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#1
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Integrated amp for Dynaudio BM15 passives?
Hi,
Until recently I thought there is no way that I can find something for a decent price (not costing 1000s), but (hurray hurray) I found two contenders, and I would really appreciate your thoughs on those pieces, it's Onkyo and Yamaha integrated amps, which don't need pre- amps. My biggest concern is that Yamaha states it's a 8ohm-6 ohm amplifier, though they rate the dynamic power at 8/6/4/2 ohms, and DIN power at 250W (4ohms) 1 KHz. their specification goes like this (BTW, yamaha is an old amplifier, from 90's, so any info on it would be greately appreciated, because I cannot find anything, including the differences between AX-1050, AX-1070 and AX-1090 amps, the specs of which look absolutely identical): Yamaha AX-1090 Minimum RMS power per channel 8 ohms, 20hz to 20 khz 0.01 THD - 145W 6 ohms, 20hz to 20 khz 0.02 THD - 185W Dynamic power per channel 8/6/4/2 ohms - 220 / 290 / 360 / 460W DIN standart output power per channel (europe model only) 4 ohms, 1khz 0.7 thd - 250W Dynamic headroom 8/6 ohms - 1.81 db / 1.95 db IEC power (8 ohms, 1 khz 0.01 THD (europe model only) 170W Power band width 8 ohms, 72.5W 0.03 THD Damping factor 8 ohms 20 hz to 20 khz 350 or more The other contender is an Onkyo A-9755, which is a bit on the pricey side for me. Note the low damping factor, which might be a bit of a problem, is it not? Plus it doesn't have a pre-out, which is weird. Does this mean I would not be able to connect a subwoofer to it? Power output: 150 W + 150 W (8 Ù, 1 kHz, DIN) 300 W + 300 W (4 Ù, 1 kHz, JEITA) Dynamic power: 330 W + 330 W (3 Ù, Front) 270 W + 270 W (4 Ù, Front) 170 W + 170W (8 Ù, Front) THD (total harmonic distortion): 0.08 % (1 kHz, 1 W) Damping factor: 25 (Front, 1 kHz, 8 Ù) Input sensitivity and impedance: 200 mV, 50 kÙ (CD) 2.5 mV, 50 kÙ (PHONO MM) Output level and impedance: 200 mV, 2.2 kÙ (REC OUT) Phono overload: 70 mV (MM, 1 kHz, 0.5 %) Frequency response: 10 Hz-60 kHz, +1 dB-3 dB (CD) Tone control: +10 dB, -10 dB, 100 Hz (BASS) +10 dB, -10 dB, 20 kHz (TREBLE) +10 dB, 50 Hz (LOUDNESS) +2 dB, 10 kHz (LOUDNESS) SN ratio: 100 dB (CD, IHF-A) 70 dB (PHONO, IHF-A) Speaker impedance: 4-16 Ù These are my speakers: Dynaudio BM15 passives: Frequency Response (+/- 3 dB) 43 Hz - 20 kHz Peak SPL 1m, pair (IEC Long Term) 127 dB Peak Peak SPL 2m, 5.1 (IEC Long Term) 128,5 dB Peak Max SPL 1m SPL @ 1m (+4/-10) 109 dB RMS Amplifier Minimum 50 W ( 94 dB SPL @ 2m) IEC Long term powerhandling 250W IEC Short term powerhandling 1000W Sensitivity 88 dB Impedance Nominal 4 ohm Impedance HF (200 kHz) 5,9 ohm Resonance Frequency 43 Hz Internal Cabinet Volume 25,8 liters Bass Principle Bass reflex Crossover Frequencies 2700 Hz Crossover Slope Woofer 6 dB/oct; Tweeter 12 dB/oct I know that Onkyo is rated at 4 ohms, so it's more fitting to my speakers, but as I said it's a bit on the pricey side, plus it wouldn't hurt to understand (for me) is there any difference in those specs (except for the obvious power difference in wattage). Which one of these would fit my speakers better? Thanks so much in advance! Ray |
#2
Posted to rec.audio.pro
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Integrated amp for Dynaudio BM15 passives?
On Dec 5, 5:58 am, wrote:
Hi, Until recently I thought there is no way that I can find something for a decent price (not costing 1000s), but (hurray hurray) I found two contenders, and I would really appreciate your thoughs on those pieces, it's Onkyo and Yamaha integrated amps, which don't need pre- amps. My biggest concern is that Yamaha states it's a 8ohm-6 ohm amplifier, though they rate the dynamic power at 8/6/4/2 ohms, and DIN power at 250W (4ohms) 1 KHz. their specification goes like this (BTW, yamaha is an old amplifier, from 90's, so any info on it would be greately appreciated, because I cannot find anything, including the differences between AX-1050, AX-1070 and AX-1090 amps, the specs of which look absolutely identical): Yamaha AX-1090 Minimum RMS power per channel 8 ohms, 20hz to 20 khz 0.01 THD - 145W 6 ohms, 20hz to 20 khz 0.02 THD - 185W Dynamic power per channel 8/6/4/2 ohms - 220 / 290 / 360 / 460W DIN standart output power per channel (europe model only) 4 ohms, 1khz 0.7 thd - 250W Dynamic headroom 8/6 ohms - 1.81 db / 1.95 db IEC power (8 ohms, 1 khz 0.01 THD (europe model only) 170W Power band width 8 ohms, 72.5W 0.03 THD Damping factor 8 ohms 20 hz to 20 khz 350 or more The other contender is an Onkyo A-9755, which is a bit on the pricey side for me. Note the low damping factor, which might be a bit of a problem, is it not? Plus it doesn't have a pre-out, which is weird. Does this mean I would not be able to connect a subwoofer to it? Power output: 150 W + 150 W (8 Ù, 1 kHz, DIN) 300 W + 300 W (4 Ù, 1 kHz, JEITA) Dynamic power: 330 W + 330 W (3 Ù, Front) 270 W + 270 W (4 Ù, Front) 170 W + 170W (8 Ù, Front) THD (total harmonic distortion): 0.08 % (1 kHz, 1 W) Damping factor: 25 (Front, 1 kHz, 8 Ù) Input sensitivity and impedance: 200 mV, 50 kÙ (CD) 2.5 mV, 50 kÙ (PHONO MM) Output level and impedance: 200 mV, 2.2 kÙ (REC OUT) Phono overload: 70 mV (MM, 1 kHz, 0.5 %) Frequency response: 10 Hz-60 kHz, +1 dB-3 dB (CD) Tone control: +10 dB, -10 dB, 100 Hz (BASS) +10 dB, -10 dB, 20 kHz (TREBLE) +10 dB, 50 Hz (LOUDNESS) +2 dB, 10 kHz (LOUDNESS) SN ratio: 100 dB (CD, IHF-A) 70 dB (PHONO, IHF-A) Speaker impedance: 4-16 Ù These are my speakers: Dynaudio BM15 passives: Frequency Response (+/- 3 dB) 43 Hz - 20 kHz Peak SPL 1m, pair (IEC Long Term) 127 dB Peak Peak SPL 2m, 5.1 (IEC Long Term) 128,5 dB Peak Max SPL 1m SPL @ 1m (+4/-10) 109 dB RMS Amplifier Minimum 50 W ( 94 dB SPL @ 2m) IEC Long term powerhandling 250W IEC Short term powerhandling 1000W Sensitivity 88 dB Impedance Nominal 4 ohm Impedance HF (200 kHz) 5,9 ohm Resonance Frequency 43 Hz Internal Cabinet Volume 25,8 liters Bass Principle Bass reflex Crossover Frequencies 2700 Hz Crossover Slope Woofer 6 dB/oct; Tweeter 12 dB/oct I know that Onkyo is rated at 4 ohms, so it's more fitting to my speakers, but as I said it's a bit on the pricey side, plus it wouldn't hurt to understand (for me) is there any difference in those specs (except for the obvious power difference in wattage). Which one of these would fit my speakers better? Thanks so much in advance! Ray What are you using the amplifier for? Since this is a Production newsgroup i would assume that you would be using it with a mixer so you wouldn't need preamps anyway. If this for home HiFi application, buy the4 one that sounds best with your current equipment. You cannot compare sound from a spec sheet. As to the 4 ohm rating, either of the amplifiers will drive 4 ohm speakers safely. Unless ou are really cranking the system to high levels, either will be adequate for sound levels. |
#3
Posted to rec.audio.pro
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Integrated amp for Dynaudio BM15 passives?
Thanks, Richard! I'm just not good with all these numbers, that's why
I'm worried. I mean, if the Yamaha amplifier is suitable for 4 ohm loads, why the hell do they write RMS power in 8 ohms and 6 ohms only? Thanks again. Ray |
#4
Posted to rec.audio.pro
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Integrated amp for Dynaudio BM15 passives?
wrote:
Thanks, Richard! I'm just not good with all these numbers, that's why I'm worried. I mean, if the Yamaha amplifier is suitable for 4 ohm loads, why the hell do they write RMS power in 8 ohms and 6 ohms only? It's always a good question when hear that kind of thing... odds are it's because the power at 4 ohms is not twice more than at 8 ohms, meaning the power supply is petering out. Still, the power ratings don't really matter... the speakers are pretty efficient and you won't be using them loud. Worry about what the amps sound like instead. --scott -- "C'est un Nagra. C'est suisse, et tres, tres precis." |
#5
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Integrated amp for Dynaudio BM15 passives?
On Dec 6, 5:48 am, wrote:
Thanks, Richard! I'm just not good with all these numbers, that's why I'm worried. I mean, if the Yamaha amplifier is suitable for 4 ohm loads, why the hell do they write RMS power in 8 ohms and 6 ohms only? Thanks again. Ray Check the specs here-- It shows the AX1090 at 2 ohms. http://www.yamaha.co.jp/english/prod...hf/ax1090.html |
#6
Posted to rec.audio.pro
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Integrated amp for Dynaudio BM15 passives?
On Dec 7, 1:01*pm, Richard Kuschel wrote:
On Dec 6, 5:48 am, wrote: Thanks, Richard! I'm just not good with all these numbers, that's why I'm worried. I mean, if the Yamaha amplifier is suitable for 4 ohm loads, why the hell do they write RMS power in 8 ohms and 6 ohms only? Thanks again. Ray Check the specs here-- It shows the AX1090 at 2 ohms. http://www.yamaha.co.jp/english/prod...hf/ax1090.html And it has a "speaker impedance selector" ? rd |
#7
Posted to rec.audio.pro
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Integrated amp for Dynaudio BM15 passives?
On Sun, 7 Dec 2008 21:28:20 -0500, Charlie Olsen
wrote: And it has a "speaker impedance selector" ? This is typically a choice of taps on the power transformer's secondaries to vary supply voltages to the output stages. As for ratings, maybe the reason they didn't rate at the lower impedance is because they could not make the frequency response or distortion figures. FTC preconditioning specs were notoriously dangerous thermally, requiring long periods at high thermal loads (less than full power outputs can cause *higher* heat loading - strange but true). An honest amplifier manufacturer was typically limited more by FTC protocols than by frequency response or distortion, in modern-era amplifiers. All the best fortune, Chris Hornbeck |
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