confounded bridge

[Lost in Bass]

This place is amazing. I am overwhelmed with the amount of knowledge here. Almost intimidated to post questions.

I could spend days looking around here and I'm sure I would find all my answers.

If I may be so bold as to ask a simple involved question?

I have this uncontrollable desire to bridge my PL 700 and drive a mono 18" small bl box.

This motor is a survivor from a small PA we used in support of a 1980's club rock band. Came out of one of two racks which held 4 700's each. It is beat up bad, road scars and endless miles of road. Still works, but I wonder.

I would like to fix this up and bridge it.

I'm old and can't hear too well anymore, but I can still feel it. LOL

And please, do not suggest another approach. I can wheel my rocker in front of that 18 and feel like it is a fireplace.

Please feel free to support me!

Thanks, Al.

 

[Gepetto]

This place is amazing. I am overwhelmed with the amount of knowledge here. Almost intimidated to post questions.

I could spend days looking around here and I'm sure I would find all my answers.

If I may be so bold as to ask a simple involved question?

I have this uncontrollable desire to bridge my PL 700 and drive a mono 18" small bl box.

This motor is a survivor from a small PA we used in support of a 1980's club rock band. Came out of one of two racks which held 4 700's each. It is beat up bad, road scars and endless miles of road. Still works, but I wonder.

I would like to fix this up and bridge it.

I'm old and can't hear too well anymore, but I can still feel it. LOL

And please, do not suggest another approach. I can wheel my rocker in front of that 18 and feel like it is a fireplace.

Please feel free to support me!

Thanks, Al.

Sorry Al

PLs are single ended and not meant to be bridged.

Welcome to the forum though

 

[BlazeES]

I applaud "confounded bridge" as a post title and welcome to Phoenix!

 

[laatsch55]

Al, we are getting close to 500wpc into 8 with the WOPL's, sure you need to bridge it?? What Joe didn't say is that yes they are not MEANT to be bridged, but in theory it's possible with a bridging adapter but it's a long involved process and yes it could conceivably quadruple your powe but along with that comes----how ya gonna cool it?The heatsinks are not capable of driving 8 ohm loads HARD the way they are. I have some severly modded K-Horns I drive with a WOPL 1000 and when hitting SPL's around 130db it HAS TO BE fancooled..Methinks perhaps you should try a converted WOPL then decide if a bridged 700 is worth it.. BTW, I've always wanted to do it too, just to see if it could be done.....

 

[Lost in Bass]

You found me, I'm the guy that wants to. I looked into the Rane why not wye summing circuit and was not impressed with the weird impedance. I explored the requirements of bridging. There seems to be a discrepancy between phase shift and polarity shift. All of this I am not well versed in. I found some old Sonance line level stuff to try.

So now that I've decided to beat the crap out of this amp? Suggestions?

Thanks, Al.

 

[laatsch55]

White Oak it fist , here's the latest in the White Oak upgrades---http://forums.phxaudiotape.com/showthread.php/4747-What-We-ve-All-Been-Waiting-For-700-BP-boards!!!!!!!!!

And---http://forums.phxaudiotape.com/showthread.php/4772-Russ-Phase-Linear-700B-Going-Fully-Comp!!!!!!!

And---http://forums.phxaudiotape.com/showthread.php/4966-Jer-s-700B-Quasi-to-Full-Comp-Backplane-Build

 

[laatsch55]

Here's the bridging adapter article---http://sound.westhost.com/project14.htm

 

[Northwinds]

Bridging 2 WOPL's is overkill and unnecessary and will result in amps that run insanely hot. You will aready have enough power to blow up most speakers without batting an eye. Hell, my 400s can take out 300-400 watt per channel Cerwin Vega's in a heartbeat if I am careless. A standalone WOPL is a thing of beauty and power all in itself. As Lee said, a 400 took out some very high dollar amps including a bridged pair of McIntosh MC20s

 

[Lost in Bass]

You selling?

 

[laatsch55]

Selling what?

 

[Lost in Bass]

Right out of the gate

I asked you to support me, Bridged 700 mono 18". Yes or no!

Thanks. Al.

 

[Northwinds]

Here's the bridging adapter article---http://sound.westhost.com/project14.htm

I don't see any advantage to this with the deterioration of soundquality, I see a mushroom cloud if one is not careful though

 

[Lazarus Short]

I don't see any advantage to this with the deterioration of soundquality, I see a mushroom cloud if one is not careful though

I can just picture a room, with its walls, floor, and ceiling peppered with imbedded bits of copper, aluminum, and steel...

 

[Northwinds]

I can just picture a room, with its walls, floor, and ceiling peppered with imbedded bits of copper, aluminum, and steel...

Don't forget the cap spew when they explode LMAO!!!!!!

 

[Rex Everything]

You selling?

White Oak sells the kits. Lee may have some but I'd bet he sells the labor. He may even have a few completed ones to sell.

I asked you to support me, Bridged 700 mono 18". Yes or no!

Thanks. Al.

No!

 

[laatsch55]

Al, it's not a question of support, I can't tell ya how to integrate the bridging adapter to the driver board. I can tell ya how to assemble and install the White Oak upgrades, but it'll take a better hand than I to integrate that bridging adapter..

 

[Lost in Bass]

I'm here to find out, and it looks like you guys don't pull any punches. So I guess I'm in the right place. Give me enough time and I will figure you out. Allow me to look over the info and shoulder checks you gave me, and I'll get back to ya.

Al.

 

[laatsch55]

Bridging is not the "cure all" for massive power. There are certain limitations that are inherent in a bridged amplifier. The Brystons, the Mac's, the Levinsons are designed to be bridged and have a lot of circuitry involved. To retrifit an old Pl is a job for a very good tech, one who knows the ins and outs of a circuit better than I. I have some Home Brew K-horns built from Speakerlab plans that have the following compliment of drivers---

Crites 1526C 15 onch woofs
BMS 4592 2" compression drivers mated to some Martelli Tractix wood horns
B & C DE 10 tweets with a Tractix plastic hor
Al Klappenberger "Universal" crossovers.

The above combination will back out nails from the floor joists and make your ears bleed.....and do it at 400WPC.
Simply incredible, No CPR needed, just slap em in the sweet spot and crank it up....

The holy grail of driving some 18" woofs to concert levels is surely attainable without 2,000watts of 8 ohm power. Are those 18's 4 ohm or 8 ohm?

 

[laatsch55]

Ain't nothing to figure out. What ya see is what ya get. Just some good ol boys who love music and like some of it REAL LOUD, but it's gotta be clean, and that's what these WOPL's do...