Text only | Text with Images

Main Forums => Recording, Pickups, Live Sound, etc. => Topic started by: unsunder on June 26, 2007, 08:24:00 PM

Title: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: unsunder on June 26, 2007, 08:24:00 PM
I emailed lr baggs concerning the para di being a mismatch for the pwm.

Here's what they replied.

The Para D.I. has a 10MegOhm input impedance. You can place a 1MegOhm resistor between signal and ground, anywhere between the pickup and the Para D.I.'s input. It can be in the output jack of the guitar or in either end of the cable. The 1MegOhm resistor will interact with the 10MegOhm input resistor and cause the input impedance to drop to just below 1MegOhm. This should address the extra bass caused by the Para D.I.'s stock imput impedance bring so much higher than that of the pickup signal.

Does this sound correct? What's the best way to insert a resistor in a cable?
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: ronmac on June 26, 2007, 08:32:42 PM
As they say, you can place it anywhere in the signal chain between the pickup and the input of the PADI. The easiest way to achieve this is to solder a 1 megohm resistor across the signal and ground connections of the pickup output jack.

Remove the jack from your guitar, unscrew the shield and solder one end of the resistor (polarity doesn't matter) to the white wire connection and the other end to the ground wire connection.
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: unsunder on June 26, 2007, 09:36:12 PM
Quote from: ronmac on June 26, 2007, 08:32:42 PM
As they say, you can place it anywhere in the signal chain between the pickup and the input of the PADI. The easiest way to achieve this is to solder a 1 megohm resistor across the signal and ground connections of the pickup output jack.

Remove the jack from your guitar, unscrew the shield and solder one end of the resistor (polarity doesn't matter) to the white wire connection and the other end to the ground wire connection.

Is it better to install this in the jack of the guitar or in the cable? In case I ever use it without this preamp.
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: ronmac on June 27, 2007, 05:37:56 AM
Either is OK, although if you install it in the cable you are pretty much going to be dedicating that cable to this setup only.
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: karl2795 on July 05, 2007, 11:11:26 AM
Hello all,

Thanks so much for the info.  I've struggled with taming the low frequencies on my OM-03R SH with pure mini's ever since I installed the pickups.  I wanted to test how this 1 Megohm resister would sound before soldering one into my endpin jack, so I wired a little 1" x 2" project box from Radio Shack with a 1/4" male and a 1/4" female (with the resistor across it) at right angles so I could plug the box right into the guitar and plug my cord into the box.  This made a HUGE difference for the better- not only in taming the lower frequencies but in making the guitar really sound more like itself when it's unplugged.  When these Cleartone's wear out, I'll remove the endpin jack and make it permanent.  Thanks for the fix!
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: jimmyd on July 19, 2007, 10:20:19 AM
Quote from: karl2795 on July 05, 2007, 11:11:26 AM
Hello all,

Thanks so much for the info.  I've struggled with taming the low frequencies on my OM-03R SH with pure mini's ever since I installed the pickups.  I wanted to test how this 1 Megohm resister would sound before soldering one into my endpin jack, so I wired a little 1" x 2" project box from Radio Shack with a 1/4" male and a 1/4" female (with the resistor across it) at right angles so I could plug the box right into the guitar and plug my cord into the box.  This made a HUGE difference for the better- not only in taming the lower frequencies but in making the guitar really sound more like itself when it's unplugged.  When these Cleartone's wear out, I'll remove the endpin jack and make it permanent.  Thanks for the fix!

Did you solder in a 1 or a 10 Meg resistor? Just curious.
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: karl2795 on August 06, 2007, 02:29:27 PM
I used a 1 meg resistor.  It seened to do the trick.

karl2795
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: jimmyd on August 07, 2007, 07:44:11 PM
Thanks again for the info. I installed a K&K on one of my guitars last week. It has suprising volume for a passive but the eq is all over the place patched straight into a PA. I ordered a Para DI because of the eq features.  Think I'll make up a short two foot male to female jumper with the resistor to maintain the flexibility to use the amp or pickup seperately without the mod.
Title: Re: Modifying a Para Di for Pure Western Mini Impedence match.
Post by: rockstar_not on August 08, 2007, 01:26:32 PM
I have been EQ'ing my PWM signal in my recording software to roll off the low end - I plug directly into the intstrument inputs on my PreSonus Firebox, but I'm thinking it's time to make up a cable to keep in the case with the 1 MegaOhm resistor across the signal/ground wires.

-Scott
Text only | Text with Images