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tech question about PG x200.4 and lpl
Posted: Sun Apr 29, 2007 10:26 pm
by bdubs767
Been a while since I used an LPL so I need a refresh...
First question w/ the LPL connected to the x200.4 it only influences the rear channels right ?
Second w/ the LPL engaged does it bypass the onboard gain or work only up to the area where the onboard gain is set ?
Posted: Sun Apr 29, 2007 10:31 pm
by dedlyjedly
The lpl should work on any channel that's utilizing a low pass filter.
The gain on the amp determines the peak output level, which is achieved when the lpl44 is turned all the way up. The lpl only attenuates the signal down from this highest level.
Posted: Sun Apr 29, 2007 10:32 pm
by bdubs767
dedlyjedly wrote:The lpl should work on any channel that's utilizing a low pass filter.
The gain on the amp determines the peak output level, which is achieved when the lpl44 is turned all the way up. The lpl only attenuates the signal down from this highest level.
thanks jed,
Gay though I have to use the LP xover to use the LPL arghh...
Posted: Mon Apr 30, 2007 3:54 am
by 444 FED
So if all 4 channels were set to LP, the LPL would effect all channels?
On the subject of LPLs, any body have details of the control it self? resistance, pin out, etc? I don't have an LPL44, but have access to a lot of RBC-1s (JL Audio), and hope that I could just simply plug in a RBC-1 and work, or if slight modifications are needed, that would work for me as well.
Thanks
Posted: Mon Apr 30, 2007 4:35 am
by bdubs767
444 FED wrote:So if all 4 channels were set to LP, the LPL would effect all channels?
On the subject of LPLs, any body have details of the control it self? resistance, pin out, etc? I don't have an LPL44, but have access to a lot of RBC-1s (JL Audio), and hope that I could just simply plug in a RBC-1 and work, or if slight modifications are needed, that would work for me as well.
Thanks
Im almost positive the LPL is a 50kohm pot...
Posted: Mon Apr 30, 2007 5:25 am
by Thumper88
LPL44
My instructions are a little wrinkled, but there you go.
Posted: Mon Apr 30, 2007 5:41 am
by 444 FED
Thumper88 wrote:LPL44
My instructions are a little wrinkled, but there you go.
Thanks Thumper, you confirmed what bdubs thought.
The only additional info I need now is the other end of teh cable, where it plugs into the amp (or x-over
), is the pin out (colours) just standad telephone pin out? If it is I can verify if this other control will work, or what I may have to do to modify it.
Thanks again.
Posted: Mon Apr 30, 2007 5:54 am
by Thumper88
yea..
The phone (RJ11) connector is just like that image, viewing it from the top with the prong facing up.
The arrows pointing to the end of the connector.
Posted: Mon Apr 30, 2007 8:51 am
by VW337
Posted: Mon Apr 30, 2007 2:05 pm
by 444 FED
Ok, so if I set all 4 channels to low pass, the LPL will control the level of all 4?
Posted: Mon Apr 30, 2007 2:19 pm
by VW337
yes.
Posted: Mon Apr 30, 2007 2:27 pm
by 444 FED
Cool, thank you.
Posted: Mon Apr 30, 2007 2:28 pm
by VW337
I have yet to verify it on the xenons but to my understanding the LPL will function when ever the LP XO is engaged, this means it should still operate when set as bandpass as well................
Posted: Mon Apr 30, 2007 2:34 pm
by vin78
^^^ My fronts were wired that way at one point - so yes as Erin stated it works
Posted: Mon Apr 30, 2007 3:34 pm
by dedlyjedly
x3. I use bandpass xo on my ti500.4 for ti9's. lpl really kicks ass on my midbass!
Posted: Mon Apr 30, 2007 4:35 pm
by bdubs767
Posted: Mon Apr 30, 2007 5:31 pm
by Capital_M
Question, since the LPL only attunates(sp) the gain from its highest point (12db) why is the highest point labels at 12 db? Shouldnt it be 0 db at highest gain and then - 12 on the lowest?
Posted: Mon Apr 30, 2007 8:03 pm
by VW337
because that would make too much sense and would be a horrible marketing move saying "install this to turn your bass down", gosh..........
Marketing sense is the reasoning.
Posted: Mon Apr 30, 2007 8:07 pm
by bdubs767
VW337 wrote:because that would make too much sense and would be a horrible marketing move saying "install this to turn your bass down", gosh..........
Marketing sense is the reasoning.
thats my favorite thing about the clarion DRZ it actually gives you a real reading
Posted: Tue May 01, 2007 12:39 pm
by Capital_M
VW337 wrote:because that would make too much sense and would be a horrible marketing move saying "install this to turn your bass down", gosh..........
Marketing sense is the reasoning.
Posted: Tue May 01, 2007 9:58 pm
by dedlyjedly
No, I haven't gotten a damn thing done as far as a personal system!
I just had the equipment set up on the test bench for about a week!
Posted: Wed May 02, 2007 5:50 pm
by 444 FED
Well, tonight at work, I dis-assembled a JL Audio RBC-1 and a control from an Alpine PLT-5
The JL Audio control is a 10K pot, the Alpine is a 20K pot. Now if I were to use either of this as is, well the Alpine won't work as is, because it only uses two conductors, and I have to verify teh JL control is connected the same, anyway.... If I were to use thes pots at the lower resistance, I would just have less attanuation, correct? If I added a resistor or two in the circuit I could in theory make them work exactly as the LPL-44, correct?
The JL control would also have to be modified, for connections, since they bridge one of the outer tabs to the inner tabs, along with the wrong pin configuration.
Posted: Wed May 02, 2007 10:00 pm
by VW337
your guess is well placed.
The lower resistance will indeed yield less attenuation and once rewired should work to some extent.
