Topic: Rotel RMB 1066& Denon3805

[Full HD 3D]

 I would like to have inputs with regards to the Rotel(1066) 6multi-channel amplifier bridging it into 3 sets to power the front left,center and front right and at the same time bi-amping it with Denon3805.Is this possible?What are the consequences.Will there be a more detailed and improved soundstage? Do i power the speakers(Usher6371) low inputs with rotel amp and the high inputs with denon?Leave the surround rear and surround back to be powered only by DEnon too. Any suggestions regarding this setup.  Thanks in advance for all our DVD Gurus,Enthusiats

[ricky]

Hi ernie,this is a very cool set-up you have in mind,only consequence youll have is high electric bill since im sure you wont get out of your ht room anymore But may i ask if 6.1 or 7.1 channel set-up really that important to you?Bec if not then maybe you can just settle for the rmb1075(5x120w) to power your 5.0 speakers without doing the bi-amping route anymore.Rotels are very powerful and efficient so imo no need to bi-amped anymore and instead of getting the denon 3805 why not just settle also for the rotel 1066 or 1068 pre/pro since this will already be a killer set-up costing almost the same as your initial plan. Buying the denon and only using it just to bi-amped the fronts-center and to power the surrounds is a bit overkill and very expensive Or if you really want the denon then just pair it with rotel rmb1075 to power the 5 main speakers and the let the denon power the remaining side surrounds malaki ba diff sa price ng 1066 and 1075? ???And another good suggestion is if you can try to hooked up with another member here to audition your usher with his bi-amped set-up(for detail,soundstage and for lf or hf inputs trials) would really help you a lot decide on what to get.

[Munskie]

meron ba 3 channel amp sa mga rotel? dont ask me if im getting sars ah...m just wondering.....hehehe

[av_phile1]

I would like to have inputs with regards to the Rotel(1066) 6multi-channel amplifier bridging it into 3 sets to power the front left,center and front right and at the same time bi-amping it with Denon3805.Is this possible?

With regards using two different amps for bi-amping, the usual recommendation is to ensure the power amps used for the highs and lows have the same current gain.  That's a bit difficult to ascertain unless you have the circuit diagram.  You can just go by the power ratings.  

The bridged 1066 is said to deliver 150 watts x three.  I am not sure if that's RMS.  Pls check the manual.

The 3805 is said to deliver 120 watts x 7.  Again not sure if that's in RMS, pls check the manual.  

If they're in RMS, the difference is not that much but you will definitely be creating a less than level homogenous gain across the audio spectrum.  I think the 1066 has a screw-type level gain on the front which you can use to level match between the high and low, just experiment to your ear's preference.  

Just a note.    Unless the 3805 has active high and low crossovers in its preamp, this is not TRUE biamping.  YOu are simly bi-wiring through  different power amps.  Does your Usher speaker have extra terminals on top of the 4 bi-wireable terminals for bi-amping?  There are speaker brands that have this to bypasses the passive crossovers.  If not, you would just be actively bi-wiring,  True bi-amping requires an active electronic crossover in the pre-amp stage so each power amp is fed a separate set of frequencies.  An example of this is when using the receiver and powered sub.  This is true bi-amping as the receiver acts as an electronic crossover to filter the frequencies between the receiver's amps and the sub's amps.  

What are the consequences.Will there be a more detailed and improved soundstage? Do i power the speakers(Usher6371) low inputs with rotel amp and the high inputs with denon?Leave the surround rear and surround back to be powered only by DEnon too. Any suggestions regarding this setup.  Thanks in advance for all our DVD Gurus,Enthusiats

I guess you have no choice but to use the other channels of the 3805 for the surrounds in the configuration you have in mind.  

Alternatively, you can just use the 6 power amps of the 1066 to power the highs and the 6 power amps of the 3805 to power the lows (assuming the Denon has more more per channel), leaving one channel unused on un-"bi-amped."  Then all your speakers would be "bi-amped."

Now whether you'll experience improved soundstage, I leave that to you.  Because this is not true bi-amping, I cannot say.

[ricky]

meron ba 3 channel amp sa mga rotel? dont ask me if im getting sars ah...m just wondering.....hehehe

munskie wala eh, its either 2,5,6,7 and 8 lang meron so kung gusto mo 3channel use the 1066 6x60w bridge so labas nya is 3x120w

[Full HD 3D]

Hi ernie,this is a very cool set-up you have in mind,only consequence youll have is high electric bill since im sure you wont get out of your ht room anymore But may i ask if 6.1 or 7.1 channel set-up really that important to you?Bec if not then maybe you can just settle for the rmb1075(5x120w) to power your 5.0 speakers without doing the bi-amping route anymore.Rotels are very powerful and efficient so imo no need to bi-amped anymore and instead of getting the denon 3805 why not just settle also for the rotel 1066 or 1068 pre/pro since this will already be a killer set-up costing almost the same as your initial plan. Buying the denon and only using it just to bi-amped the fronts-center and to power the surrounds is a bit overkill and very expensive Or if you really want the denon then just pair it with rotel rmb1075 to power the 5 main speakers and the let the denon power the remaining side surrounds malaki ba diff sa price ng 1066 and 1075? ???And another good suggestion is if you can try to hooked up with another member here to audition your usher with his bi-amped set-up(for detail,soundstage and for lf or hf inputs trials) would really help you a lot decide on what to get.

Thanks! Sir for the inputs. My existing setup is Denon 3805 with Usher 6371 Front & Center. and 2 rel M150E(breaking in for a friend).KEF 2005.1 satellite+sub package was used for the surround back and rear. M just having the itch to bi-amp with rotel 1066 since it is cheaper than 1075 around 20t++.Thank u po again for the inputs

[Full HD 3D]

meron ba 3 channel amp sa mga rotel? dont ask me if im getting sars ah...m just wondering.....hehehe

Munskie,wala nga kaya i choose rmb1066 tapos bridge na lang

[Full HD 3D]

With regards using two different amps for bi-amping, the usual recommendation is to ensure the power amps used for the highs and lows have the same current gain.  That's a bit difficult to ascertain unless you have the circuit diagram.  You can just go by the power ratings. 

The bridged 1066 is said to deliver 150 watts x three.  I am not sure if that's RMS.  Pls check the manual.

The 3805 is said to deliver 120 watts x 7.  Again not sure if that's in RMS, pls check the manual. 

If they're in RMS, the difference is not that much but you will definitely be creating a less than level homogenous gain across the audio spectrum.  I think the 1066 has a screw-type level gain on the front which you can use to level match between the high and low, just experiment to your ear's preference. 

Just a note.    Unless the 3805 has active high and low crossovers in its preamp, this is not TRUE biamping.  YOu are simly bi-wiring through  different power amps.  Does your Usher speaker have extra terminals on top of the 4 bi-wireable terminals for bi-amping?  There are speaker brands that have this to bypasses the passive crossovers.  If not, you would just be actively bi-wiring,  True bi-amping requires an active electronic crossover in the pre-amp stage so each power amp is fed a separate set of frequencies.  An example of this is when using the receiver and powered sub.  This is true bi-amping as the receiver acts as an electronic crossover to filter the frequencies between the receiver's amps and the sub's amps. 


I guess you have no choice but to use the other channels of the 3805 for the surrounds in the configuration you have in mind. 

Alternatively, you can just use the 6 power amps of the 1066 to power the highs and the 6 power amps of the 3805 to power the lows (assuming the Denon has more more per channel), leaving one channel unused on un-"bi-amped."  Then all your speakers would be "bi-amped."

Now whether you'll experience improved soundstage, I leave that to you.  Because this is not true bi-amping, I cannot say.

THanks! Sir, The Usher speaker is rated at 4 ohms,sensitivity at 90db with 2 sets of speaker terminals. there is no additional terminals.The Rotel 1066 is in RMS

[av_phile1]

You could have a problem, a bridged 1066 requires 8 ohms AT LEAST per bridged connection.  Most bridged amps have this requirement.  Each amp in a bridged config will see half the load, so 4 ohms.  Each amp will have to be capable of driving 2 ohm load for it to dirve a 4 ohm load in bridged form.  While the rotel is high current capable of driving 4 ohm loads, I doubt if it can handle nominal 2 ohm loads. 

[ricky]

ah ganon ba bro may denon ka na pala, yung 1066 is 6x60watts at 8ohms rating na same as as the 1075 na 5x120w at 8ohms din.Wow 20t price diff but with that difference youll get 5x120w from 1075 as opposed to 1066's 3x130w,hirap decide ano? ;DBut one thing is sure whether you get the 1066 or the 1075 the sound quality will greatly improve with the rotel.

[Full HD 3D]

You could have a problem, a bridged 1066 requires 8 ohms AT LEAST per bridged connection.  Most bridged amps have this requirement.  Each amp in a bridged config will see half the load, so 4 ohms.  Each amp will have to be capable of driving 2 ohm load for it to dirve a 4 ohm load in bridged form.  While the rotel is high current capable of driving 4 ohm loads, I doubt if it can handle nominal 2 ohm loads. 

Sir av_phile1, The Denon 3805 is rated at 8 ohms, the rotel 1066 is rated at 4ohms after making 2 channels to 1 and the speakers are rated at 4 ohms. Does this mean that when i push through in acquiring the rotel 1066 and do the bridging, it might fry the amp?Thank You Sir!

[Full HD 3D]

ah ganon ba bro may denon ka na pala, yung 1066 is 6x60watts at 8ohms rating na same as as the 1075 na 5x120w at 8ohms din.Wow 20t price diff but with that difference youll get 5x120w from 1075 as opposed to 1066's 3x130w,hirap decide ano? ;DBut one thing is sure whether you get the 1066 or the 1075 the sound quality will greatly improve with the rotel.

Sir,THank You po. You all have been a big help. Sir av_phile1 was saying that we might encounter some problems sa  nominal rating.Bka may iban nakasetup na denon combi rotel na can give us feedback.

[sillyputty]

mga bossing...magkano po yung rmb1066?

[Full HD 3D]

mga bossing...magkano po yung rmb1066?

Rotel1066 =P=41200.00

[ricky]

Sir av_phile1, The Denon 3805 is rated at 8 ohms, the rotel 1066 is rated at 4ohms after making 2 channels to 1 and the speakers are rated at 4 ohms. Does this mean that when i push through in acquiring the rotel 1066 and do the bridging, it might fry the amp?Thank You Sir!

Pwede yung rotel kung bridge sya at 4ohms na ,yung denon ang medyo tagilid kasi 8 ohms rating lang sya. So if you push through with your purchase of the 1066 just use it alone to power your 4 ohms speakers,wag ka na mag bi-amped using the denon since 8 ohms yung denon mo.Im sure with just the rotel you will notice a very big difference in the sound quality of your usher. Just use the denon to power the rest of your speakers na lang.Galing ng idea mo bro

[av_phile1]

Sir av_phile1, The Denon 3805 is rated at 8 ohms, the rotel 1066 is rated at 4ohms after making 2 channels to 1 and the speakers are rated at 4 ohms. Does this mean that when i push through in acquiring the rotel 1066 and do the bridging, it might fry the amp?Thank You Sir!

I had the chance to talk to the main guy at Sound Dimension when I was considering getting the RMB1066 in 2004.  It was his recommendation that while  the rotel can handle 4 ohms per channel as it is, when bridged, each bridged connection will require 8 ohms because each channel will see 4 ohms - half the total impedance of the speaker.  That just confirms my theoretical understanding of what bridging two amps will do.  Each amp in a bridged config will see half the load.   Going lower won't necessarily fry your amp if you just listen at low volumes.  You just won't get its full power potential and expect it to live long at the same time.     Now if the rmb1066 manual says the bridged config can still handle 4 ohm speakers, then I won't quibble on this.

[av_phile1]

Totally forgot, I did download the RMB1066 manual in 2004 for reference and I just rechecked my PC.  It says clearly and I quote under the section Stereo/Bridged Mono Mode Selection:

"Bridged Mono mode more than doubles the power into a single speaker. Minimum speaker load: 8 ohms."

Underscore mine.  So there.

You can verify by downloading the manual from the rotel site here:  Just choose the model.
http://europe.rotel.com/support/owners-manuals.htm

[MAtZTER]

Then why not just get a 2x120w Rotel amp?

I got a 5 channel Rotel amp recently for bi amping and I am only using 2 channels for now, its all I actually need. I hooked up the center after a while , but still the 2 channels were good enough. The other channels are unused.

There was an audible difference in HT, I could hear more HF sounds that were a bit inaudible before. But the difference in audio/music was really big. The soundstage was wider and I could really hear the drums, percussions, and all those instruments in the HF spectrum.