GM's MLTL with 416-8B

**westend9** · April 11th, 2011, 03:32 PM

Originally Posted by GM

It's not the veneer to worry about, but water blistering any exposed MDF, though if there's a leaky joint it might seal it up. Hmm, a new way to seal MDF cabs by spraying/'floating' a little water along all inside seams, he asks half seriously.

Really? I admit I haven't used genuine Windex since the store brands became available decades ago, but these bubble up good enough for me, though I guess the best would be the kid's bubble blowing solution if it's not been banned by the govt.. Google returned a DIY solution when searching for it though: http://www.zurqui.com/crinfocus/bubble/form.html

Got to try this on a so far bubble free, yet slow leaking, tire that even the local car repair/tire emporium has repeatedly failed to find, but refuse to replace as defective. Guess who won't get any more of my vehicle related sales...............

GM

I don't know, the Windex I use doesn't seem to make a lot of bubbles but I've never used it to do that. For pipe inspection, I mix a couple of teaspoons of dish soap and a pint of water in a spray bottle.
Next time you spray the tire for inspection, GM, give the inside of the rim a thorough coating, too. I've had leaks through the welds in the center of a rim a couple of times.

**Vint_age** · April 11th, 2011, 08:46 PM

Just put one of these in the box and seal the port.

http://www.harbormodels.com/site08/m...ges/smoker.htm

And if you are really adventurous, pull the woofer and seal the hole with a plywood disk, put a tire valve on the plate you seal the port with and add compressed air to speed things up.

**westend9** · April 13th, 2011, 06:21 PM

Well, stayed up late last night and put the last coat of finish on the cabinets, I was impatient to hear the setup.

I am triamping the system with a Pass F5 on the 802g/811, JBL/UREI 6290 (a beast) on either the Heils or the 416's, and a Kenwood KA-8150 switching with the JBL. I am crossing through a Behringer CX3400 at 1100 hz to the horn and at 9300hz. to the Heil. Preamp is a Yamaha C2a and source is a Yamaha DVD player. Quite a combination of gear and level matching is tricky. The garage venue is pitiful for sound stage and all else but, man, what a sound.
The presentation of the low end in the MLTL is nicely balanced and there seems to be no bottom. It is very smooth but can pound your chest, too. It is heads above the stock Model 19 box. I'm throwing a lot of different material at it and everything is good. It is like moving from the back of the crowd at a concert to being right up front. GM, you are a genius. Thanks so much, this is a total success.

**westend9** · April 17th, 2011, 04:59 PM

I've kind of settled into a good listening schedule with the new boxes and have fiddled around with level matching and such. Also had a few visitors that confirmed we're on a good track with these. I even had my old buddy, Harry, in the room for a while. This is a cat that is over 90 and still recalls a lot of his speaker building days. To him, Sinatra was an upstart, funny stuff.

The woofers have seemed to break back in and other listeners have confirmed this. This is no surprise as I had them in storage for a couple of years. I think I can get the lower end a little "livlier" by removing some of the stuffing. I think it is a little too much for the application. I plan to remove about half the thickness and see if there is any change. I hope to get a little more reinforcement of the really low stuff by doing so. More of what's already present, I guess. Any suggestions appreciated on the stuffing.

Overall, the enclosures are very good, lower notes are reproduced substantially and the venerable 416b is allowed to shine. A board member suggested to get some measurement gear and that is on the schedule. I am weighing options on that.

**AltecLansingFan** · April 19th, 2011, 11:32 AM

Originally Posted by westend9

............. A board member suggested to get some measurement gear and that is on the schedule. I am weighing options on that.

You also can test the enclosures with your ears, with this CD http://amzn.to/ebCGnn
And of course, and that's very important; only testing in your listening room!!!

**westend9** · April 20th, 2011, 12:00 PM

Originally Posted by AltecLansingFan

You also can test the enclosures with your ears, with this CD http://amzn.to/ebCGnn
And of course, and that's very important; only testing in your listening room!!!

Thanks, I'll get it coming my way.

**AltecLansingFan** · April 21st, 2011, 10:18 AM

Originally Posted by westend9

Thanks, I'll get it coming my way.

I think it's track 18, 19 and 20 (I'm not really sure) There you can hear all Hz from 10Hz and up. The best is that you can hear almost NO or less volume peaks in the frequency's.

I'm not an expert, but when I look to the enclosure, the briefcase vent looks not too big.
So I think when you have some problems with the LF, you can tune the vent, to make the vent deeper. I would start with a vent from around 6 cm deep (make a 4 cm. deep wood frame from plywood, and put that wood frame on the inside around the vent. In the test phase you can clamp it temporary with a clamp. (during the tests you can adjust the frame by cutting it smaller and find out what works best in your situation) Succes!