Turning a stereo amp into a monoblock 

I thought of that too. But what about the strenght of the input signal? Wouldnt the voltage or amperage be divided? I have a stereo valve amp with only 13w per channel. Im thinking of buying another identical amp and use each as mono in this bi-amp configuration. Need to properly understand all the implications though

Thanks, Trevor, and welcome.

Everyone seems to be saying that. Why? I am curious. Has anyone tried it? Do they even sell inverter kits to do it?

Each amplifier channel see the load as 1/2 the impedance of what is connected to the output terminals. An 8 ohm resistive load looks like a 4 ohm load to each channel. This is not a problem to most amplifiers. However a lot of speakers that are rated at 8 ohms are not 8 ohms at every or sometimes any frequency. In addition they are reactive. Most bridgeable amps I have seen have multiple output transistors per polarity. hefty power supplies and have their protection circuits designed for operating in that manner. An example: An amplifier I have here is rated at 100 watts into 8 ohms. If that was all it would see, 4 of the 160 watt output transistors would be adequate. However it is bridgeable and designed for industrial use with low impedance loads, so it has 12.

@@edwardallenthree if the amplifiers are traditional class ab, you can modify them into a bridged amplifier with just one or two resistors and a little rerouting. whether designed to be bridged or not it's... well let's say, dangerous to the amplifier, to say the least. never recommended.

John Hodgson Oh I get it now.Thanks.

I tried it on my Yamaha and it really doesn't work, amplifier is going to sleep after that.

Belfast , Mexico here , Paul :-)

If the amplifier isn't fed with too hot signal it should be fine. But people should not try unless they know what they are doing.

It will not damage it....it will just play the positive sum of the stereo signal. i use a 3rd speaker on B ch. with both leads in the positive terminals of ch. B and anything panned in stereo comes out the 3rd spkr but mono signal like dialogue in movies only come out the A ch. spkrs. Been doing this with 2 ch. amplifiers since the 80's....Never had an issue with any amplifiers i used over the years.

Yeah I was thinking the same thing, very few modern amps have ANY kind of earthing on the output stage, all outputs are balanced and floating. That is one of the reasons you're able to brigde certain amps. A bit of confusing and contradictory info from Paul here

Yep. It's a relatively simple circuit. Built several in the past.

I use two bridged amplifiers onto a single subwoofer, with a dual voice coil, so one amp per coil. Works fine, though you'll want to gain match the amps/outputs. A good way of doing it is reverse the wires on one of the coils and try to null any sound, being careful not to turn it up too much and burn out the coil.

@@UniCrafter I modified an old subwoofer the opposite way. It had dual 4 ohm voice coils and a crossover network. I eliminated the crossover, put the voice coils in series and powered it with a subwoofer amplifier.

Can you do this with the rotel rb-1050?

@@scottstone1444 Well, again; you will of course need two of them. One for each stereo channel. My amps are RB 981’s with an output reaching 120 watts in 8ohm, your amps reaches 70 watts. But the construction is basically the same although your amps are some years newer. If you’re already satisfied with the output in your listening room you’ll probably hear a clear improvement in sound quality. It’s not that the output gets lower, it just stays the same. Or in reality a smidgen higher due to the fact that each channel now has a separate power supply as I understand it. But it’s not more than 5 watts or so. I must stress this again: It’s important that the amps are in normal stereo mode if you connect them this way. You can’t do pseudo earthed amplification with amps in bridged mode. You will destroy your amps that way. But otherwise it’s problem free😊 I got the idea from a Hifi magazine many years ago. I don’t remember which amps they used, but it was audiophile expensive amps with an output of around 60 watts. The listening team at the magazine were stunned by the sound improvement. Would like to hear from you if you try this👍

Thanks! I will let you know if I find a second 1050

@@scottstone1444 👍

I was about to say the same.

I wish he would explain many things a little better.

I think he doesn't know what he is saying anyway :-) .

@room-ten-oh-nine ! Hahaha

@room-ten-oh-nine ! Oh man I just looked at Jackson Pollock painting I pissed myself. Almost

I know what you mean. I get that too. It's like going into warp.

I never tried this. I get what you are saying but I don't think it will work too well. What you are explaining is kinda like what amplifier designers do when they double up on the output transistors so that each channel has four output transistors instead of two and they are basically paralleled up. But doing this by just connecting the left and right outputs in parallel is not the same thing electronically. I wouldn't recomended it personally. And even if it did not bother the amp, you wouldn't have as much to gain in overall output power as if you use the amp in bridged mode as described in the video.

Get a multimeter and check the continuity of the negative speaker terminal to the eath pin on the 3 pin plug, or if it's only a 2 pin plug, to the chassis metal of the amp or one of the earth shields on one of your analog RCA inputs and I guarantee on most amps it will zero ohms. A direct connection. That is ground sir.

@@marcusfred4480 Everything i have hooked up is 2 prong.NOTHING is grounded to the (earth). You can ask any GOOD electrician and they will tell you the earth rod pounded into the EARTH by your home does absolutely NOTHING!! Dirt is a terrible conductor.SIR.

@@jondoe6618 Ok. Fair enough. Only that wasn't what I was getting at. I am talking about what is considered 'ground' to the electronics of the amp. i.e what is at 0 volts potential relative to the rest of the circuit. This is the chassis, and also the shield on an RCA input. It's also the negative terminal on your speaker outputs, unless the amp is of a different configuration. But that's very rare.

Yes, I agree, but that's not what's happening. The current administration is making it harder and harder to even apply. I agree we need a system of laws and rules but I also believe in times of hardship we need to be a country that's welcoming rather than figuring out ways to bar entry and make people first apply to another country for asylum etc. There's a clear campaign against immigration on the southern border.

Total BS Paul. We have in place a way to take in 1,000,000 LEGAL immigrants every year. That's not enough for you? Every single one of the border jumpers have memorized exactly what to say to be "eligible" for sanctuary. We are NOT to to let them all in. Of course it doesn't matter to you. You're rich and semi-famous. You have the ability to not be affected by this invasion. You do truly excellent work with amps and audio, but you have stepped in it now! You're Wrong!

@@drteknical6571 I am curious about your statements, thoughts and anger. How have you been threatened or affected by this"invasion"?

@@Paulmcgowanpsaudio Paul ....your Biden-loving comments just cost you an avid fan. Bye.

People will stay-in they country if America stop exploiting and sucking them dry they destabilize every country or cause conflict to they benefits remember these words American interests

Yes.This is supposed to be our "Safe Space."

I agree. I am passionate about immigration, and tend to angrily argue with people over it. I can't help it.

@@edwardallenthree You're also brainwashed by the mainstream liberal news media. And clearly have no grip on actual facts.

@Edward Allen So you don't mind everyone knowing that you are a traitor to your home country? Figures. The Leftist Twits of America now think it's Politically Correct to overuse the terms racist, white supremacy, and undocumented migrant. Geez, that one takes the cake since by using the term you admit at the start that they are here without Permission from the government. If you think this is trivial, try to sneak over the border into most other countries and then beg for food and money. Go move into a neighborhood full of them in your amazing state and see how long you or your "stuff" lasts. News flash: now the Illegals are bringing out their terror weapon, the machete. Read this mornings news from SoCal. Look at several sites to find out that the attacker and the victims were all Hispanic. Since the attacker wasn't white, most stories will omit that part.

@@drteknical6571 Your obviously an undocumented, racist, white supremacist. My home countries are Ireland, and Germany. My ancestors were sick of a lack of potatoes and sausage, so I'm a citizen of the USA, I was born here. I'd go back if I could, but I'm stuck here, and it's heterogenous and getting more so, because of people like my ancestors, losers looking for a better life. I live in Albuquerque, it's great, but if your "stuff" is outside and not nailed down, or bolted down even, it will go missing. Garages too. It's a drug thing. Also cars go missing at a rate higher than anywhere else in the world, until a few months ago. APD cracked down, so now they are back to robbing houses. Stuff going missing has been around for thousands of years, go to any museum in England and check out all the stolen stuff (artifacts).

Kyle Reese yes nobody is really from anywhere.

Don't bring that up to lefties - they think the human race started here.

@@johannb4393 lefties assume that all people are equal and valid, all descendent from our African ancestors. They dare think everyone is worthwhile and has equal rights!

@@edwardallenthree no they don't. They never have, they never will. Their beliefs have always rested on who is "oppressed" more, therefore making laws to "benefit" those people, while bankrupting everyone who isn't involved with said special group. It's not equality you speak of, it is equity.

@@der_pinguin44 no, it's equality. You think what I want is to steal your stuff. I don't. I don't even want to give more stuff to others. I am a humanist. I am simply opposed to assigning human rights based on birth or identity of parents. That's it. What part of what I said do you not support? Seriously. What part?

so you make a statement that supports the fact that we are a nation of immigrants even more. take your resentments over people who probably have never hurt you personally, or affected your ability to provide for you and yours, somewhere else. there is some underlying issue with you that has your panties in a wad about immigration and I don't really care what it is, but deal with the source of your problem. I guarantee that it's not immigration, legal or otherwise.

Que está haciendo aquí ron damon ?

@Тайбирияс Чайковский why are you so mean?

I was going to say something to tease you (because I am passionate about civil rights), but then that other comment was downright mean. For the record, the fact that mentioning immigration, at all, gets lots of people to talk about how much they hate illegals is fucking sad as hell, and a sign that we are far closer to nazi Germany than we pretend. He mentions no policies, just a simple fact about our country, and lots of people make racist, hateful, unwelcoming, comments. Sad.

@@edwardallenthree yeah, really sad. normally when there is a problem it gets solved, but when Trump solves it then some lazy-people-who-lost-their-power who think their truth is the only truth (doesn't it sound familiar to those who know what fascism is?) scream out that the problem shouldn't be fixed even if it affects their fellow people... because it will be fixed by their opponent whom they lost... and all those "along-runners" as Paul in this video seem so childish... he seemed brightminded but this prolog showed that there is a big question mark...

It's an educational channel, not an entertainment channel. Apparently you need more education.

>doesn't know the difference between settlers and immigrants

@room-ten-oh-nine ! You know what the libs say... One day they say America has a "history of oppreshun and wyte supreeeeeeeeemacee" and all Americans should be ashamed, on the next day they say it has always been a "multicultrural utopian nation of immigrants" before Trump, lol.

@@edwardallenthree Progressives like superficial differences in appearance and sex, but uniformity of thought. In the 90s it was perfectly ok to have a variety films about the struggles of individuals of different backgrounds, ethnic or otherwise. With progressive media and entertainment the goal is to force everyone to make the same content with the same ideology and intent to normalize and manipulate behavior. Not that there weren't subversive films before, but it was the individual artist's choice, and the only thing holding the artist back was obtaining funding. If the money people didn't think it would sell or if blatant offense would cut into their bottom line then they would either moderate the content or it wouldn't happen. Now it's all the same agenda, and the companies don't care what their viewers think.

@@Frank_42 I don't understand what any of that has to do with the topic at hand. The only ideas I am trying to suppress are racist ideas. Yes, I have reported individuals for hate speech. That is because hate speech is wrong. You seem to be projecting the approach of Fox News onto "progressive media." An interesting argument, and not entirely wrong (but certainly not correct), and would be interesting to explore. **** But it has nothing to do with the fact that WESTEL AUDIO is arguing that white people and Asian people are better than black and Hispanic people, and should have the right to oppress black and Hispanic people because of their superiority. Read his comments. Look at all them. You will see he is racist AF. That is a problem that even a Fox News addict like you should be able to see. **** The fact is that there is no reason, none at all, to limit migration (at the moment). Arguments all come down to the one that WESTEL Audio makes above: that immigrants are stupid, lazy, criminals. That argument is slanderous, false, and evil. We can argue about what diversity means. We can argue about whether certain inequities are caused by systemic racism. But if you dare try to repeat WESTAL Audio's arguments that immigrants are bad people, and claim to not be a FUCKING BIGOT, then you are not worth any more of my time. If you want to talk immigration compromise, by the way, I am game. I would support a dramatic increase in legal immigration (to the point were supply and demand for labor are met) and a guarantee of support for refugees (up to, say, 1 million a year?) in exchange for more money for border security, as well as a system for identifying who crosses, and whether or not they are a criminal fugitive or suspected terrorist. We would have to, of course, find a humane way of documenting the undocumented as well.

@@edwardallenthree you're just a lousy stinking troll just admit it.

Stop Beijing disingenuous we talking about America which I guess you are a white person trying to excuse all the atrocities your people done to people of color all over the world .,you are immigrants to America

Ryan Schipp he’s be a horrible patriot to not challenge unjust laws.

@@graxjpg what unjust law are you referring to?

remember the Mayflower they had no visas :o

@@PooNinja its 2019. There are laws. Crossing the border border illegally is a crime. It's very simple to figure it out

I challenge you to explain why it should be a crime without racism.

Geerladenlad no liberals that I'm aware of are calling for open borders. That is what is known as a straw man argument.

For the record: America did have "open borders" until the Chinese exclusion act. Your ancestors came here legally because they were white and there were no laws against immigration. Welcome people. They aren't hurting you.

@@masonmorris3997 that's what I hear usually from liberals but that's what I hear. Maybe that was true once upon a time but now they flipped flopped on it. and you know what the funny part about it is they don't really care about these people trying to come into the United States they just want voters. I heard Barack Obama tell illegal immigrants to just go ahead and vote.

@British Naturalist you are arguing for reducing global population. I agree. Our economy, however, still values growth. How do we make that work? How do we add people without adding to the global population? I'll leave working out the rest as a mental exercise.

@@Geerladenlad your hate and racism are palpable. Why? Why do you feel the need to hate immigrants, liberals, or anyone else? What did they do to you? Why do you hate these people?

no one cares

@@ixfxi Apparently, 6 people do care.

He spends one sentence on that topic and you become triggered like a feminist lesbian.