At the moment my N9000 amps bi-amp the front speakers...if I was to get rid of bi-amping and instead leave the amps as they are in BTL and rewire each lead to the +ve(R) and -ve(L) of each speaker output on the amp then straight to the speaker, what will happen to the performance...just curious.
If am not clear please let me know so that I can try to reword it...basically having the N9K act as 1 amp driving a speaker without bi-amping
Joined: Dec 13, 2005
From: Coffs Harbour-AUSTRALIA
Posted: 2007-10-20 04:27
G'day tcgalo, My suggestion is A-B-C test. A- Compare single cables from your N9000 with the bridges put back on the L & R speaker box terminals .B-Then biwire them back to single terminals on the N9000 amp (removing the Bridge on the speaker boxs again). C-Leave bridge out from speaker boxs leave biwiring connected on speakers and change back to bi amping terminals again back on the N9000( they way you originally had it connected before you had this whole idea of change). Try these tests with the one stereo CD playing the same section of music for the same 60 seconds of music then try different CD's doing the same again.
I have some experience with the TAN in BTL mode, and that mainly includes packing up my beautiful SS-X70ED towers and carting them to the Sony repair place to have the drivers and woofers replaced.......
Consequently, I have just regined in my TAN by taking it off BTL mode and just using it as a 2 ch AMP for my fronts.
The comparison was made over a period of weeks unfortunately while the 7's were away getting repaired, but I havent been missing the BTL mode too much, certanily soundnig nice and deep from the front end still.
So my recomendation: 1. if you're going to BTL your TAN (and turn it up!) make sure your speakers are 200W capable? (Mine are 150)
2. I dont think you'll hear a difference, but everything in AV is a matter of degrees isn't it
----------------- This is the last thing I need for my HT - now i'm finished!
Joined: Jan 20, 2003
From: Tampa Bay FL.
Posted: 2007-10-28 09:24
I agree with the Craig & Mav....Really only you can answer that question...In your system, with your speakers, in the room they work in...
All of those variables can only be reproduced by you...
But to question a bit further.... How large is the room ? How efficient are your speakers ? Do they require a lot of power to get the SPL and Dynamics you desire ?
If they are efficient and do not...Then you may not notice much, if any difference with the extra power....You may even be able to run in the standard output mode without noticeable difference if your system/room and requirements are such that the power will never be needed...
But on the other hand the TA N's May not have to work as hard to produce the same output if you Bi-Amp...If they sound good but run hot is one good indication they are working hard to produce the levels and dynamics you are accustomed to...
Though not a good tool for dynamics prediction/measurement...(Is there a better one besides your ears ?) Here is a SPL calculator you may have fun playing with to maybe help some with your answers....Just enter different wattage factors and hit calculate every time you change a value... You should be able to get an idea of how much wattage is needed in your room to maintain a given average SPL level...
Do you have a SPL meter to get an Idea of your normal listening levels....Or to measure Dynamic peaks in SPL ?....That tool could help too...
Sony DA5ES Parasound HCA2205A (Bi-amping Mains and center)Sony TA-N9000ES (BTL+1 running Surrounds) Sony CX985 400 Disc DVD/CD Definitive Tech..BP30 MainsCLR 3000 Powered Center w/10" sub BPVX/P Surrounds w/dual 6.5" subs ea SVS 20-39PCi Sub
[ This message was edited by: SPCOOLIN on 2007-10-28 11:17 ]
I was just wondering what might happen....but with speakers ending in the SONY service centers...got me thinking.... Speakers 86 db 3.2-8 Ohms Reference listening level 70dB sitting exactly 9ft from the speakers...just moved them closer recently.
Yes I have an SPL which I rarely use since I converted my Surround sound to PURE STEREO.
Joined: Aug 29, 2002
From: Portland, Oregon - USA
Posted: 2007-10-29 00:19
On 2007-10-28 23:00, tcgalo wrote: Yes I have an SPL which I rarely use since I converted my Surround sound to PURE STEREO. Thanks guys for the input
TC- I can hear what you are saying about converting to PURE STEREO all the way over here near the west coast!
There is one other meter you might find useful though if you ever decide to dust off your SPL Meter from the maker of some great Stereo Power Amps and that is the Crown Audio Calculator which not only makes the standard calculations, but can also be used to calculate the power required for various amounts of desired headroom or the headroom that will result from using specific amounts of power.
From Crown Audio:
This calculator provides the required electrical power (power output from the amplifier) to produce a desired Sound Pressure Level (SPL) at a given distance, along with an amount of headroom to keep the amplifier(s) out of clip.
Equations used to calculate the data:
dBW = Lreq - Lsens + 20 * Log (D2/Dref) + HR
W = 10 to the power of (dBW / 10)
Lreq = required SPL at listener
Lsens = loudspeaker sensitivity (1W/1M)
D2 = loudspeaker-to-listener distance
Dref = reference distance
HR = desired amplifier headroom
dBW = ratio of power referenced to 1 watt
W = power required
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