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 91 
 on: Yesterday at 09:37:08 pm 
Started by Peter Kowalczyk - Last post by Luke Geis
Great JR..... Now in 1,000,000 years, flies will be 6' tall and run around with electric fly swatters whacking us as they do so laughing that they not only evolved to avoid swatters, but that they learned to use them.

 92 
 on: Yesterday at 09:33:29 pm 
Started by Scott Holtzman - Last post by Luke Geis
little did you know, they were likely placing bets on whether you would do it or not. Passed the test you could say!!! You know your the hired help when the client says " why didn't you take out the trash.....". I find it to be different when they ask if you can / will. That gives you an opportunity to say no.

 93 
 on: Yesterday at 09:17:30 pm 
Started by Dave Garoutte - Last post by Jason Glass


It's mostly to make it easy to align them.
Actually, the smooth arc is much more finicky as to the mating fit.
Any variance will show up as wiggle.
The 'splines' on mine have a short straight section at the engagement interface which allows for some give in the profile.
The actual machining time would be very similar for an arc and the splines; only a few seconds difference.

I've done a fair amount of astronomy stuff.  Google 'Monolith portable pier'.  That's 100% my design and manufacture.

Holy crap! I KNEW that I recognized your name.  Cloudy Nights forums, right?  I have lusted after that pier for quite some time! My current portable pier is an ATS.  It's super rigid and damps uber quick, but damn, it's heavy to transport.  Ask me sometime about my Sorbothane Losmandy damping feet mods. My rig oscillates 1/2 wave, at most, with a hard slap to the aperture edge of the OTA, resting on stable ground.

Sorry to veer off-topic, guys. But Dave is a badass from another universe!

Sent from my Nexus 5 using Tapatalk


 94 
 on: Yesterday at 09:03:38 pm 
Started by Dave Garoutte - Last post by Dave Garoutte
It's mostly to make it easy to align them.
Actually, the smooth arc is much more finicky as to the mating fit.
Any variance will show up as wiggle.
The 'splines' on mine have a short straight section at the engagement interface which allows for some give in the profile.
The actual machining time would be very similar for an arc and the splines; only a few seconds difference.

I've done a fair amount of astronomy stuff.  Google 'Monolith portable pier'.  That's 100% my design and manufacture.

 95 
 on: Yesterday at 08:58:19 pm 
Started by jesseweiss - Last post by Bob Leonard
My opinion is $1000 sub is entry level pro gear.  Below that you just cant build a quality sub.

The next step up is a big one though.  There is very little difference in the $1200-1500 space.  To get a more capable sub you have to double that.
Sent from my VS996 using Tapatalk



The above statement tells it all. Minimum will be SRX.

 96 
 on: Yesterday at 08:54:12 pm 
Started by Hayden J. Nebus - Last post by Hayden J. Nebus
Solder joint reliability withstanding strain or vibration is all about grain size.  Eutectic solder gives a smaller and more uniform grain during solidification.  There are always other things in the solder, even when not deliberately adding silver.  So the intermediate plastic phase allows for grains of other alloys to grow.  Where with eutectic they tend to be frozen in place.

Lead free doesn't really have any true eutectic alloys so it's always a compromise.

The fatigue failure is a bit different between leaded and lead free solder.  Lead based solder creeps.  Grains enlarge, micro fractures develop at the boundaries and get larger as the grain size grows.  Eventually a fracture will propagate across the micro fractures and you have a failure.  Lead free solder is stronger initially and doesn't creep.  Which means that grain growth comes from stress and fractures develop more quickly when they happen.  You can look at a leaded joint and see a rough almost blistered appearance.  It's starting to develop fractures and will go soon.  With lead free it's hard to tell from the outside until a fracture appears, in which case it's often too late.

Disclaimer, back in the '80s I did a bunch of reliability testing on the then new SMT technology at a defense contractor I worked for.  I was part of writing the book on how to make this work.  I was the first to present to the DoD a successful run of 1000 cycles of thermal cycling from -54 to 125C on an LCC44, which was kind of a benchmark at the time.  The pictures of LCC joints in Mil-Std-2000 and the copies in the current commercial industry standard IPC610 came from me and that research.

Thanks Stephen! Fascinating that the toxic stuff does in fact always work better!

One of the ancient Chinese secrets I picked up from the   Non-chlorinated brakleen will do a hell of a job cleaning not just car parts,  but tape heads too, and if used sparingly even resurfacing rubber rollers. It also contains substances known to the state of California to cause cancer and birth defects. Good thing I don't live in California!

 97 
 on: Yesterday at 08:50:46 pm 
Started by Scott Holtzman - Last post by Erik Jerde
There is nothing that is below me.  I have to clean the grease traps at the church and I am humbled to be of service.

Just to be clear.  The treats and gratuities were given long before this request, the genuinely treat us and all the folks that work for them well.  I view long terms relationships as partnerships.  My emotional reaction (and why I discarded it) is we are clearly the paid help. 

I was in the IT business in Cleveland for 20 years.  I run into clients at shows that we are working and it is an interesting reaction.  They don't recognize me, some that do will avert their gaze.  Others will ask me what in the world am I doing and when I explain look at me like I am crazy.

The production arts are very misunderstood.

On the flip side I used to do primarily wedding gigs with a cover band.  It was a crap job for meh money which is part of why I no longer do it.  I did have one gig where one of the guests complemented me on my mix and then bought (and brought) me a nice dram of scotch.  Legit single malt, neat.  So while most of the punters don't get it there's some that do and when they show up it certainly can plus a gig.

 98 
 on: Yesterday at 08:37:15 pm 
Started by Scott Holtzman - Last post by Debbie Dunkley
The DSR112 does NOT have the lower extension of the DXR15 or the DSR115.
It is meant to use with a sub.
That's probably why the are so awesome; they don't try to do it all.

Yep.... I used to own a pair of DXR15's and was able to compare them to my DSR112's. Without subs the DXR's are fantastic and have MUCH more low end than the DSR112's. I realize that this seems unfair comparing a 12"to a 15" but even my DXR10's probably have more low end than my DSR112's......HOWEVER neither the DXR10 nor the DXR15 has the clarity and mid punch of the DSR112 - and used with subs neither sound as good. ... still great speakers though.

I can't imagine how the new DZR's can have more clarity than the DSR's - I think that would be hard to do BUT I am intrigued and would love to hear them.

 99 
 on: Yesterday at 08:30:31 pm 
Started by Dave Garoutte - Last post by Jason Glass
Here's the next installment; the bottom saddle plate.

I may take a video of the machining and yootoob it.

Hi Dave,

Gorgeous machine work! I love the smell of aluminum chips in the morning.

Why are the stepped cogs necessary? These parts are practicaly identical (minus cogs), in practical function, to the polar alignment altitude angle segment plates on a Mountain Instruments MI-250 equatorial telescope mount, which is conservatively rated for a 150 lb. dynamic load.  Believe me, I loaded mine up on several occasions and the thing was wonderfully rigid. You might be able to shave off a lot of machining time and cost with smooth mating surfaces while allowing for infinitely fine angle adjustment and still have rock-solid engagement for the semi-static load of a speaker. I'd love to know your thoughts on this and if you've experienced a firsthand necessity for such deeply engaged parts.

http://www.mi250.com/images/rocker.jpg

Sent from my Nexus 5 using Tapatalk

 100 
 on: Yesterday at 08:26:06 pm 
Started by Tom Harrison - Last post by Tom Harrison
Hi everybody
I'm a newly registered member but have been following the forum for a while. I need a pair of speakers and a pair of subs for small live and corporate event. Mainly for music playback and vocal with acoustics or soundtrack. Will be playing around 100dB or less so overall SPL doesn't matter. Weight and costs are also not a factor as we're not going to expand this system. The main criteria is sound quality and nothing else, must have liquid smooth and warm midrange for vocal and smooth high end. I'd like to hear your experience/opinion before I attempt to demo these. A lot of local distributors don't carry both brands. So here it is:

Nexo PS10R2 + LS600 + the brand new/refreshed amp NXAMP4X2MK2 (now 1200 watts 8 ohms instead of 1000 in the older model)
Vs
L'Acoustics X12 + SB18 + LA-4X amp

They're different sizes and it's not going to be a fair fight but I'm looking for that haunting realism, open, and smooth sound. Can Nexo come close to the coherent coaxial design? I can get either systems for about the same price zone so sound quality is the only thing being considered here.  Thanks!

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