keep_hope_alive Premium Member
Acoustics Engineer
- Thread Starter
- #16
got a wide 1/0 cable that needed 3/0 copper terminals that i flattened/crimped in a vice then dented with a ballpeen hammer then covered in heat shrink.
sanded the floor and used a Grade 8 bolt and nut.
terminated the ground at the ultracap then continued to the amp.
power and ground is 4awg on the amp rack and will be fused at 100A. a 100A fuse will be on the ultracap feed also and using a MAXI holder allows for a quick disconnect.
i did some measuring last night to look for a good ground. used 2 awg to get from the battery negative back to the trunk and included test lead resistance. my fluke measured 0.2-0.3 ohms. testing various grounding locations, including where i chose, i did not get a measurable difference of more than 0.1 ohms. given the tolerance of the meter, that's pretty good.
i've located the factory grounds and engine bonding jumpers. they will be upgraded soon.
next i will install the LOC and do some RTA and oscilloscope testing on the HU output to characterize it's frequency response through the LOC. remember, the end goal is for the CDA-9887 to feed the Audison and be a clean source while the factory system feeds the 9887 AUX input for general listening, BT, etc. testing will determine if i'll use the HU volume or the 9887 volume. i already have the PAC interface to use the steering wheel controls for the 9887 if need be, though my preference is to use the 9887 as a preamp and use the factory HU volume control. in the end, system noise will determine what path i end up on.
i'll likely have an iPod with lossless demo music stashed in the dash and connected to the 9887 directly. I also have the KTX-100EQ and will use it if need be.
sanded the floor and used a Grade 8 bolt and nut.
terminated the ground at the ultracap then continued to the amp.
power and ground is 4awg on the amp rack and will be fused at 100A. a 100A fuse will be on the ultracap feed also and using a MAXI holder allows for a quick disconnect.
i did some measuring last night to look for a good ground. used 2 awg to get from the battery negative back to the trunk and included test lead resistance. my fluke measured 0.2-0.3 ohms. testing various grounding locations, including where i chose, i did not get a measurable difference of more than 0.1 ohms. given the tolerance of the meter, that's pretty good.
i've located the factory grounds and engine bonding jumpers. they will be upgraded soon.
next i will install the LOC and do some RTA and oscilloscope testing on the HU output to characterize it's frequency response through the LOC. remember, the end goal is for the CDA-9887 to feed the Audison and be a clean source while the factory system feeds the 9887 AUX input for general listening, BT, etc. testing will determine if i'll use the HU volume or the 9887 volume. i already have the PAC interface to use the steering wheel controls for the 9887 if need be, though my preference is to use the 9887 as a preamp and use the factory HU volume control. in the end, system noise will determine what path i end up on.
i'll likely have an iPod with lossless demo music stashed in the dash and connected to the 9887 directly. I also have the KTX-100EQ and will use it if need be.