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#1
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How much amplifier power do you really need?
First a brief mention that I got my ass chewed out big time and scolded by the Harbeth user group for driving my 30.2's with a tube amp... I guess the Brits have a different philosophy on the "outdated" and "inferior" tube amplification that inevitably must take me off the path of the envisioned performance of the designer. The typical high output impedance, the low power, the distortion, the amplifier to speaker impedance interaction, blah, blah, blah all came into play in the discussions. There was no way I was going to even attempt to fight against that tide!
Of course my comments about my listening habits in the 82-85dB range with peaks rarely hitting 92dB for 95% of my listening to Jazz and Blues landed on deaf ears... Harbeth owner forum is a very passionate group, dedicated to getting the most out of their beloved speakers and I can appreciate that. So how much "amplifier" does one need? The following is an interesting video with Alan Shaw participating with the experiment with the 40.2. Of course there is no argument that if one listens to a wide variety of music with great dynamic range and at realistic levels that probably threatens the health of the eardrums, the more the better! I can't argue that point. Today as an experiment I played some Pink Floyd and Eagles at levels just over 101dB on peaks which is WAY louder than I ever listen and I of course switched to Ultra-Linear mode to get the PrimaLuna up to 70W. It was rocking no problem! No audible distortion, I could not hear any clipping and I was only about 12 o'clock on the volume pot from the normal 9-10 position. I sit about 10 ft from the speakers and they are 10ft apart in a 26x31 room. In this video are the Harbeth 40.2 not my 30.2 Harbeth 40.2 are rated to handle 600w but obviously handle peaks much greater than that. Watch the video, let's discuss. https://youtu.be/bRMR9JZ1m0s Last edited by PHC1; 02-12-2018 at 11:49 PM. |
#2
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I will field this question, the answer is More. Always more!
Sorry, I couldn't help myself. |
#3
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It seems to me the meters in the video were defective
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#4
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So ... the meters on my MC-601's never go over the 60W mark and usually live around the 6w mark and that is plenty loud for me ... I think I've convinced myself that the meters are so slow they can't possibly register the actual output of the amp so I evidently need to upgrade!
George |
#5
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Quote:
I used the exact same excuse to persuade myself to upgrade |
#6
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What many tend to ignore is the simple physics of SPL to Power. The exponential need for more power as the SPL/distance/increase.
Taking my case and breaking it down. 85dB/1W/1M speaker efficiency. 10ft listening position. 85dB SPL level Requires 5W But... Every 3dB of SPL increase, the power needs to DOUBLE. Of course if I want to listen at 94dB I would need 40 Watts and if I wanted to hit the peaks of 100dB, I would need 147 watts which will simply never happen... So obviously the iPhone SPL meter is not accurate! I need to pull out my Radio Shack SPL meter and double check tomorrow. It was probably 97dB not 101 on peaks as that would be more logical. The PrimaLuna does not put out more than 70W in Ultra-Linear with the EL34 tubes. Here is the calculator. http://myhometheater.homestead.com/splcalculator.html Last edited by PHC1; 02-13-2018 at 12:24 AM. |
#7
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Quote:
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#8
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My general rule of thumb is to use an amp having at least double the power of the speakers rating.
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Ivan FLORIDA MX136, MC1.2KW(10) MC2KW(2), MCD1100, MS750(2) MVP881, C1000C/P/T, MPC1500, HT-2 SUBS(2) HT3F(2) WS350(2) XRT2K, XCS2K, XR27(2) XCS350(2) JL GOTHAM v2 SUBS(2) SILENZIO MUSIC SERVER, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" MOTORIZED SCREEN, CINEMA-TECH SEATING, WW PLATINUM CABLES Reference System: ACCUPHASE A300 AMPS, C3900 PRE-AMP, DP1000 CD/SACD TRANSPORT, DC1000 DIGITAL PROCESSOR, DG-68 DIGITAL EQUALIZER, T1200 FM STEREO TUNER, PS1230 POWER SUPPLY, HRS-SXR CUSTOM RACK w/ M3X SHELVES, TAD REFERENCE ONE MK2 LOUDSPEAKERS, WW PLATINUM CABLES CAPE COD MX150, MC501(2) MC1.2KW(10) MC2301(2) MR88, MVP881, MCD1100, MDA1000, C1000C/P/T, MPC1500, ESOTERIC K-01X 30th ANNIVERSARY (BLACK) SACD/CD PLAYER, G02-X CLOCK, HT3F(2) XRT2K, XCS2K, XR27(2) JL GOTHAM v2 SUBS(2) JL FATHOM F113v2 SUBS(4) SOUND ANCHOR STANDS(2) KALEIDESCAPE STRATO & TERRA SERVERS 80-TB, LUMAGEN RADIANCE SCALER, SONY VPH-G90U 4K PROJECTOR, STEWART 120" SCREEN, SONUS FABER STRADIVARI, SILENZIO MUSIC SERVER, FORTRESS SEATING, WW PLATINUM CABLES Analog Rig: CLEARAUDIO INNOVATION WOOD, UNIVERSAL ARM w/ Da VINCI' CART, 2nd UNIVERSAL ARM w/ GOLDFINGER STATEMENT CART, HRS-MXR REFERENCE RACK-GLOSS BLACK w/ M3X SHELVES, AESTHETIX RHEA SIG PHONO-PRE, BRYSTON BHA-1 HEADPHONE AMP, WW PLATINUM CABLES Reference System: BURMESTER 911MK3 AMP(3), 088 PRE-AMP, 089 CD PLAYER, 100 PHONO PRE-AMP, 948 POWER CONDITIONER, ACCUPHASE DG-68 VOICING EQUALIZER, AVID ACUTUS REFERENCE SP TT, GRAHAM PHANTOM II SUPREME ARM, BENZ MICRO LP-S CART, GRANDIOSO P1X/D1X STACK, G1X RUBIDIUM MASTER CLOCK, N05 NETWORK PLAYER, SILENZIO MUSIC SERVER, HRS-SXR CUSTOM RACK w/ M3X SHELVES, SONUS FABER AIDA SPEAKERS, JL FATHOM F113v2 SUBS(2) SOUND ANCHOR STANDS(2) WW PLATINUM CABLES Library System: GRANDIOSO M1 MONOBLOCK AMPS, C1 LINESTAGE PRE-AMP, K1X CD/SACD PLAYER, G1 MASTER RUBIDIUM CLOCK, E02 PHONO-PRE, SILENZIO MUSIC SERVER, AERIAL ACOUSTICS 20T V2, AERIAL SW12 SUBS(2), CANTON REF K1’s, VPI HRX TT w/ SDS POWER SUPPLY, ORTOFON CADENZA BLACK CART, KLAUDIO RCM, SHUNYATA DENALI 6000/S v2, SHUNYATA OMEGA QR’s, WW PLATINUM CABLES Esoteric/Bryston System: ESOTERIC C02-X PRE-AMP, P-02X TRANSPORT, D02-X DAC, G02-X CLOCK, BRYSTON 28B3 CUBED MONOBLOCK AMPS(4), BRYSTON BHA-1 HEADPHONE AMP, SHUNYATA DENALI 6000/S v2(2) EVEREST 8000 POWER CONDITIONER(2) ALTAIRA CG & SG HUBS, AMR-DP777-SE DAC, SILENZIO MUSIC SERVER, TAD REFERENCE ONE MK2 LOUDSPEAKERS, QUADRASPIRE RACK, WW PLATINUM CABLES Accuphase/Canton System: ACCUPHASE E800 INTEGRATED, DP570 CD/SACD PLAYER, T1200 FM STEREO TUNER, DG-68 VOICING EQUALIZER, PS530 POWER SUPPLY, CANTON REF K3’s, CANTON REF K5’s, SILENZIO MUSIC SERVER, HRS MXR REFERENCE MAHOGHANY RACK w/ M3X2 SHELVES, WW GOLD CABLES |
#9
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Serge
Since the owners group didn't like tubes what did they recommend? The likes of Sugden, Exposure, Naim, etc.
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Jack |
#10
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"There is something about the discussion of fancy amplification which generates a burst of testosterone. Personally, I'm as interested in audio amplifiers as in lumps of coal. They both do a job of energy conversion, and that's it. As it's possible to grade amplifiers in the lab for their in/out performance in a few minutes, and there is a huge range of choice for the consumer, shortlisting a few neutral amps is a technically trivial matter. Trivial or not, it is not done, because the thrill of the love affair with the amplifier is all consuming. I appreciate the psychology of amps, but there is no space for it in my life." Perhaps he has a point but we still love our amplifiers! Last edited by PHC1; 02-13-2018 at 12:17 AM. |
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