My take on eresseraca's Load Box idea.

[krankguitarist]

Re: My take on eresseraca's Load Box idea.

For clips of a PDI-09 in action, check out my soundclick page.

Those were recorded with my amp hooked up to a cab as well, so I wasn't able to dial in the amps real well. Now that I've got my weber attenuator things sound a lot better.

 

[skyydogg01]

Re: My take on eresseraca's Load Box idea.

the only thing I would have done differently was use more resistors. 4 - 32 Ohm resistors to be exact.

Reason 1: more resistors = more surface area = better heat dissipation
Reason 2: more resistors = more power handling = less chance of blowing something

 

[Virtual Kevorkian]

Re: My take on eresseraca's Load Box idea.

I just got a Weber, cause I wanted the attenuation, but I'll post clips soon of the 5150 with a simulated cab... it sounds ****ed good!

 

[innerdreamrecords.co]

Re: My take on eresseraca's Load Box idea.

Pure genius. And you can keep your chili recipe in there too.

 

[SpaceShipOne]

Re: My take on eresseraca's Load Box idea.

Didn't expect so many kind words! Thanks guys!

 

[devastone]

Re: My take on eresseraca's Load Box idea.

One of your heat problems is that you have the fan blowing in, but you have no exit vents for the heat. Or maybe it is pulling air out of the box, but again it doesn't have any vents for fresh cool air.

Take it from someone who has designed instrumentation for 20+ years, pop some more holes in the opposite side of the box (preferably an equal area to the fan holes, but not that important) and it will get alot cooler.

*EDIT*

You might want to consider putting some extra holes on the top or sides so air can flow through it, I can imagine those resistors getting pretty hot.

Oops, missed this post, sorry fbV. The best place to put the new holes is so it keeps the airflowing directly across the resistors. In the top would help too, but not as much.

But, all in all, nice job! Way to take things into your own hands!

 

[Guest]

Re: My take on eresseraca's Load Box idea.

Cool stuff!

I have mine soldered into a hammond-like effectbox, with 5 x 8.2k power resistors neatly lined up and a rotary switch for selectable 4, 8 and 16 Ohm.

Painted the box white yesterday so a decal, a thin layer of clearcoat and the final solder joints and it should be ready... I'm going for that pro look on this one

I don't have any vent holes in it yet though :scratchch Wonder if the 5 resistor version will get as hot as well. I might have to replace the bottom of the box with a piece of metal mesh instead (The bottom of the hammond box will be faced upwards).

Anyway I'll post pics of it as soon as it's ready...

Thanks for sharing Spaceship, and those clips sounded real good also! I haven't ordered the Palmer yet but will do it soon

 

[Vasshu the humanoid typhoon]

Re: My take on eresseraca's Load Box idea.

Unspent energy always gets hot

 

[devastone]

Re: My take on eresseraca's Load Box idea.

Unspent energy always gets hot

Yep, doesn't matter how many resistors you spread it out over, the final amount of heat put out is the same. All the power (watts) that you are dumping into the box instead of the speakers is converted to heat energy. More reisistors means that each one has to dump less, but in the box, the overall heat dissapated is the same. Hence the need for vents, and preferrably a fan to move the heat out of the box. Also, if you read the specs on those power resistors, they are only rated at their full power if they are mounted to a heatsink capable of dumping an adequate amount of heat which possibly includes active (fan) cooling.