TH-18 Flat to 35hz! (Xoc1's design) - Page 126 - diyAudio
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Old 14th March 2013, 01:51 PM   #1251
tb46 is offline tb46  United States
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Hi NEO Dan,

Post #1248: "...looks like a stopper for those of us in the US, the AC requirements, single phase 230v 63A..."

I think that should be possible with general utility power in home installations. The US home 2-Phase power is really just a 230(240)VAC/60Hz single phase; center-tapped that gives you two 115(120)VAC phases.

Regards,
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Old 14th March 2013, 04:36 PM   #1252
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Quote:
Originally Posted by tb46 View Post
Hi NEO Dan,

Post #1248: "...looks like a stopper for those of us in the US, the AC requirements, single phase 230v 63A..."

I think that should be possible with general utility power in home installations. The US home 2-Phase power is really just a 230(240)VAC/60Hz single phase; center-tapped that gives you two 115(120)VAC phases.

Regards,
You are correct. I live in a very rural area, the little transformer powering my house provides about 60 amps at 240V single phase.
I use all electric heat, water heater, stove and hot tub.
The transformer does make quite a bit of noise when it is very cold and all the heaters are on and the 6KW hot tub heaters kick in, fortunately it only runs about 40 seconds at a time.
The voltage drops from 240 to about 225 volts (113-115 volts per hot leg) when drawing 60 amps, but that is a continuous (short term) load, audio generally draws only 10% or less average compared to the peak power.

That said, using a Speakerpower SP4000, which puts out 4000 watts at 2 ohms and is 90 % power efficient running off 120 volts will drop the voltage enough to make the lights dim visibly in my shop.
There is only about 40 feet of AWG4 connecting the transformer to the main breaker box, then 100 feet of AWG10 to the shop.

The switching supply amps are more power efficient, but having less capacitor storage per watt than the old "heavy metal" amps actually need a stiffer power source (higher power bigger mains transformers, heavier wire) to deliver the power.

Lighter amp racks, heavier cable trunks....

Art

Last edited by weltersys; 14th March 2013 at 04:38 PM.
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Old 28th March 2013, 02:38 AM   #1253
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Construction is done and I picked up a 18TBW100-8. It beat the old subs 80hz and below, especially under 40hz. In my quick tests, a pair of lab12's were parallel on one channel stereo, the 18TBW100 bridged which should receive twice the voltage. My V cone correction is on the baffle so compression is high. I'll run some sweeps when I get REW installed again and hopefully have a mrx528s present at that time.
I can't say enough good things about this. Thanks to Xoc1 and everyone else involved, I'll be making the switch.
Click the image to open in full size.
upload foto
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Old 28th March 2013, 12:17 PM   #1254
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Quote:
My V cone correction is on the baffle so compression is high.
V cone correction???
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Old 28th March 2013, 12:47 PM   #1255
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Originally Posted by bubblersound View Post
Looks nice! Are you going to stain it?
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Old 28th March 2013, 05:45 PM   #1256
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Quote:
Originally Posted by bubblersound View Post
V cone correction is on the baffle
Could you post a picture of what you're referring to please?
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Old 28th March 2013, 07:13 PM   #1257
epa is offline epa  Netherlands
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must be a typo
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one good thing about music ,when it hit you feel no pain.
so hit me with music
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Old 29th March 2013, 02:00 AM   #1258
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online photo storage
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Old 29th March 2013, 04:48 AM   #1259
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Hi Guys,
I took apart the first cabinet I built ,basically cause I messed up the some measurements,They were off enough to matter, so here is what I have replaced the incorrect building,1st Pic
The glue and PL is drying so the box is still open and braces will be added .Both are using a B&C 18PZB100,
The second box I built is the second picture and it starts putting out good bass at 18 hz with a sweep generator to a Inuke 3000 at quarter volume,It keeps getting louder up to about 250hz ,I plan to cross at 130 Hz, This box shakes the Sh T out of everything,walls Belly,Pants,keys,stomach,lol.Wife's dishes,lol.
I don't remember where the drawing came from,I used bigpicture to get the measurements to build it.
Nice build Bubblersound !!!!!!!!!!!!!!!!!!!!!! I hope it RATTLES the house,lol.
CHEERS
NS
Attached Images
File Type: jpg inside the good speaker.jpg (613.9 KB, 581 views)
File Type: jpg Revised cone correction layout3A.jpg (115.6 KB, 559 views)
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Old 9th April 2013, 02:53 AM   #1260
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While I don't want an exact copy of the Danley sub, I do want the best variation of this design however. Is the plan above the "best" so far and if so how does it change the current hornresp input data. I would like to model some B&C 15PZB40's (that I already have) and other drivers that I might upgrade to later. Thanks.
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