Question about Technical Hifi IA-B750 / IA-S750 Amplifier

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How do I know if my subwoofer output is blown?

I have a Technical Pro IA-S750 and when I have it on any of the channels I get a garrgled sound coming from the subwoofer and I can't get it to put out the bass to the song that's playing. Is there any way to fix this?

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  •  Grubhead
    Grubhead May 11, 2010

    Is it a powered subwoofer?

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Throw the damn thing away

Posted on Feb 16, 2009

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2 Answers

I get a fuzzy sound out of the right speaker. New speakers and wires so that is not the problem


it sounds like a blown channel in the amp.open the amp and see if there are any fuses that might be blown.it might be a blown capacitor which a tech should be able to easily fix

Nov 03, 2015 | Marantz Amplifiers & Preamps

1 Answer

Who fixes technical pro amps


All these Pro Amps are highly Modular in design internally - the Electronics internally are Modules interconnected - if you are an Electronics Engineer you can order the Module burnt or damaged and fix it yourself - BUT DO NOT TRY THIS IF YOU ARE NOT EXPERIENCED . When bridging outputs always remember to match the Specified Impedance of the Speakers by the manufacturer.

Jun 13, 2015 | Technical Pro 4200W 2-Channel Power...

1 Answer

4-8 Ohm Output Overpowered?


You weren't by chance connecting a powered subwoofer to the standard speaker channels? Most powered subs require a dedicated output from the amp, otherwise you would be amplifying the signal twice over!

Mar 18, 2014 | TOA Electronics A912MK2 Amplifier

1 Answer

Channel A on my PMP 1280s is blown


This website appears to have diagram for it. You will have to register to log in. http://elektrotanya.com/?q=hu/content/how-change-site-language-english
May of been some other component burnt out. Only way is by test meter and testing. Quite possible transistor burnt out.
You should be able to test it in circuit for Short circuits.
If output transistors faulty make sure you check driver transistors as well. Hope some of that helps.

Nov 19, 2013 | Amplifiers & Preamps

1 Answer

No sound from either channel


Since it is a PA amp

• Check first if input signals are getting through the amp.

• Check if all the outputs are properly connected.

If you have already done, checking..


• Check for shorted power transistors, and extract in pairs.

If it powers up, without protect..


• Check again for possible additional components before replacing

the bad ones.


A good amp never produce an over of 0.7V on its output.

Sep 06, 2012 | Technical Pro PA-2000 4-Channel Amplifier

1 Answer

CHANNEL 1 DOESN'T. WORK. WHAT CAN IT BE?


Try changing your RCA leads, they may me faulty, if that doesn't work you probably Have a blown output amp

Aug 20, 2011 | Technical Pro TA-1250 Amplifier

1 Answer

Can you connect subwolfer as well as speakers with this amp


Well, PASSIVE subwoofers ARE speakers. And this IS an amp. You could use it for a subwoofer (bridged) or two. It would also support a sub on one channel and a different speaker on the other. It's your choice what you want to drive with it.

I'd take that 4250 watts claim with a HUGE grain of salt as no distortion or bandwidth spec is included with it. If the lights in your neighborhood don't dim when you turn it on it's pulling WAY less than 4250 watts.

Jun 23, 2011 | Technical Pro TA-4250 Amplifier

1 Answer

I don't have any instructions so i don't know how to hook up my speakers and the t.v for surround sound i have a carver avr 100


You should be able to online to the manufacturer of your products and download manuals. However, I will try to help.

Connect the sound output cables from your DVD player including, left/right(white/red) as well as the Coax output/input if your DVD and your Carver each have this feature for enhanced sound on certain DVDs, and connect to the matching DVD inputs on your Carver.

Then, connect your DVD video output either by use of your RGB(RED/GREEN/BLUE cables or an S Video cable to your the matching video inputs on your t.v.

On the back of your Carver, you will find outputs for left and right speakers, connect to the left and right speakers with proper wire. Make sure that the 2 conductor wire is connected with the same side(polarity) on all speakers for the best sound quality.

You will also find rear channel left and right outputs on your amp, connect those to your rear right and left speakers.

Connect the center channel speaker to the center channel speaker output on your amp.

If your Amp has a sub-woofer output and you have a subwoofer, make the connections on that as well.

Test all of the speakers with a feature that many amps have on the menu using your remote, simply called test. if all speakers are connected correctly you will be able to hear each one as they are individually tested by the amp. Hope this helps out.

Oct 05, 2009 | Amplifiers & Preamps

1 Answer

Hi i have an audio source 300 watt amp with a&b speaker outputs. the problem is that no sound comes from the left side outputs a or b. the right side works fine thank you mike


You have a blown channel. If you are experienced with electronics repair, use the right channel to assist in diagnosing the left. Both channels should be efectively identical. In most cases, the defective parts are the output transistors. You should be able to A/B the output amp sections.

Let me know if you need further assistance.
Dan

Jan 14, 2009 | Amplifiers & Preamps

1 Answer

Home amplifier


Hum is probably due to insufficent grounding somewhere. Make sure coax cables at input are good. Re-locate unit away from aplliances

Apr 12, 2008 | Amplifiers & Preamps

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