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Re: What's to chat about?
Posted: Sun May 03, 2020 5:59 pm
by Grant Bunter
Grey Owl wrote: ↑Sun May 03, 2020 5:39 pm
These comments sound like a great start to a physics lesson.
Watching with interest.
Cheers
Haha yes!
Physics in sound is unavoidable.
It's just that a lot of people don't know it, so myth becomes black and white, which becomes reality, which..
An example is why a bass player shouldn't use a single (or double) 15, under their 2 x 12 (or 4 x 10), which is what a lot of bass players may do...
Re: What's to chat about?
Posted: Sun May 03, 2020 9:27 pm
by Grey Owl
Hiya Grant,
FB has a very wide cast and last week, the logarithmic Gods sent me a link to your FB page which then popped up on my screen.
You've constructed some great looking units shown on your photo pages; impressive work.
Cheers
Grey Owl in Auckland
Re: What's to chat about?
Posted: Sun May 03, 2020 9:33 pm
by Grant Bunter
Grey Owl wrote: ↑Sun May 03, 2020 9:27 pm
Hiya Grant,
FB has a very wide cast and last week, the logarithmic Gods sent me a link to your FB page which then popped up on my screen.
You've constructed some great looking units shown on your photo pages; impressive work.
Cheers
Grey Owl in Auckland
HaHa!
Thank you...
Re: What's to chat about?
Posted: Thu May 07, 2020 4:56 am
by jemo1234567890
SethRocksYou wrote: ↑Fri May 01, 2020 7:43 pm
... and the Lab 12 is also 450watts (50 v, but 6 ohms), yet achieves 13mm xmax /659cc Vd, vs. 450 watts getting 10mm/531cc Vd for the 18 Sound using Bill's estimated figures. So, it seems it would be the king of output potential and efficiency. maybe?
Dunno, just thinking out loud.
This questions I asked myself these days, too.
Which driver should I choose if I want the most Vd with the most efficiency and a manageable width.
Especially if weight (and money
) doesn't matter...
My equations say a double lab12 with 1318 ccm with 800 watts. So I would call it the Golf GTI 1,3
Re: What's to chat about?
Posted: Fri May 22, 2020 12:25 am
by Seth
So, I delivered the new T39/SLAP rehearsal system to my dad a couple weeks ago. We previously had him using 8" Fender Passport tops and an inexpensive 12" ported sub powered with a Behringer iNuke1000 DSP.
Here's what I noticed;
-By ear, a single 2x6 shorty SLA Pro (16ohms nominal) required at least 6dB
less input gain to have roughly the same output as the 8ohm Passport speaker.
-The highs in the SLA easily outperformed the Passports two 2"ish splayed cone tweeters. I quickly realized I'll need to deploy a de-esser or start pulling some highs out of the mic's now. Seth's sinister esses stick out sorely sassy sister!
-This system has more volume potential than my Dad is likely to ever use, even other than rehearsal situations, in intimate indoor gigs. A lot more. Thinking I could have easily covered his needs with the smaller amp (200wpc) and the Basslite S2012 driver instead of the 3012LF. Always an option if I need or want to swap them out for whatever reason.
Anyway, that's it for now. Thanks for the great design Bill.
Re: What's to chat about?
Posted: Fri May 22, 2020 2:31 am
by Grant Bunter
SethRocksYou wrote: ↑Fri May 22, 2020 12:25 am
So, I delivered the new T39/SLAP rehearsal system to my dad a couple weeks ago. We previously had him using 8" Fender Passport tops and an inexpensive 12" ported sub powered with a Behringer iNuke1000 DSP.
Here's what I noticed;
-By ear, a single 2x6 shorty SLA Pro (16ohms nominal) required at least 6dB
less input gain to have roughly the same output as the 8ohm Passport speaker.
-The highs in the SLA easily outperformed the Passports two 2"ish splayed cone tweeters. I quickly realized I'll need to deploy a de-esser or start pulling some highs out of the mic's now. Seth's sinister esses stick out sorely sassy sister!
-This system has more volume potential than my Dad is likely to ever use, even other than rehearsal situations, in intimate indoor gigs. A lot more. Thinking I could have easily covered his needs with the smaller amp (200wpc) and the Basslite S2012 driver instead of the 3012LF. Always an option if I need or want to swap them out for whatever reason.
Anyway, that's it for now. Thanks for the great design Bill.
Good one Seth
Only 6dB less?
I'd have thought that was a bit conservative having messed with a few Passport systems myself.
Kudos to you for doing what you've done, S'sss and all
Re: What's to chat about?
Posted: Fri May 22, 2020 3:29 am
by Seth
The SLA Pro's are waaay more sensitive than the Passports. Trying to A/B them to compare SQ and response (Dad's request, my indulgence) showcased the sensitivity difference immediately and very obviously, having to bring the Passports up considerably to meet the bass output. Switch back to the SLA Pro and now it's waaaay too hot... bring it back down.
I honestly expected it to be the other way around, if anything. So, I was pleasantly surprised.
Eighteen Sound - speaker manufacturing plant. What's to chat about?
Posted: Fri May 22, 2020 7:22 pm
by Grey Owl
Hiya
Found this link this morning. Found it interesting so include it here for your viewing.
Code: Select all
https://www.youtube.com/watch?v=-JTyFPM4MV8&t=188s
Cheers
Factory Tours
Posted: Fri May 22, 2020 9:25 pm
by Seth
Re: What's to chat about?
Posted: Fri Jun 05, 2020 7:51 am
by Bryan Cox
Totally switching gears here. But I just picked up a Dewalt right angle attachment. This is going to change my life when I build my next herd of cabs! I could see this being very helpful for attaching drivers in tight spaces.....
Re: What's to chat about?
Posted: Fri Jun 05, 2020 8:08 am
by Bruce Weldy
One of the reasons that I've gone to Lag bolts to secure speakers is that it's always easier to get a socket in a tight space. Even if you have to use a flexible extension or a knuckle joint extension. Doing that with a phillips head or square drive is tough.
Re: What's to chat about?
Posted: Fri Jun 05, 2020 12:59 pm
by Bryan Cox
Luckily I haven't built any cabinets that gave me an issue in this department. But that day may come. And lag bolts are a great idea as well.
Re: What's to chat about?
Posted: Fri Jun 05, 2020 4:50 pm
by Bruce Weldy
Bryan Cox wrote: ↑Fri Jun 05, 2020 12:59 pm
Luckily I haven't built any cabinets that gave me an issue in this department. But that day may come. And lag bolts are a great idea as well.
Also, less chance of them slipping off like a screwdriver and poking the cone.
Re: What's to chat about?
Posted: Fri Jun 05, 2020 8:01 pm
by himhimself
Also, less chance of them slipping off like a screwdriver and poking the cone.
That's always my fear! I used GRK cabinet screws. They have a fat washer head and torx T-15 drive that is nice and secure. But a socket could be even more sure. Next build...
Those right angle gadgets are really useful in tight spots, but also can be kinda wobbly to hang on to. I don't use mine very often but it sure comes in handy now and then. And was a lot cheaper than buying a dedicated right angle drill/driver.
Re: What's to chat about?
Posted: Sat Jun 06, 2020 3:40 am
by Bruce Weldy
himhimself wrote: ↑Fri Jun 05, 2020 8:01 pm
Also, less chance of them slipping off like a screwdriver and poking the cone.
That's always my fear!
That's why I always put the circle of ply from the baffle cutout on top of the driver while I'm installing it.
