ART Cleanbox mod thread

[Canadian_Dude]

So what the input impedence for this?

[bobgpsr]

Canadian_Dude wrote:

So what the input impedence for this?

Hmmm, not sure exactly at this moment -- not at the Cleanbox's location. IIRC it is a 0.047 uf cap going into a 100K (?) pot feeding a very high impedance op amp. So use 100000 ohms (the pot's resistance) for the R in the previous equation.

Better yet measure the pot's resistance value with a multimeter. It could be 10K. Or did one of the early posts mention the input pot's resistance?

Edit: Checked back with Ilkka's measured results . So 0.047uf and 100K ohms gives 34 Hz for the -3 dB point which approx matches Ilkka's test results.

[Canadian_Dude]

Thanks for the info but I already went ahead and used a 1uF cap. Here is before and after:
http://www.hometheatershack.com/foru...tml#post107393

[ringbearer3791]

I have a quick question regarding use of and need for the cleanbox. I just recently completed my subwoofer build and am powering with an ep2500. It is currently connected directly from my receiver to the amp with a rca/xlr cable. The receiver is a denon 4306 which states it has a subwoofer preout sensitivity of 1.2V and the 2500 lists its input sensitivity as 1.23V. I currently have the subwoofer gain on the receiver turns all the way up and signal is definitely getting to the sub but I was wondering if the cleanbox is necessary/will improve amp output. Thanks.

Josh

[Mike Cason]

I have an Arts box and even modified it like some of the members did with the new 1 uf caps, but I didn't like it after 2 minutes and took it out and shelfed it.

I ordered a Reckhorn B-1 from CSS for about $85 bucks shipped. (from Washington state).

You can cut off all of your protection limiter switches on your amp and take full advantage of the power of the Europower. The limiters restrict some of the bass output. The Reckhorn is an easy install and uses rca cables instead of the more expensive XLR type.

It provides subsonic frequency protection, bass boost from 20 hz and up, and has a high pass filter.

This one of the best pieces of equipment I have in my HT equipment rack. It has a finely machined case and the controls feel very high quality. It is built in Germany with their superb engineering.

I had our Houston Soundsplinter DIY group meeting here Sunday and everyone was impressed with it's performance.

Click on the CSS link on my dealers page of my website to order it.

Have fun,
Mike