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BI-Amping the N9000ES in BTL |
tcgalo
Rank: Sony Addict
Joined: Oct 13, 2007
Posts: 270
From: denver
 |  Posted: 2007-10-20 02:49
Question
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
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It All Depends
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maverick11359
Rank: Sony King
Joined: Dec 13, 2005
Posts: 1518
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.
Have fun !
Cheers maverick.
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Craig_Nike
Rank: Ultimate Sony Reviewer
Joined: Apr 05, 2002
Posts: 2262
From: Australia
 | Posted: 2007-10-28 03:08
 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
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This is the last thing I need for my HT - now i'm finished!
AVR: STR-DA9000ES & STR-DA5300ES
AMP: TA-N9000ES
BLU: PS3
DVD: 999ES & 777ES
SPKR: SS-X70ED, SS-XCN70ED, SS-LA500ED
SUB: SAW-X700M
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SPCOOLIN
Premium Member
Rank: Ultimate Sony Reviewer
Joined: Jan 20, 2003
Posts: 3627
From: Tampa Bay FL.
.jpg) | 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...
http://www.myhometheater.homestead.com/splcalculator.html
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...
Steve~
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 ]
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tcgalo
Rank: Sony Addict
Joined: Oct 13, 2007
Posts: 270
From: denver
| Posted: 2007-10-28 23:00
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.
Thanks guys for the input
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It All Depends
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Maxxwire
Moderator
Premium Member
Rank: Sony Adept
Joined: Aug 29, 2002
Posts: 25772
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)
Where:
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
~Maxx~
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A Satisfied Sony Fan Since 1974!
The OCCC Furu-Charged Sony DB 930
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tcgalo
Rank: Sony Addict
Joined: Oct 13, 2007
Posts: 270
From: denver
| Posted: 2007-11-01 01:41
Maxx,
Thanks for the calculator.... I am not using any power to get to my reference listening level!!!!!!!!!!!!!!!!!!!70dB
No wonder the current on the Belkin never changes when am playing music....but once in a while when am running a demagnetizing disc, the amps will usually pull over 15 amps from the wall.
I LOVE SONY
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It All Depends
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Maxxwire
Moderator
Premium Member
Rank: Sony Adept
Joined: Aug 29, 2002
Posts: 25772
From: Portland, Oregon - USA
| Posted: 2007-11-01 14:36
TC- When I use the Crown Calculator to solve for the amount of power needed to drive my 93 dB efficient speakers to a listening level of 72 dB SPL even at just 1 meter I also get 0 as a result.
Although when I figure it out myself the old fashioned way on a standard calculator I get a result of .0078 watts.
Evidently the Crown Calculator is set up so that the results are only displayed in whole integers and for fractional results of less than 1 watt it simply defaults to 0.
~Maxx~
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A Satisfied Sony Fan Since 1974!
The OCCC Furu-Charged Sony DB 930
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