New build for shop system

[laatsch55]

Computer based signal generator?

 

[AngrySailor]

No, I had borrowed an OLD ass hand held sine wave generator. Super basic, dial with RCA outs. I have an app on my phone but I don’t really think it’s signal quality is too hot.

One cabinet mocked up for the most part. Just sorting out details and then going to make a cutting list for the other three. That’s ay each cabinet will end up with the exact same internal bracing/volume reduction.

These bastards are HUGE...

 

[AngrySailor]

Weak pile of bracing... I think there’s gonna be 10lbs of screws in these when I’m done...

I’ve got a list going of parts, we’re going to make sure this one goes together good then cut and number everything as many parts are only different by 3/4”... it’s possible a
Couple got messed up... possible...

 

[AngrySailor]

This one is ready for sine wave testing. Tomorrow I’ll bring one of my commercial amps and the second speaker over. Just one speaker sitting in the hole with a board over the other she has a deep tone with a gentle tap on the speaker... sounding promising.

 

[laatsch55]

Thatd coolness...

 

[AngrySailor]

Just ran a frequency sweep on the first cabinet. It’s really hard to tell visually, I almost think my extra port length has me tuned lower than the 20hz my phone app signal generator can go. I really need a series resistor and read the resonance with my multimeter. Now where the heck can I find a 5-10ohm 10w resistor in bumble-eff nowhere, on a Sunday?

Going to carry on cutting the bracing for the rest of the cabinets today and fine tune after.

 

[J!m]

Might be cool to have the ports come up and out the top five feet or so. Pipe organ style...

 

[orange]

Just ran a frequency sweep on the first cabinet. It’s really hard to tell visually, I almost think my extra port length has me tuned lower than the 20hz my phone app signal generator can go. I really need a series resistor and read the resonance with my multimeter. Now where the heck can I find a 5-10ohm 10w resistor in bumble-eff nowhere, on a Sunday?

Going to carry on cutting the bracing for the rest of the cabinets today and fine tune after.

You Tube has a video test for that, I don't have the link right now but it goes from 0 Hz and can do some possible damage if you don't pay attention to volume.

 

[AngrySailor]

There’s Trever cutting the last piece. Other than a little trimming that’s all the wood done. Ended up using 10 sheets almost exactly. Have half a sheet left but used a couple quarter sheets from the lo-max build. Not bad waste wise either. Not really enough for a little camp fire!

Speaker lubricant break now.

 

[orange]

You Tube has a video test for that, I don't have the link right now but it goes from 0 Hz and can do some possible damage if you don't pay attention to volume.

Here, take your pick https://www.youtube.com/results?search_query=frequency+sweep+generator

 

[laatsch55]

Good planning...

 

[AngrySailor]

Good planning...

Luck, we were pretty drunk..

 

[laatsch55]

Being drunk doesn't necessarily preclude bad planning...

 

[grapplesaw]

Luck, we were pretty drunk..

The only time to use power tools

 

[AngrySailor]

Ran some numbers and the 11” port comes in at 21hz which is probably why I couldn’t get to resonance. I left these two ports long so I could sneak up on the theoretical 9” for 26-28hz. Tonight I’ll cut them down and keep testing. Also going to try to find a suitable resistor rather than test visually, it’s hard to tell with larger speakers/cabinets and at the level you need to input to see the cone move, I think trevers shop might fall down...

 

[laatsch55]

You can back out sheet rock screws..believe me..

 

[AngrySailor]

Picked up two 10 ohm 5w wire wound resistors. They should work fine in parallel for this testing.

 

[J!m]

Until they melt, anyway.

Where's the smoke?

 

[AngrySailor]

Got recruited to help fix buddy’s vintage sled. Old arty cat JAG 300. Broke a piston skirt by the looks of things. Not even sure my sunnen home will go small enough... I’ve seen chainsaws with bigger pistons!

 

[J!m]

Sounds like a good time to put those big chainsaw pistons in!