipment, looking foreward to December at your house.

Bob

MJK · « **Reply #13 on:** 4 Nov 2006, 05:00 pm »

Scott,

Unless there is some way of adding length to the slot/port, the Fostex drivers are not going to work well in the design. I would recommend a Lowther PM6C as the low budget option, it will sound great.

Scott F. · « **Reply #14 on:** 4 Nov 2006, 05:20 pm »

Quote from: MJK on 4 Nov 2006, 05:00 pm

Scott,

Unless there is some way of adding length to the slot/port, the Fostex drivers are not going to work well in the design. I would recommend a Lowther PM6C as the low budget option, it will sound great.

Good point. If I remember how I built them, I think (?) I left the bottom as a removable panel. That way I can adjust the port length by cutting another board for the port. The PM6Cs would work great as well, that way one could experience all the Lowther 'magic'.

It's sorta funny, I recently wrote an article on a mega-buck pair of Lowther based quarter waves (the Teresonic Ingenium's). Though they do extend another half octave lower than your design, your MLTL was remarkably close to thier sound, and way cheaper.

Bob in St. Louis · « **Reply #15 on:** 4 Nov 2006, 05:52 pm »

After posting my responce to Scott, and logging off, I got to thinking about (feeling guilty at my wording) what I had said.

If I were Martin, I might be just a little offended that someone wouldn't want to play with my design for no cost/obligation.
No offence meant.
Just too many "financial irons in the fire" at this point to take on another project in this wonderful hobby that has consumed much more than I ever thought it would (but it's a good pain!!!)

Ok, conscience has been cleared. I feel better. Carry on gentlemen.

Bob

MJK · « **Reply #16 on:** 4 Nov 2006, 06:24 pm »

Bob,

I never even considered your comments as any slight or offense. There are so many speaker projects and drivers I would like to work on and only so many hours in the day and so much money in my wife's checking account. No appologies necessary.

Scott F. · « **Reply #17 on:** 4 Nov 2006, 06:28 pm »

No worries Bob, I didn't read anything into what you wrote at all other than you've got your plate full right now. Trust me, I know what thats all about. I'm up to my ears in 'stuff' to do myself getting ready for the Christmas bash.

Besides, the MLTL's don't have any drivers in them. Whomever decides to play with them are going to have to spend a few bucks to get some drivers.

bpape · « **Reply #18 on:** 4 Nov 2006, 07:27 pm »

Out of curiosity, do you think the Hemp 6.5's would work in that box Scott?

Bryan

Brad · « **Reply #19 on:** 4 Nov 2006, 11:43 pm »

Quote from: MJK on 4 Nov 2006, 06:24 pm

Bob,

I never even considered your comments as any slight or offense. There are so many speaker projects and drivers I would like to work on and only so many hours in the day and so much money in my wife's checking account. No appologies necessary.

Martin:

What the heck did you do to get access to your wife's checking account?

That's pretty impressive.....