ADCOM Bridging?

[markw]

Excellent point.

Yep. If a speaker is a 4 ohm load with dips to 1 ohm, a bridged amplifier will "see" a 2 ohm load with dips to .5 ohm.

This is true for any bridged amp. Bridging + 4 ohm speaker = trouble.

 

[jeffsg4mac]

This is true for any bridged amp. Bridging + 4 ohm speaker = trouble.

Not for this one http://www.behringer.com/EN/Products/EP4000.aspx

 

[Pyrrho]

This is true for any bridged amp. Bridging + 4 ohm speaker = trouble.

No, not every bridged amplifier. For example, the Carver M-400 is 2 ohm stable in stereo mode, and can be bridged for use with 4 ohm speakers.

In general, the minimum impedance an amplifier can handle bridged is simply double the minimum impedance it can handle unbridged.

When I think about that Carver M-400 amplifier, which, I believe, was the first product of the Carver brand, it is no wonder that it caused such a sensation when it was released. A relatively inexpensive 201 watt per channel (into 8 ohms) stereo power amplifier, that is a small cube, and is stable into 2 ohms, and can also be bridged, that is something quite remarkable.

Many of them are still going strong after about 30 years of use.

 

[markw]

Well, I've heard of people surving being shot in the head but I'd still wanna go with the thought that it'll cause serious damage to most people.

 

[PENG]

Originally Posted by GranteedEV

Yep. If a speaker is a 4 ohm load with dips to 1 ohm, a bridged amplifier will "see" a 2 ohm load with dips to .5 ohm.

This is true for any bridged amp.

Mark is correct, no argument, this is based on known and proven electrical theories/principles.

Bridging + 4 ohm speaker = trouble.

I agree with Pyrrho. This is not always the case. Two amps have been mentioned so far that could do the job without getting into "trouble".

I don't like using compound multiple quotes this way but in this case I have to try.

 

[BoredSysAdmin]

Also my preamp died and I am looking at dropping $450 on a used Onkyo TX-SR875. Any thoughts????

I am soundless at the moment, other then the Victorla and need a pre amp.....

Onkyo 875 - the evil twin of my 805 (it's basically 805 + better video processing)
I think it's an overkill for pre-amp. 805/875 are notorious to overheat and fail.
You can not absolutely keep it in enclosed cabinet.
If you are looking for inexpensive 7.2 pre-amp look for Yamaha rx-v665 or checkout refub avrs on Ac4L for Marantz 6001 -
http://www.accessories4less.com/make-a-store/item/MARSR6001/Marantz-Sr6001-Receiver-100w-X-7ch-Hdmi-Home-Theater-Surround/1.html#!specifications


Regarding amp - I'd listen to TLS advice...

 

[markw]

I agree with Pyrrho. This is not always the case. Two amps have been mentioned so far that could do the job without getting into "trouble".

So, I guess the two posters before you are implying that most amps can be bridged and safely handle four ohm speakers. ...or do you think it would be safer to say that they are the exceptions to the rule?

Think carefully here...

I can always count on some pedantic show-offs trying to hoist exceptions to a rule up to try to show off. Now you see why the quote in my sig line.

 

[Adam]

...pedantic show-offs...

True, some people are pedantic, but others are just trying to make sure that the whole story gets told. I don't think these guys are just trying to show off or poke holes in your comment, Mark - just stating for the other readers that might want to bridge an amp that there are some out there that can take it. I could be wrong, but that's how I took their posts.

On a related note, someone stated in another thread that there are no longer any analog TV broadcasts in response to someone asking about TV tuner cards. I simply said that there are still some (as I get them on my OTA antenna) and pointed out the ones available in the OP's area. Based on the person's response, I guess he thought that I was being pedantic, but that wasn't my intention. I thought it was important information for someone looking to get OTA reception. The guy might think that there's no longer anything worthwhile over analog, but stating that it no longer exists is incorrect and can affect others who don't know any better. (Just a related story - I'm not trying to imply that you were stating wrong information.)

 

[AMC]

Onkyo 875 - the evil twin of my 805 (it's basically 805 + better video processing)
I think it's an overkill for pre-amp. 805/875 are notorious to overheat and fail.
You can not absolutely keep it in enclosed cabinet.
If you are looking for inexpensive 7.2 pre-amp look for Yamaha rx-v665 or checkout refub avrs on Ac4L for Marantz 6001 -
http://www.accessories4less.com/make-a-store/item/MARSR6001/Marantz-Sr6001-Receiver-100w-X-7ch-Hdmi-Home-Theater-Surround/1.html#!specifications


Regarding amp - I'd listen to TLS advice...

The Onkyo is available on Craig's list for $450, the Yamaha is not. I am thinking if I use the ADCOM as the main amp and use the other channels for the back speakers, it will not overheat. It is on my book shelf, plenty of air flow.

 

[BoredSysAdmin]

The Onkyo is available on Craig's list for $450, the Yamaha is not.

What's your point? Marantz 6001 on ac4l.com is $305 delivered to you

 

[jeffsg4mac]

Mark! what's the matter brother? didn't you see my smiley face? Are you off your meds again?

 

[PENG]

So, I guess the two posters before you are implying that most amps can be bridged and safely handle four ohm speakers. ...or do you think it would be safer to say that they are the exceptions to the rule?

I think they are exceptions to the rule, and I think they both know that too.
And once again, you are absolutely right about the first part, there isn't any exception to that rule.

 

[johnny phung]

I have the Odysseys.
It just seems like I get little bass from the drivers in the base of the unit. I have heard people who put 400W Emotiva amps on these seem to get great bass respond from the drivers. I get decent SPL from the pannels, but not the cone woofers. I was hoping to bridge and get more power to the ML's

Of course my GTP-750 died and now i need a pre amp, I am looking to purchase a used Onkyo TX-SR875 as a pre amp and use the receiver's amps for the souround channels. The guy wants me to pay $450 for it, thoughts??

I really need a pre-amp, as I am down to only a Victrola XX-IV for my music!!!!

Get yourself a Pass Laps amp, then your odyssey will shines. I have a pair of odyssey and driven by a pass lap X250 and let me tell you i dont want to change now. You hear everything, high, mid, bass very very crystal clear. Cant go wrong with Pass Laps bro

 

[lovinthehd]

Get yourself a Pass Laps amp, then your odyssey will shines. I have a pair of odyssey and driven by a pass lap X250 and let me tell you i dont want to change now. You hear everything, high, mid, bass very very crystal clear. Cant go wrong with Pass Laps bro

Uh huh

 

[fmw]

I have the Odysseys.
It just seems like I get little bass from the drivers in the base of the unit. I have heard people who put 400W Emotiva amps on these seem to get great bass respond from the drivers. I get decent SPL from the pannels, but not the cone woofers. I was hoping to bridge and get more power to the ML's

Of course my GTP-750 died and now i need a pre amp, I am looking to purchase a used Onkyo TX-SR875 as a pre amp and use the receiver's amps for the souround channels. The guy wants me to pay $450 for it, thoughts??

I really need a pre-amp, as I am down to only a Victrola XX-IV for my music!!!!

Add a subwoofer if you don't have one. If you had one I don't think you would be complaining about bass response. Bridging makes the amplifier see 1/2 the nominal impedance of the speakers. You may want to consider that in your plans.

 

[highfigh]

I have the Odysseys.
It just seems like I get little bass from the drivers in the base of the unit. I have heard people who put 400W Emotiva amps on these seem to get great bass respond from the drivers. I get decent SPL from the pannels, but not the cone woofers. I was hoping to bridge and get more power to the ML's

Of course my GTP-750 died and now i need a pre amp, I am looking to purchase a used Onkyo TX-SR875 as a pre amp and use the receiver's amps for the souround channels. The guy wants me to pay $450 for it, thoughts??

I really need a pre-amp, as I am down to only a Victrola XX-IV for my music!!!!

I wonder if the OP found a solution to the problem- this thread is from 2011.

 

[highfigh]

I'm posting this quote because it's backward-

"In general, the minimum impedance an amplifier can handle bridged is simply double the minimum impedance it can handle unbridged."

The effective impedance is half of the impedance on an unbridged amplifier with the same load.