Hey,
Ihope someone can help me with this amp problem I have.
I have a pioneer DEH P6500 Supertuner 3 D stereo. I also have a DHD Power Cruiser NTX 2007 amp and a Kicker CVR 10" SUB. I hooked up the amp per instructions and when the stereo turns on it thumps or when you turn the stereo channels it thumps. I can not turn up the amp very high because it has a bad back ground noise and the amp gets very hot. I also trying to bridge the amp and sub to see if it would make a difference and it did not.
Does anyone have any ideas how to fix this?
Replies (16)
dkh on 06/29/2006 11:51:13
How big of wires are running to the battery and ground cables on the amp?
Are you hooked up off the rca's on the h/u or through the speaker wires?
How did you ground the amp?
Where approximately is the gain setting at on the amp?
Bad background noise? Is it like higher frequency "squelching"?
Combination of bad distorted sound and amp getting really hot points to gain too high or the input load too high (from speaker wires off the headunit) which basically equates to the gain being too high.
dkh on 06/29/2006 12:34:06
I believe that after reading the DHD website on this amp that the solution to your problem is to remove your amp, throw it in the garbage unless you can return it for cash, and then go get a brand name decent amp. Checkout other postes for recommendations.
swez on 06/29/2006 13:37:54
Agreed... with a twist... This amp is a two channel model. If you bridge the amp to mono, and have a 4 ohm sub, it will be usable.
Comp VR's come in 2 flavors:
1. 4+4 Dual coils (DVC)
2. 2+2 Dual coils (DVC)
You need the 2+2 model to bridge this amp! Both coils wired in series will equal 4 ohms and safe for this amp.
Which sub version do you have here?
Also, make sure your amp and HU are grounded to bare metal on the floor pan of your vehicle. This may solve some of the noise issues.
Comments?
Swez
shampboys4 on 06/29/2006 14:36:38
The wires coming from the head unit are RCA but look like the speaker wires (kind of clear) the power wire and ground wire are of a heavy gauge and the ground is grounded at the rear seat bolt.
The back of the head unit has two RCA hook-ups and the there is two RCA 's that has a tag on it that says rear out put.
shampboys4 on 06/29/2006 14:43:24
If your recomending a good amp what brand might that be?
swez on 06/29/2006 21:15:35
Before recommending an amp for you, I need the model number of that sub.
Swez
swez on 06/29/2006 21:20:52
This DHD amp might still be useful to power full range intereior speakers. That is, if it has a High Pass Filter or full range selector in same. It seems to have decent power output, but DHD (and other off brands) often makes claims that are very incuurate. What is the fuse rating of this amp please?
Swez
shampboys4 on 06/30/2006 08:58:33
The sub has CVR10 and the amp has several swithes, the first being bass boost on/off, mode st/mo, LPF 30/250, x-over HPH/FULL/LPF, HPF 50/1k and says it is rated for a 30 amp fuse.
Itried to change some of the levels and I still get a loud thump when the stereo is either turned on or off and it also does this when the stereo is left on but you turn the ignition key off.
I really appreciate your help with this.
Bill
shampboys4 on 06/30/2006 09:02:20
I might add also that the sub recomended a 1 cubic foot box which I made.
swez on 06/30/2006 10:16:23
Bill,
I understand the amp features and all that noted. Thanks for clarifying what features it has.
The "thump" is common in cheaper amps that don't have a "soft start feature". This comes from the power supply within the amp, as the power storage capacitors charge and then discharge at start up of shut down. You can minimize some of that by setting the gains properly and using little or no bass boost. You might not be able to get rid of the thump entirely, but it can be minimized.
However, we have yet to identify what load the amp sees from the sub used. I see it is Kicker Comp VR 10". However, this sub has 2 versions. (2+2 or 4+4 DVC's) We don't know which version you have here Bill.
Do you have an ohm meter or the shipping box it came in? With that, we can determine the best way to wire this sub to that amp or, look for a Class D amp that matches this sub well.
The DHD amp you have now, may be used for mid/high speakers. With the HPF in use, the "thump" will be minimal as the HPF filters can block some of that thump.
Comments?
Swez
shampboys4 on 06/30/2006 10:38:49
Swez
Ok I think I now understand what your asking.
I found the paper work to the sub and it has a specification page but I do not see anything that says if it is 2+2 or 4+4.
Anything else i should look for?
swez on 06/30/2006 10:49:45
It might be marked on the shipping box or you may have to take the sub out of the enclosure and look for details on the sub magnet.
You may see this:
1. Kicker Comp VR 10, 2 ohm dual voice coils (1 or 4 ohms)
2. Kicker Comp VR 10, 4 ohm dual voice coils (2 or 8 ohms)
Swez
shampboys4 on 06/30/2006 10:52:42
Ok
It says 4ohm dvc woofer
swez on 06/30/2006 12:30:27
Good, now we know what animal we are dealing with.
This sub is rated at 300 watts RMS and can be use as a 2 or 8 ohm SVC sub or, dual 4 ohm stereo, depending on how it is wired to the amp.
If you use this sub and amp combination for now, it is best to wire 1 coil per channel to this amp. This will give each coil about 165 watts RMS per coil and adequate for this sub.
Now, here's the system setup process to use:
1. Your Pioneer HU is a 2.0 volt RCA output supply
2. That amp has a variable gain control, set it to midpoint of its travels
3. Set you LPF to on and use the 250 selection (not best for subs, but it should work)
4. Set bass boost between 0 to +3dB max.
This HU has a sub LPF feature as well. It is menu accessable and needs to be set per the Owner's manual. If you don't have a copy, get one here:
http://www.pioneerelectronics.com/pio/pe/vgn/images/portal/cit_11221/50163operation_manual_DEH-P6500_2003117151397330.pdf
See page 30 for the setup program selections for the HU's Sub filter feature. The best choice here is 80 Hz. This will block all highs to amp that are above 80 Hz. This is a good range for sub applications.
These adjustments are pretty much optimal for the gear mentioned.
If you can remove the HU safely, check the ground wire on the HU to harness. This ground should be connected to a bare metal contact location on the firewall or floor panel. (NOT THE HARNESS GROUND)
If you do this grounding step, that "thump" may be greatly reduced or go away entirely. The amp also needs a bare metal ground to the floor pan or a seat belt bolt. This will minimize any noise you may have experienced so far.
Comments?
Swez
shampboys4 on 06/30/2006 14:15:40
Thank You for all your help.
I will try this asap and let you know the out come.
Again thank you.
Bill
swez on 06/30/2006 18:54:05
Good luck Bill
Swez
Ihope someone can help me with this amp problem I have.
I have a pioneer DEH P6500 Supertuner 3 D stereo. I also have a DHD Power Cruiser NTX 2007 amp and a Kicker CVR 10" SUB. I hooked up the amp per instructions and when the stereo turns on it thumps or when you turn the stereo channels it thumps. I can not turn up the amp very high because it has a bad back ground noise and the amp gets very hot. I also trying to bridge the amp and sub to see if it would make a difference and it did not.
Does anyone have any ideas how to fix this?
Replies (16)
dkh on 06/29/2006 11:51:13
How big of wires are running to the battery and ground cables on the amp?
Are you hooked up off the rca's on the h/u or through the speaker wires?
How did you ground the amp?
Where approximately is the gain setting at on the amp?
Bad background noise? Is it like higher frequency "squelching"?
Combination of bad distorted sound and amp getting really hot points to gain too high or the input load too high (from speaker wires off the headunit) which basically equates to the gain being too high.
dkh on 06/29/2006 12:34:06
I believe that after reading the DHD website on this amp that the solution to your problem is to remove your amp, throw it in the garbage unless you can return it for cash, and then go get a brand name decent amp. Checkout other postes for recommendations.
swez on 06/29/2006 13:37:54
Agreed... with a twist... This amp is a two channel model. If you bridge the amp to mono, and have a 4 ohm sub, it will be usable.
Comp VR's come in 2 flavors:
1. 4+4 Dual coils (DVC)
2. 2+2 Dual coils (DVC)
You need the 2+2 model to bridge this amp! Both coils wired in series will equal 4 ohms and safe for this amp.
Which sub version do you have here?
Also, make sure your amp and HU are grounded to bare metal on the floor pan of your vehicle. This may solve some of the noise issues.
Comments?
Swez
shampboys4 on 06/29/2006 14:36:38
The wires coming from the head unit are RCA but look like the speaker wires (kind of clear) the power wire and ground wire are of a heavy gauge and the ground is grounded at the rear seat bolt.
The back of the head unit has two RCA hook-ups and the there is two RCA 's that has a tag on it that says rear out put.
shampboys4 on 06/29/2006 14:43:24
If your recomending a good amp what brand might that be?
swez on 06/29/2006 21:15:35
Before recommending an amp for you, I need the model number of that sub.
Swez
swez on 06/29/2006 21:20:52
This DHD amp might still be useful to power full range intereior speakers. That is, if it has a High Pass Filter or full range selector in same. It seems to have decent power output, but DHD (and other off brands) often makes claims that are very incuurate. What is the fuse rating of this amp please?
Swez
shampboys4 on 06/30/2006 08:58:33
The sub has CVR10 and the amp has several swithes, the first being bass boost on/off, mode st/mo, LPF 30/250, x-over HPH/FULL/LPF, HPF 50/1k and says it is rated for a 30 amp fuse.
Itried to change some of the levels and I still get a loud thump when the stereo is either turned on or off and it also does this when the stereo is left on but you turn the ignition key off.
I really appreciate your help with this.
Bill
shampboys4 on 06/30/2006 09:02:20
I might add also that the sub recomended a 1 cubic foot box which I made.
swez on 06/30/2006 10:16:23
Bill,
I understand the amp features and all that noted. Thanks for clarifying what features it has.
The "thump" is common in cheaper amps that don't have a "soft start feature". This comes from the power supply within the amp, as the power storage capacitors charge and then discharge at start up of shut down. You can minimize some of that by setting the gains properly and using little or no bass boost. You might not be able to get rid of the thump entirely, but it can be minimized.
However, we have yet to identify what load the amp sees from the sub used. I see it is Kicker Comp VR 10". However, this sub has 2 versions. (2+2 or 4+4 DVC's) We don't know which version you have here Bill.
Do you have an ohm meter or the shipping box it came in? With that, we can determine the best way to wire this sub to that amp or, look for a Class D amp that matches this sub well.
The DHD amp you have now, may be used for mid/high speakers. With the HPF in use, the "thump" will be minimal as the HPF filters can block some of that thump.
Comments?
Swez
shampboys4 on 06/30/2006 10:38:49
Swez
Ok I think I now understand what your asking.
I found the paper work to the sub and it has a specification page but I do not see anything that says if it is 2+2 or 4+4.
Anything else i should look for?
swez on 06/30/2006 10:49:45
It might be marked on the shipping box or you may have to take the sub out of the enclosure and look for details on the sub magnet.
You may see this:
1. Kicker Comp VR 10, 2 ohm dual voice coils (1 or 4 ohms)
2. Kicker Comp VR 10, 4 ohm dual voice coils (2 or 8 ohms)
Swez
shampboys4 on 06/30/2006 10:52:42
Ok
It says 4ohm dvc woofer
swez on 06/30/2006 12:30:27
Good, now we know what animal we are dealing with.
This sub is rated at 300 watts RMS and can be use as a 2 or 8 ohm SVC sub or, dual 4 ohm stereo, depending on how it is wired to the amp.
If you use this sub and amp combination for now, it is best to wire 1 coil per channel to this amp. This will give each coil about 165 watts RMS per coil and adequate for this sub.
Now, here's the system setup process to use:
1. Your Pioneer HU is a 2.0 volt RCA output supply
2. That amp has a variable gain control, set it to midpoint of its travels
3. Set you LPF to on and use the 250 selection (not best for subs, but it should work)
4. Set bass boost between 0 to +3dB max.
This HU has a sub LPF feature as well. It is menu accessable and needs to be set per the Owner's manual. If you don't have a copy, get one here:
http://www.pioneerelectronics.com/pio/pe/vgn/images/portal/cit_11221/50163operation_manual_DEH-P6500_2003117151397330.pdf
See page 30 for the setup program selections for the HU's Sub filter feature. The best choice here is 80 Hz. This will block all highs to amp that are above 80 Hz. This is a good range for sub applications.
These adjustments are pretty much optimal for the gear mentioned.
If you can remove the HU safely, check the ground wire on the HU to harness. This ground should be connected to a bare metal contact location on the firewall or floor panel. (NOT THE HARNESS GROUND)
If you do this grounding step, that "thump" may be greatly reduced or go away entirely. The amp also needs a bare metal ground to the floor pan or a seat belt bolt. This will minimize any noise you may have experienced so far.
Comments?
Swez
shampboys4 on 06/30/2006 14:15:40
Thank You for all your help.
I will try this asap and let you know the out come.
Again thank you.
Bill
swez on 06/30/2006 18:54:05
Good luck Bill
Swez
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