Question about DHD NTX-2009 Car Audio Amplifier

1 Answer

Amp has 3 modes on it ,as a switch,what is this,it has a 2,3,4 channel mode,i have the gold dhd 1000watt x4 channel

My amp has a mode selector,2,3,4 mode switch built into the cross over section of the amp, it is the 1000watt 4 channel amp,which i have bridged into 2 channel driving 2x 12 inch pioneer svc 800watt subs,on my low level input i have 4 rca inputs which have an rca linked to it. MY QUESTION IS,WHAT MODE SHOULD I RUN THE AMP ON,TO REALLY MAKE MY WOOFERS POUND. OR WHAT DO YOU GUYS RECONMEND TO GET THE SUBS CRACKING,SO TO SPEAK.THE LPF IS @ 60HERTS,OF A PRE AMP WITH SUB MODE OUTPUT SWITCH SET AT 90HERTS,ITS A 7VOLT RMS PRE AMP. THE TROUBLE IS I FEEL THAT THE DHD NTX2009 COULD OFFER ME MORE THAN ITS DOING AT THE MOMENT. HELP HELP IT ,AT THE MOMENT GIVES ME JUST UNDER 140 DB,OFF A 2FARAD CAPACITOR. SEND A REPLY TO

Posted by on

  • guysaint Aug 22, 2007

    bridged into 2 channel from 250X4 into 500X2
    driving 2x800watt pioneer svc,how do i get this dhd ntx2009 to drive these spaekers at 2ohm stable?
    is it the wiring from the amp,
    the wiring to the spaekers?
    obviously 2ohm is better performance in terms of bass power.
    how do i get 2 ohm from this amp??????

  • regginalja2 Jan 30, 2009

    yes i have the same problem i bridged 1&2 to play two 10" bumper at 400 watts each and 3&4 to play top end but the bass keepindg on chippn out now only 2,3 and 4ch is working could u tell me what may have happen to ch1 and the amps is the same dhd 250watts x 4ch



1 Answer

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that hasĀ over 10 points.


    An expert whose answer gotĀ voted for 2 times.

  • Expert
  • 113 Answers

First thing 1000@4 means 250w per ch. which means150w usable power.the mode switch is only to reduce rca cables,use 2ch mode if only 1 pair rca available,60hz is a bit low for this amp,90 would work better.

Posted on Aug 22, 2007


1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017


Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Hi this is amber I have 2x4 ohm qvc audiobahn abass2012P how would I correctly run them to get best bass n max power efficiency I have a soundstream Picasso 1000watt 4 channel bridge able amp to hook em up...

I assume you are replacing the built-in Audiobahn power amplifier with your 4 channel Soundstream amp. If so, you can set the Soundstream for bridge mode which should net you 2 high power channels of 250Wrms@4ohms or 500Wrms total power (if the speakers are quad VC), or alternatively, non bridged for 4x125Wrms (if the speakers are dual VC). You can see why below.
Next, you need to confirm each subwoofers coil configuration as follows: If each woofer is quad, there will be 8 connectors; if dual VC, then there will be 4 connectors. For dual VC, if each VC is 4ohm, you can choose between 8 or 2 ohms by series or parallel wiring. If each VC is 2 ohm, you can have 4 ohms in series to use. This can be determined with an ohm meter across one set of VC terminals. If you can get 4 ohm for each speaker, this will allow you to use the 2 channel bridged mode with each speaker getting the full 250W. If each VC is 2 ohm, use non bridged mode and run each of the 4 channels to each VC. For this case, use a 2 to 1 RCA jack to sum the two channels for each speaker on the amp's input side to make the signal 2 channel instead of 4 channel. Below are examples of quad and dual VC for reference only, the wiring may not match your setup which will depend on your VC resistance (impedance) measurement. Don't forget to set your HPF(High Pass Filter) as this is a subwoofer setup.

quad vc-bsudq2jd4xz1a3m0o2e0expj-1-4.jpg

dual vc-bsudq2jd4xz1a3m0o2e0expj-1-7.jpg

Nov 17, 2017 | Car Audio & Video

1 Answer

I have a QSC RMX 2450 in which both channels are driven even though the amp is in stereo mode and I am only sending a signal into input channel one. It acts as if the amp is in parallel mode but I have...

My thoughts are that the amp has a poor channel separation but usually you can only hear a very quiet trace of the sound through the undriven channel. I agree with Taurus and make sure that the switch is making contact and moving all the pins to the proper points. This is a Home stereo amp, it comes with an extended 6 year warranty if you register it, I would check into getting a warranty repair before doing anything to it! Looks like a nice quality piece, those dip switches are a little bit confusing but the way it's built it is necessary to have them. It has a Dual Mono amp section so there is no way that any sound can be crossing over unless the swithches are directing it. The only way that can happen is in Parallel or in Mono. You could be in Stereo / Mono which would input both channels and output 3 settings a 1, 2 in Stereo & a Mono, Try hooking a speaker up to the Mono/ Bridge outputs and see if it's louder than just hooked up to 1 or 2. Parallel inputs will give you Mono 1 & 2 with Bridge off, and might give you Mono 1 & 2 with a bridged Mono if the bridge is on, like 3 channels all mono with one getting twice as much power as the 1 & 2 will put out. Although they have it labeled to not use it in those settings it's possible to do. I can see why you would be checking the switches.
It may actually be labeled incorrectly , as strange as it seems, many Chinese products have been made with labeling errors. Plus and minus have been wrong on Asian Made car amps so it's not that inconceivable that this may have some incorrect settings shown?

Apr 03, 2013 | Car Audio & Video

1 Answer

It was laying on the workbench in my kids stole the fusesWhat size fuses go in a koiiler model 9696 1000watt Max amp? To bridge this 4ch to 2 on the high input side. do you have to tie the input side??...

NO dont tie the inputs. Inputs stay just as they are. Outputs are where the bridging happens.
You amp specs are:
MAX OUTPUT POWER (2 OHM): 200W X 4 = 800W
60W X 4 @4 OHM (240W) LESS THAN 0.3% THD

So lets take 800 watts and divide by 13Volts DC = 61.54 Amps
So if there are 2 fuses start with 30 amp. To play it safe you could use 25 amps and if they blow try a 30. Now if the 30 blows you may need to take
another look at your wiring. I think 30 will be fine though.

Apr 02, 2011 | Car Audio & Video

1 Answer

With a kenwood amp 1000watt 170rms x 2 ,how should i really wire these up!

You haven't supplied any model #s so its impossible to say - but Kenwoods don't normally like 2 ohm mono loads.

You're going to have to either use one channel @ 2 ohm... or use each subwoofer per channel on the amp.

For a 2 Ohm mono load - wire all positives and all negatives from each sub to the amplifier's respective (bridged) terminals.

Thanks for using FixYa - a 4 THUMBS rating and POSITIVE TESTIMONIAL is appreciated for answering your FREE question.

Oct 07, 2010 | Sony Xplod (P589) Car Subwoofer

1 Answer

Hello. I have one (1) XS-L1035 being powered by a JBL gts 180X 2/1 channel amp. The sub works fine if i power two(2) subs thru 2 channels BUT if I try to bridge the power to one sub the amp cuts out. Is it...

It sounds like the problem is with the amp. try using the other sub in bridged mode and see if it still turns it off. If it still turns off then its definitely the amp. In 2 channel mode you are using each channel at 4 ohms right? and in bridged mode to 1 speaker it should be throwing a ton of power on a 4 ohm load as well,it should work fine bro -its gotta be the amp

Jan 30, 2010 | Sony XS-L1035 Car Subwoofer

1 Answer

Pioneer car audio amp GM 6300F (new)

Does your amplifier have a Channel swith which says 2/3/4 channel mode. If so and you are running the amplifier in Bridged mode, try changing the setting to 2 channel or Bridged mode.

Aug 20, 2009 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

I have a phonic powerpod 7. the speaker connections are A & B main 1 & the same main 2 in the middle there is 1 1/4 jack socket that says bridge. it says dont connect any speakers to a or b when...

In bridge mode, the left and right amplifiers are in essence connected together. Typically, the speaker connections are to the positive connectors for each channel for this mode. WIth the speakers still connected, you essentially shorted the outputs to ground and smoked the output section. The unit will detect this now and not turn on the output section. Your unit is in what is usually called "protect" mode. This unit will require repair. Expect to have the output transistors replaced at the very least. I would estimate around $16-$40 for parts.


Jul 01, 2009 | Audio Players & Recorders

1 Answer


This will depend on the amplifiers capabilities.

I will give 2 different scenarios.

#1 Stereo configuration

If the amplifier supports an RMS power output close to the RMS input power of the subwoofers then run the amplifier in stereo mode. For example 150 watts RMS X 4 channels driven at 20-20khz. (If you can provide a model # for the subs and the amp your looking at I can help you further with this decision.

Wiring for this is easy and simply involves matching the connectors for 2 of the channels (Front or Rear) to each of the subwoofers.

#2 Mono Bridged mode.

If the amplifier is lower power but mono bridgable you can bridge two Pairs of channels and power each of the subwoofers this way.

Generally speaking a 2 channel bridgable amplifier will be able to at least combine the wattage of each channel into a single monural channel and in many cases its actually higher.

So you would bridge the front 2 channels into a single bridged mode for one subwoofer. and then you could bridge the read 2 channels into another bridged mono channel for your other sub woofer.

For example if you had bridgable amplifier thats 50 watts RMS X 4 you coudl very likely (Generalization based on quality of amplifier) send 150 watts RMS to each subwoofer.

Again I would need to know what amp you're refering to to provide specific wiring instructions. Many Bridging amplifiers either have a single switch that will send them to bridged mode or you would use the positive + terminal from one channel and the negative - terminal from the other channel or a combination of both.

Sep 17, 2008 | Kenwood 12" 4-Ohm Single-Voice-Coil...

1 Answer


Hi monmax,
I hope you are aware that in bridged mode your amp will become monaural (single channel, double power). If you still wish to bridge it:
Switch of power.
Set mode switch behind amp to "bridge" position.
Connect speaker positive to CH1+ve terminal of amp output and connect speaker negative to CH2 +ve terminal.
Be aware that now, in bridged mode your amps output power delivery is 1100 watts for a 4 ohm speaker and 900 watts for an 8 ohm speaker. Make sure your speaker can handle that.

Mar 03, 2008 | Crown CE1000 2-Channel Amplifier

Not finding what you are looking for?
DHD NTX-2009 Car Audio Amplifier Logo

Related Topics:

319 people viewed this question

Ask a Question

Usually answered in minutes!

Top DHD Car Audio & Video Experts

Donald DCruz
Donald DCruz

Level 3 Expert

17130 Answers

Jeffrey Turcotte
Jeffrey Turcotte

Level 3 Expert

8832 Answers

Tygh Duval
Tygh Duval

Level 2 Expert

300 Answers

Are you a DHD Car Audio and Video Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides