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Is an external amp recommended for my HT with 4ohm Fronts?
28 replies to this topic
Posted February 18 2013 - 04:14 AM
Hello, First thread, but have had this questions for years even after setting up my HT. I upgraded my beloved old but reliable Sony 5.1 AVR for a new Denon 7.1 AVR so that I could run multiple HDMI from Blue Ray, DirecTV, and SONY PS3 to one Projector. However, it feels and sounds like the Denon is not pushing enough power to get the full range of my fronts and therfore reducing my HT surround sound experience. Now my question is this...should I use a 3 Channel external amp for my fronts and use the Denon to power my surrounds and video switching/processing only? Or is this Denon sufficient to power these speakers? My front L/R and center are MB Quart rated for 4ohm My Surround Backs are MB Quart rated 8ohm. Subwoofer is 10" MB Quart with internal amp. I plan on buying 2 DEFINITIVE TECHNOLOGY DI 5.5BPS which are rated 4-8ohm, for surround speakers. One other note, I have seen posts about power issues and using external amps. FYI, I wired my HT on its own 20amp breaker and only have my sub, projector and audio equipment (AVR, DVD, PS3, Cable box) on this load. The lighting for this room is on its own breaker as well. My HT room is 13' x 22' x 7'.6". Recommendations are appreciate and hope once and for all I can get this solved.
Posted February 18 2013 - 06:38 AM
Just to add side note. I am looking for any recommendations or advise to the best set up of my HT room. I can go into more specific details of my equipment if some would be interested in helping me out. Thanks in advance for everyone's advise FYI have an Epson HD projector as video source.
Posted February 18 2013 - 06:42 AM
What Denon AVR did you get? Does it even have pre-outs?
Posted February 18 2013 - 07:03 AM
Update: Denon AVR 791 ( i believe has preouts) Speakers are MB Quart 2LC-404 Series...4 ohm rated at 100-150w.
Posted February 18 2013 - 07:05 AM
I checked...don't have the pre outs ( i thought it did). Question then is this Receiver ample enough for my speakers. These are really great speakers and I bought them in 2001, when still made in Germany. Just seems that the Sony I used with them sounded better then the new Denon. Your help is so appreciated.
Posted February 18 2013 - 07:29 AM
Without downloading the manual I can't find anywhere to see if anybody else has 4ohm on the 791. But considering it is the brother to the 1911...I would think 4ohm is pushing it. Typically I only suggest Yamaha and Onkyo(much more Onkyo) on any <$800* AVR purchase when 4ohm is the speaker of choice.. *original MSRP...not the refurb/b-stock/"sale"/street price.
Posted February 18 2013 - 07:43 AM
So what would you recommend to accommodate this set up? The Denon is only 2 years old, but sounds like it is not sufficient enough for my speakers and since no pre outs, I cant just ad a ext. amp for the fronts (which are 4ohm). I have put a lot of time and effort into this theater room, and my whole basement for that matter. I love this room and want to have a true theater experience. What is your opinion on the speakers? Bought them 11 years ago, way before available research via the internet. So i went off the advice of the salesman. How do they rate with others? Are they good speakers? Should I scrap the Denon (sell for what i can get) and go with something like an Emotiva UMC-200 7.1 Home Theater pre-amp and Emotiva UPA-700 amplifier (at a tune of $1000)??
Posted February 18 2013 - 07:47 AM
The 791 still sells for around $200 used(shipping included). The least expensive AVR where you don't lose anything is this one...but gain pre-outs...(incase you still think exterior power is necessary. But attempting to compare a 791 to the NR708...isn't fair.) http://www.ebay.com/...=item4d09aefba0
Posted February 18 2013 - 07:53 AM
By the way...I have the SR707*(year prior to the 708) and a 1008. There is definitely no "lack of power" with either. I used to run a pair of Dahlquist DQ10 with an Integra DTR 5.8(what would be the Onkyo SR605). *Tell you how much muster the 707/708 has...I'm currently reviewing these... http://www.svsound.c...series-speakers (the towers, dipoles and center)
Posted February 18 2013 - 07:56 AM
So in conclusion, the Denon just doesn't cut the mustard for my speakers? I went to the store with my speaker specs and this is what was recommended.... Makes me frustrated. What about my other option of the Emotiva set up. Any input?
Posted February 18 2013 - 07:59 AM
You can't do anything...with that AVR. You need pre-outs before you do anything. I would not have sold a 791. I would have stepped you up to an 891/890 at least, more than likely a 990. Unless you had to have 1.4. The 990 pulls twice the power off the wall over the 791. You have 4ohm speakers...so the gain drops(meaning you take less gain to create the power).
Posted February 18 2013 - 08:14 AM
Ok, Im a little novice to the whole gain/ 4 ohm output and power. That I guess has been my issue. I didn't know the right questions to ask when getting this AVR. But if That receiver is >$1000(Denon 990), would it not be better to go with a Emotiva set up which would also be around the same price but offer better platform?
Posted February 18 2013 - 08:17 AM
But...the Emotiva won't connect to your 791. You need the "pre-out AVR" before you do anything...and "pre-out AVR" are high end enough...you may not need the Emotiva anyway. And in Denon, you had to buy a 990/3310 or 991/3311 to get pre-outs.
Posted February 18 2013 - 08:25 AM
I understand... and i do very much appreciate your time and responses. I just looking to make this right. I meant get the Emotiva UMC-200 which is a 7.1 Home Theater Preamp/Surround Processor and then get a UMP-700 amp for the speakers. These two together cost $1000. THen i guess sell the Denon to recoup the cost. I just dont understand how my old Sony seemed to work well with these speakers, but a new Denon does not. You have any other suggestions or recommendations?
Posted February 18 2013 - 08:41 AM
Where are you going to find a UMC-200? I haven't seen one in months...and I'm in Chicago.
Posted February 18 2013 - 09:00 AM
I will look into these models. Thanks for your responses. You know anyone who want to buy a Denon AVR 791?....lol.
Posted February 18 2013 - 09:10 AM
Throw it on Fleabay. One sold not long ago for $150+ shipping... That is why I suggested the NR708. It is the same year...and the last few have sold just over $300.
Posted February 18 2013 - 09:46 AM
Be a big loss consider i paid a lot more less then two years ago...i think in the $500 range for this Denon. I re-checked my old SONY and found out why it sounded better. It clearly shows 4ohm compatibility for front and center speaker and even has a selector switch for 8ohm or 4ohm. Wish it had hdmi connections, I would just hook that back up.
Posted February 18 2013 - 09:50 AM
If it were you...go with the Onkyo Tx NR709 or Yamaha RX V671??
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