Going active
05-19-2009, 11:42 PM
#11
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2008
Posts: 819
Ok so i changed a few things again... Got a CDA-9887, PXA-H701/RUX-c700 and some CDT es-4 mids.
This is what ive done to the factory teminals
I am also workin on an amp rack for my 2 Arc and they will go under the passenger seat
Still lots of things to do and no time... but it's still fun
This is what ive done to the factory teminals
I am also workin on an amp rack for my 2 Arc and they will go under the passenger seat
Still lots of things to do and no time... but it's still fun
05-21-2009, 08:26 AM
#13
I know the feeling of always changing your mind and plans.
Anyways that H701 is a great tool, a lot of fun and easy to use..and it's tuff unlike the RF units.
I just sold my h701 on ebay for a rediculous amount.. 2 weeks later I find one local for 200$ ... lucky me.
Anyways that H701 is a great tool, a lot of fun and easy to use..and it's tuff unlike the RF units.
I just sold my h701 on ebay for a rediculous amount.. 2 weeks later I find one local for 200$ ... lucky me.
05-21-2009, 01:33 PM
#14
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2008
Posts: 819
lol, thanks again for the h701!
But before changing my mind again, I want to try this setup first! I think i have all the equipement i need to obtain good SQ , now it's just a matter of installing everything properly and find a trained ear to tune it.
The only thing i am afraid is the ES-4 location, but i have to try the easy way first, right?
The only thing i am afraid is the ES-4 location, but i have to try the easy way first, right?
06-05-2009, 03:53 PM
#15
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2008
Posts: 819
So now i am waiting for my new RCA to clean up the wiring.
I also plan to une some loom to protect the wires, unless there's something "better" out there
As for the sound, i have the famous zipper noise but I can live with that and i will need a trained ear to tune this thing... i know there's something wrong but i cant put my finger on it. It sound good, but with certain song it sound unbalanced.
I also plan to une some loom to protect the wires, unless there's something "better" out there
As for the sound, i have the famous zipper noise but I can live with that and i will need a trained ear to tune this thing... i know there's something wrong but i cant put my finger on it. It sound good, but with certain song it sound unbalanced.
06-10-2009, 01:08 PM
#17
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2008
Posts: 819
Found this on the interweb
But one thought I have regarding the "poping" or clicking noise during volume changes. Especially since it's worse at high volumes ... this may be a classic case of so-called "zipper noise" ... essentially the audible artifact of "step" changes in volume with electronic (that is, not analog potentiometer) volume control chips.
Generally speaking, there are two ways to combat zipper noise :
1. Algorithmically "ramp" the volume in a gentle fashion when the user requests a volume change. This must be implemented in a DSP chip inside the unit.
2. Wait for a "zero crossing" of the signal, before you implement the volume change requested by the user. The signal will NOT have an abrupt level change ... the culprit of zipper noise ... if the gain change occurs when the signal is zero This can be implemented in a DSP chip inside the unit, or there are some volume control chips (like the lovely Wolfson) that have this function built-in.
Now I recall in my review of the H900, that the volume control chips used did NOT have any of these options in them. So we concluded that the DSP chips in the H900 must be implementing one of the two above algorithms to avoid zipper noise (since there have apparently been no complaints of zipper in the H900).
So here's a speculation ... perhaps, since the DSP horsepower of the H700 is of course less than that of the H900, some shortcuts were made in the volume control algorithms? I know that's not a very satisfying answer for the user
Originally Posted by CARSOUND.COM
But one thought I have regarding the "poping" or clicking noise during volume changes. Especially since it's worse at high volumes ... this may be a classic case of so-called "zipper noise" ... essentially the audible artifact of "step" changes in volume with electronic (that is, not analog potentiometer) volume control chips.
Generally speaking, there are two ways to combat zipper noise :
1. Algorithmically "ramp" the volume in a gentle fashion when the user requests a volume change. This must be implemented in a DSP chip inside the unit.
2. Wait for a "zero crossing" of the signal, before you implement the volume change requested by the user. The signal will NOT have an abrupt level change ... the culprit of zipper noise ... if the gain change occurs when the signal is zero This can be implemented in a DSP chip inside the unit, or there are some volume control chips (like the lovely Wolfson) that have this function built-in.
Now I recall in my review of the H900, that the volume control chips used did NOT have any of these options in them. So we concluded that the DSP chips in the H900 must be implementing one of the two above algorithms to avoid zipper noise (since there have apparently been no complaints of zipper in the H900).
So here's a speculation ... perhaps, since the DSP horsepower of the H700 is of course less than that of the H900, some shortcuts were made in the volume control algorithms? I know that's not a very satisfying answer for the user
06-13-2009, 11:53 PM
#20
500 Watt CAFz'r
Thread Starter
Join Date: Sep 2008
Posts: 819
I replace the 9887 with a dva-9861... Weird i think the dva sound better, should it?
I also got my new RCA, i should have finish cleaning the wiring before the show on the 21...
I also got my new RCA, i should have finish cleaning the wiring before the show on the 21...
Last edited by lpchouinard; 06-13-2009 at 11:56 PM.
