Grey Z34

My two PG ZPA 0.5 amps require line drivers and have a PG PLD-1 running to each... I noticed that the sound was flattened out too. I was told by a PG rep that the reason is that the op-amps are setup for such a narrow bandwidth that the cut-off too much of the frequencies. I've heard that the Crystal Audio Linedrivers were some of the best...I preced them out and they were almost $800 a piece!

BTW, do you guys have any links to how I could modify my PG linedriver to get the more transparent op-amp?

[ January 02, 2006, 11:37 AM: Message edited by: Grey Z34 ]

Jaxom

Hey Grey Z34

It's easy, if you want to try different op-amps just remove the existing ones (desolder) and solder a high quality machined pin socket inplace. Then go spend lots of money on a bunch of different op-amps and plug-play. The high/low filtering can be adjusted too but that's more complicated as you may have to start looking at gain/frequency limitations of the op-amps.

Look for op-amps that have a high slew rate, typically 10 or better. Also a low noise level is good too, but not necessary (nV/rt(Hz)) If you want something cheap to start with try an AD712 from Analog Devices, I found it a cheap upgrade for the 5532's installed. Or you could send it my way [img]smile.gif[/img] , lol.

Good Luck, J

Cutra

iTrader: (3)

I tried out the Audio Control Linedriver and all it did was add noise, so I sold it yet the new owner said he loves it. I did originally install it at the front of the car (Fiero). There is only the front in that car.lol
Maybe it has to do with the deck you are using I don't know yet I'm glad I broke even on it.
I will be installing my EQT's soon that have a line driver in them so hopefully all will work out.

Grey Z34

Jaxom, thanks for the info. I have no clue what the adater looks like....Do you have any pics of the modified units?

Team Shadow

ive had a chance to try the new line drivers from PG. the sld44. and they are very nice. ultimate control. it seems that the car sounds better. but most importantly it allows for great accuracy with our setting compared to the tld22, tld2, tld66 and pld2. i have not tested it against other brands. but i can only imagine that it would fair well. we got 11 volts out of it rms and it did a 15 volt peak. all previous models only did 10v of less depending on the model.

[ January 06, 2006, 07:00 PM: Message edited by: Team Shadow ]

hershey

When using fosgate amps, I can increase the pre-voltage to 4 max. The amps cannot handle any more-they heat up and distort. Kenwood can handle up to 5+. They seem to handle higher voltages with less distortion.
Till now I used Alpine head units, but recently bought Kenwood Excelon unit- big difference in dynamics, separation, very pleased with sound.

Protege5

is it more beneficial to have the line driver up by your deck or back by your amps? i know fatty matty said it was better by your deck but then John Vroom said most of the post was inaccurate, so i was wondering what everyone else thought.

Haunz

iTrader: (3)

near the deck... if you put it near the amps it would amplify any noise in your cables, which defeats the main point of a line driver....

JohnVroom

For the record I never said line drivers didn’t sound good, nor did I say they cant make a system sound better. I said they cannot make a system more accurate nor can it make a system with noise quieter... but they could reduce the amount of noise added to the signal path. The noise rejection capabilities of a standard line driver are not profound but it could be enough in some systems (I am backing off my previous statement a little).

Placing the line driver nearer to the source is the common logic, and if there were any noise rejection benefits that would maximize it.

The balanced line drivers should be quite good at not adding induced hum/ noise

JohnVroom

BTW I do sometimes use a line driver