[Rajith]

Dear Sam,
I am having a Sound stream 4channel installed in swift with 2 rear channel dedicated to sub,now i am finsing that if you just twist or rotate the RC cable near the amp or tap the amp with hand , we hear a thud thud sound in the Sub.Can u please guide me to sort the same out.
Rajith

[abhipuru16]

Originally Posted by abhipuru16

Hi
In my car, we have taken pre-outs from the mainboard of the stock headunit. The rear pre-outs are used to drive the subwoofer.
Now, today, I faded the headunit output all the way to rear. Then, while it was faded completely at rear I faded it all the way to left and then right. Whenever I faded to extreme left or extreme right the subwoofer output used to decrease and it would play at a lower volume.

IS THIS NORMAL?

Need more comments on this.

[thelord]

Yes its normal.
Reason - Bridging

Originally Posted by abhipuru16

Need more comments on this.

[abhipuru16]

Please help me solve this peculiar problem in my newly installed ICE. The problem is that we took pre-outs from inside the stock HU. Now, the front channel gains are set at around 50% giving out 23V (sqrt (130X4)), which is good. The problem is with the rear channel where the subwoofer is connected. There is literally no output from anything below 90% gains. Right now, the gains for the subwoofer are almost set 100% at which the DMM reads 38.2V (desired 40V) at full clip of the gain pot.
The voltage decreases rapidly if I go below "almost full gain". All this at maximum Headunit Volume.
What could be the problem?
Please note that I hear no unwanted noises or whines maybe because the subwoofer gain is set so high and not the front components'. Please help.

The amplifier is rated as 4X130Watts RMS or 2X400Watts RMS.

[abhipuru16]

Originally Posted by abhipuru16

Please help me solve this peculiar problem in my newly installed ICE. The problem is that we took pre-outs from inside the stock HU. Now, the front channel gains are set at around 50% giving out 23V (sqrt (130X4)), which is good. The problem is with the rear channel where the subwoofer is connected. There is literally no output from anything below 90% gains. Right now, the gains for the subwoofer are almost set 100% at which the DMM reads 38.2V (desired 40V) at full clip of the gain pot.
The voltage decreases rapidly if I go below "almost full gain". All this at maximum Headunit Volume.
What could be the problem?
Please note that I hear no unwanted noises or whines maybe because the subwoofer gain is set so high and not the front components'. Please help.

The amplifier is rated as 4X130Watts RMS or 2X400Watts RMS.

Please guys, I am losing my sleep over this.

[devarshi84]

What HU are you using? Does the HU have any Subwoofer settings? For eg Pioneer HU's have a setting that lets you opt between rear speakers and Sub.

Also how is your Sub wired if it is DVC?

[abhipuru16]

Its a stock Fiesta MP3 Headunit with Preouts "taken" (read soldered) from inside.
The subwoofer is the Infinity Ref1240SE which is a SVC subwoofer.

Is there a possibility that the rear channel RCA might be damaged, say pinched somewhere?

[chevelle]

i have stock ice in i20. i am planning to install 8 inch JBL GTO804 sub woofer and paired with JBL KAC M525 amplifier. I will be using stock speaker and stock head unit.

The sub-woofer will be on the parcel shelf and amp will be either below passenger seat or at the back.

I have been quoted Rs. 7000 for GTO-804 and M525 and JBL wiring kit. Is this a good buy? Any changes i should make to this set up?

Please advice.

Thank you.

[Sam Kapasi]

Originally Posted by chevelle

i have stock ice in i20. i am planning to install 8 inch JBL GTO804 sub woofer and paired with JBL KAC M525 amplifier. I will be using stock speaker and stock head unit.

The sub-woofer will be on the parcel shelf and amp will be either below passenger seat or at the back.

I have been quoted Rs. 7000 for GTO-804 and M525 and JBL wiring kit. Is this a good buy? Any changes i should make to this set up?

Please advice.

Thank you.

Hello Chevelle,

I'm suspecting a little misinformation. The KAC-M525 is not a JBL but a Kenwood Amplifier. A good one probably, Kenwood makes nice car amplifiers.

As far as JBL wiring kit is concerned, it is a fake wiring kit, (unless it is 2 year old stock). Don't go in that direction.

[chevelle]

Originally Posted by Sam Kapasi

Hello Chevelle,

I'm suspecting a little misinformation. The KAC-M525 is not a JBL but a Kenwood Amplifier. A good one probably, Kenwood makes nice car amplifiers.

As far as JBL wiring kit is concerned, it is a fake wiring kit, (unless it is 2 year old stock). Don't go in that direction.

Hi Sam,

Yes, i did got it checked yesterday and it was kenwood. I wrote it wrong. They only have this m525 2 channel amp in stock. Can you point out some similar JBL amplifiers?

If not from JBL, which wiring kit should i go for?

[abhipuru16]

I have no clue, please help!

Originally Posted by abhipuru16

Please help me solve this peculiar problem in my newly installed ICE. The problem is that we took pre-outs from inside the stock HU. Now, the front channel gains are set at around 50% giving out 23V (sqrt (130X4)), which is good. The problem is with the rear channel where the subwoofer is connected. There is literally no output from anything below 90% gains. Right now, the gains for the subwoofer are almost set 100% at which the DMM reads 38.2V (desired 40V) at full clip of the gain pot.
The voltage decreases rapidly if I go below "almost full gain". All this at maximum Headunit Volume.
What could be the problem?
Please note that I hear no unwanted noises or whines maybe because the subwoofer gain is set so high and not the front components'. Please help.

The amplifier is rated as 4X130Watts RMS or 2X400Watts RMS.

[nvc_4125]

i m looking for 2 din HU for my swift and short listed JVC KW-XR816 with 3 pre output with 5 volt and b/t connectivity it is worth to install it or i should look for other brand.
my range is 13000 k.

[Sam Kapasi]

Originally Posted by chevelle

Hi Sam,

Yes, i did got it checked yesterday and it was kenwood. I wrote it wrong. They only have this m525 2 channel amp in stock. Can you point out some similar JBL amplifiers?

If not from JBL, which wiring kit should i go for?

Well, like I said, most kenwood amps are top-notch quality and I cannot see a reason to look for alternatives. If you're a brand loyalist, you would then look at the GT5-S422 amplifier from JBL, which would be sufficient to drive the GTO804 8" subwoofer..

Wiring kits are available from many brands, Kicker, Monster, Scosche etc. On a budget you could even power it using Finolex cables and MX RCA cable.
Works fine and you will probably not notice a difference with your 2 channel amplifier.

[donarun]

Subwoofers sound best in which type of enclosure, wooden box or a FG enclosure assuming both are built to required volume specification ?

[navin]

Originally Posted by donarun

Subwoofers sound best in which type of enclosure, wooden box or a FG enclosure assuming both are built to required volume specification ?

FG has it's advantages - it is stiff and it can be moulded into just about any shape but it is not as non-resonant as good quality MDF.

MDF - is cheaper and non-resonant but cannot be moulded into complex shapes.

I have been advocating a sandwich of 2 layers of 4mm MDF and 2 layers of FG (which is about 4mm). This way you get a box that has walls of about 12mm (good enough for small boxes around 1 cu. ft) that is damped and easy to shape. 4mm of MDF can be bent quite a bit. Even easier is to use 4 mm marine grade ply.