or Connect
AVS › AVS Forum › Audio › DIY Speakers and Subs › Hey guys...we need a little rallying here...
New Posts  All Forums:Forum Nav:

Hey guys...we need a little rallying here... - Page 119

post #3541 of 9844
Quote:
Originally Posted by rajacat View Post

Erich,

I might be interested in those 16 ohm JBLs. My current speakers are running 16 ohms with a pair of modded Heathkit W5M's with no strain at all. The trannys have 4-8 & 16 ohm taps. They output 25 strong tube watts. I rarely reach 12 o'clock on my AVA T7 pre.

-Roy

What would I gain other than higher efficiency by running the JBL in series? Space, cabinet size, isn't a limiting factor for me but I don't regularly play at high volumes. As they say, there's no substitute for displacement. Would I get lower distortion, a greater sense of musical texture or what?
90% 2 channel music, 10% home theater.

Tube watts - aaargh! A watt is a watt.

You'd be running a pair of 16R in parallel to get 8R, not series. I don't see you'd gain anything by using a pair from your description and you'd need to roll off the lower unit, assuming a WWT vertical arrangement to ensure the C-C distance from the lower to the horn isn't too great and cause combing. Probably around 200Hz or so.
post #3542 of 9844
Yes, I don't need the extra displacement. A single 16 ohm woofer would be cheaper, more compact, less complex and perhaps a more optimum arrangement since my amp is designed for 16 ohm load. Like you say, the center to center distance to the outer woofer wouldn't have to be taken into account with just one woofer.
post #3543 of 9844
Thread Starter 
rajacat, if you want to match some old school drivers to your old school amps, take a look at the altec reproductions by great plains audio, particularly the 416-8c driver. it employs a lightweight moving mass, with a fairly powered motor, and then a very compliant suspension. if you have the room for a large ported cabinet and don't need ultimate power handling or excursion, it may be worthing taking a look. it is also available in 16ohms if you need that.
http://www.greatplainsaudio.com/downloads/416_8C.pdf
http://www.lansingheritage.org/html/...nts/416-8c.htm
post #3544 of 9844
LIDO 2,
Thanks for the links. The Lansing Heritage site was interesting, definitely retro with the black and white photos.

I like the concept of the lightweight, supple cone and surround materials. It stands to reason unless you need or want to blast away at high SPL, you don't need a stiff non-compliant suspension. If fact the more supple the suspension, given its under control, the more accurately it will be able to reproduce the nuances of music. I'm strictly after sound quality not the ability to play at very high SPL although I'm not sure they're mutually exclusive. If I want to use these speakers for an occasional movie, I have multiple subs to handle the explosions, etc. and the compression drivers will take care of the highs.
post #3545 of 9844
Thread Starter 
no problem. i agree with you that there is something about very compliant suspensions that allows them to be more revealing/more natural or whatever you want to call it when combined with a strong motor. the reason we don't see more is because they are much easier to destroy and the complaints and warranty repairs are more related to destruction than subjective lack of detail...

the drives aren't cheap, but blow the extra couple hundred bucks and forget about it. be happy and enjoy your rig.

edit: john j.'s td15m kind of met this and had more going for it, but as much as it hurts, if they are not available, they can't be recommended.
post #3546 of 9844
Quote:
Originally Posted by rajacat View Post

I like the concept of the lightweight, supple cone and surround materials. It stands to reason unless you need or want to blast away at high SPL, you don't need a stiff non-compliant suspension. If fact the more supple the suspension, given its under control, the more accurately it will be able to reproduce the nuances of music. I'm strictly after sound quality not the ability to play at very high SPL although I'm not sure they're mutually exclusive. If I want to use these speakers for an occasional movie, I have multiple subs to handle the explosions, etc. and the compression drivers will take care of the highs.

There is always the option of finding quality frames and having custom recones installed. Here's an example of rebuilding a JBL 2226 and to have better LF extension more like the 2235.

http://www.audiokarma.org/forums/sho...highlight=2236

Of course this works best when you start with blown speakers.
post #3547 of 9844
^^ Or leave off the mass ring and make 2234. Or use a different cone and make a 2220. Or a 2225.

Factory kits are expensive and aftermarket variable, so a working VGC second hand is usually the cheapest.
post #3548 of 9844
Quote:
Originally Posted by mobeer4don View Post

There is always the option of finding quality frames and having custom recones installed. Here's an example of rebuilding a JBL 2226 and to have better LF extension more like the 2235.

http://www.audiokarma.org/forums/sho...highlight=2236

Of course this works best when you start with blown speakers.

Gordon Waters does lots of interesting stuff. But that's pretty cool even by his standards.
post #3549 of 9844
I have a custom 2206 that Gordon rebuilt for me a few months ago that naturally rolls off a just a little too fast for the standard ewave XO. I'm waiting for the SEOS 12 to see what I can do with it. Actually I should have someone that knows what they are doing mess with it . The project below was abandoned once I discovered how close the budget SEOS stuff was to completion. The ewave stuff will end up paired with something else...

http://www.audiokarma.org/forums/sho...highlight=2206
post #3550 of 9844
Quote:
Originally Posted by bwaslo View Post

Here's the schematic for the box shown a little earlier, and for which the distortion plots were done. It seems to work (at least in PCD) for either the Eminence DeltaLite 2512 or the Eminence Delta 12A. Measurements here are with the 2512, at about a meter, indoors, on the tweeter axis, 1/6th octave smoothed. Woofer and waveguide are on the same mounting plane, so if you inset one very much, inset the other by about the same amount (or you can vary the insets to direct the vertical lobe a little). BTW, on these designs I'd recommend getting the tweeters up away from furniture height for use, to minimize near reflections off of it all -- sounds better, I use ear level.

A relatively simple crossover (though it has my finicky tweaks on the waveguide). Parts Express part numbers are shown on the schematic as well.

For the 33uF capacitor, an inexpensive NP electrolytic will work fine, but if you plan to have the speaker passed down through generations of your descendents, you can use the $13 film cap instead.

Horizontal Curves, 0 to 90 degrees in 7.5 degree steps:

The dark blue trace (the 7th trace) is 45 degrees.

Horizontal Polar Map:


As Erich mentioned, the woofer hole was cut too low, so CTC is about an inch and half further than it has to be. Anyway, here are Vertical (Up) curves to 30degrees. Flat response is a bit narrow in the vertical, but that should be better when the drivers are moved closer together.

Hey Bwaslo. Nice job with measurements.

But i can not see the xover pic so i would be grateful if you would upload it again.

Once again, great work

PS I posted on DIYsoundgroup before i read that you've asked us not to. Sorry.
post #3551 of 9844
Quote:
Originally Posted by toshiwakano View Post

But i can not see the xover pic so i would be grateful if you would upload it again.

Ok, it should be there now. Got deleted somehow.
http://diysoundgroup.com/forum/index...opic=9.new#new

Quote:
Originally Posted by toshiwakano View Post

PS I posted on DIYsoundgroup before i read that you've asked us not to. Sorry.

No biggie. I've kind of given up on asking Erich when he is going to finally declare the forum open. He's too busy this time of year I guess. Ah, the joys of self-employment, all customers become your boss...
post #3552 of 9844
Quote:
Originally Posted by bwaslo View Post


No biggie. I've kind of given up on asking Erich when he is going to finally declare the forum open. He's too busy this time of year I guess. Ah, the joys of self-employment, all customers become your boss...

Never give up Mr. Waslo! I had someone I met on the interwebz help me make some changes to the site's template. Little things that most people wouldn't notice but really bothered me. The search feature is now working, the "product" pictures are bigger. It doesn't give an error when there's too many items showing on one page. The "favicon" should now be a blue speaker......but I think that takes a little time to finally show up, or you have to clear the cache? Not sure. It showed up on my girlfriends computer, but not mine yet.

The subcategories appear a little farther over so they don't cover up half the main categories. Oh, and the thing that was really bothering me was the "bread crumb" navigation that wasn't working. So if someone linked a flat pack, you wouldn't even know what category it was in without that navigation bar up top. It's there now so you know what category the stuff is in.


AND, up at the top there was a link for "New Products" that came with the template, but it never did anything (or I couldn't figure it out). So I had the programmer change it to "Forum". They charged $30 per hour, but I didn't know how long it would all take. He said it took 10 hours to complete all of that. Not sure if that's good or bad, but at least it's done and I feel better about it.



Long story short Mr. Waslo: your forum is up and running, but I still need to go through and delete any test posts or things like that. No doubt there will be some tweaking needed. I also want to double check forum software to see what else is out there just in case. Not sure I remember my login info!
post #3553 of 9844
Thread Starter 
looking good.

one suggestion:

DIY Sound Group >> Forums >> Topics...

where the DIY Sound Group links to the homepage.
the Forums links to the homepage for the forums.

as it stands, there is nothing to click on that you to the DIY Sound Group homepage.

nice work. the site is really coming together.
post #3554 of 9844
Under "Support" section see: "DIY Sound Group home page". That's a redirect to the main non-forum page.
post #3555 of 9844
Thread Starter 
i stand corrected. i should have been more precise, "on my 1280x800 screen, there is no link to the diysoundgroup.com site that is above the fold". ;-) small potatoes.
post #3556 of 9844
None of us really do php programming, so we're limited to what options the forum software gives us in its menus and admin settings. We could probably go in and find where to edit it to make it happen, but I'd probably crash the whole operation and then it would be all night to figure out how to get it back.
post #3557 of 9844
whoa, I never even noticed there was a passive deltalite XO out.

**** just hit the fan
post #3558 of 9844
Quote:
Originally Posted by bwaslo View Post

Ok, it should be there now. Got deleted somehow.
http://diysoundgroup.com/forum/index...opic=9.new#new

Thanks BWaslo.

Where is xover point in this design ?

Polar is great
post #3559 of 9844
Just wanted to let everyone know that I picked up the pallet of waveguides and horns from Poland yesterday from the shipper. I'll start boxing things up this weekend. There's going to be a lot to box up because Easter on Sunday kept me busy and we went out on Monday for my Dad's birthday.

I have a 15.5 year old shepherd mix that seemed to take a turn for the worse on Tuesday. No doubt the best dog I've ever had. An old girlfriend and I got him from the pound as a just weened puppy. And even though we no longer date, I still go over to see him every day along with our other dog. His back legs and hips are pretty much done.

He seemed a lot better yesterday morning when I stopped by. But she called me last night around 6:00 asking me to come over. He couldn't get up off the floor so I ended up sleeping next to him all night last night. What was rough was seeing him reach out his front paws out and pull himself closer to me and put his head on my arm, he always used to do that. You could just see the look on his face that he knows it's time. Luckily he doesn't appear to be in any type of pain.

After almost 16 years, we just can't expect him to go much longer. He's given us a lot of good times. I've never had to do it, and I know it's going to be horribly difficult, but we decided last night that we should put him down. She took off work today. This morning he looked a little better, so she thinks she'd rather spend an extra day or so with him. We'll probably make the appointment for Saturday. It's going to be very tough.

One thing about Bailey that everyone used to like was that he really did smile a lot. This photo is a little distorted making his snout look bigger than normal, but it did catch his smile.

post #3560 of 9844
Sorry to hear about your pup!

Good new about the horns from Poland.
post #3561 of 9844
Beautiful dog...remember the smiles
post #3562 of 9844
Sorry to hear that Erich. I understand the bond you two have. My boxer just turned 8. It seems like it was just yesterday she was waking me up at 5am to play. I wish I had some words to make you feel better.
post #3563 of 9844
I'm sorry to hear that Erich. That's a very nice looking dog. I have always loved Shepards. My collie-shepard mutt is actually somewhat similar looking but with more of collie face. At least he had a long happy life!
post #3564 of 9844
Erich,
Those pooches have a way of nuzzling right to our hearts. Remember all the joy he brought to you and others. He'll let you know it is okay to let go.
post #3565 of 9844
Sorry to hear the bad news about the pooch.
post #3566 of 9844
Erich, wow that was a very touching and emotional post. Brought tears to my eyes. I am very sorry for the sad news, but it sounded like the two of you had a great journey together. Good luck bud.
post #3567 of 9844
Erich,

Very sorry to hear about your friend, it just plain sucks.

We had to let my friend Exo (beautiful Dobermann) go last August 1st. The doctor was great and I got to say goodbye to him while he was home. He was just two weeks shy of his 12th birthday.

Then two months after that we had to let go of another friend of ours, Jazz our 18 year Manx cat.

Time still has not helped me as of yet but hopefully will later on.

Keep your head up and remember the great times.

James
post #3568 of 9844
I had a scare back in November where my 11 year old airedale all of the sudden lost complete control of her hind quarters. she wouldnt even lift her head off the floor either, she was pretty much completely down and out. Still to this day is unexplained but after 24 hours of antibiotics, she was up and going! It has made her weak in the rear, but she seems like things are just fine otherwise!! I truly was worried for a few days until I saw her up and moving again. Just something about how dogs get into your heart so easily, im truly sorry for what you are going through.
post #3569 of 9844
Sorry to hear about your dog. It is hard to watch anybody that you care about decline in health. Thoughts and prayers are with you and it is good that you had that many years with a good dog, they usually don't make it that long.
post #3570 of 9844
Sorry Erich. Keep your head up, guy.

-Nate
New Posts  All Forums:Forum Nav:
  Return Home
  Back to Forum: DIY Speakers and Subs
AVS › AVS Forum › Audio › DIY Speakers and Subs › Hey guys...we need a little rallying here...