atmasphere
Responses from atmasphere
| We should reject hard-to-drive speakers more often Yes, the 705s are not that hard to drive. But whether the speakers were sensitive or not was not the issue. Did I like the sound? I know two people who have Maggie's and 400 watts in each monoblock to drive them. They love them. I see no reason ... | |
| We should reject hard-to-drive speakers more often @brev I get that this was your experience which I don't argue. But the sensitivity of the speaker does matter. FWIW, if you have the standmount version of the 702, its a pretty easy speaker to drive despite being a little less sensitive. | |
| Tube amps - what 3 things… I know that cathode bias is still cathode bias with any cathode capacitor value. But the cathode to ground impedance is realy very different. On 20 Hz with standard 100uF the impedance is Z=80 Ohm, 10000uf Z=0.8 Ohm, 100000uF Z=0.08Ohms. @alexb... | |
| Tube amps - what 3 things… Cathode bias is not a good thing in input and driver stages, not just in the output stage. I tried one solution in my DIY SET 300B amp. There is 6sn7 input tube and 6F6G in triode mode driver tube with coupling capacitors between stages. The sol... | |
| We should reject hard-to-drive speakers more often @ricred1 My room is L-shaped...front wall is 20’ wide, length is 26’, rear wall is 26’ wide, and 9’ ceiling. My room is rather "neutral", not too lively and not dark. With those speakers in a room of that size I would expect you'll need about... | |
| We should reject hard-to-drive speakers more often Please suggest a couple of integrated amplifiers that can drive MBL 101e speakers. My experience is limited to the mbl 101e. It was rated at about 81 dB which you would think is crazy inefficient. Its also a 4 Ohm load, climbing to 8 Ohms in th... | |
| We should reject hard-to-drive speakers more often Interesting...I’m considering MBL 101E speakers, but I’m hesitant due to them being hard to try. @ricred1 MBLs are easier to drive than they might appear. That is because they are omnidirectional and when measured, the microphone is placed 1 me... | |
| What speakers work with low wattage class A amps Maybe I should turn the question on its head and ask: What class A amp that is between 5K and 10K or so can drive speakers like the Celestion 700se. or Harbeth 30.2. Why do you want a class A amplifier? There are class D amps available now that... | |
| Matching Power and Speakers -- Much Ado about Not-that-Much? (Tube amps and speakers) There’s also cases of speakers rated for 4 ohms which are 2 ohm speakers and they don’t need power so much as current. You tend to get higher current with bigger amps (not universally true). @erik_squires Uh, just so we’re clear: current cann... | |
| Tube amps - what 3 things… ralph, curious to know what is your take on auto biasing... now increasingly employed in high level tube amps, audio research’s newer amps for instance the feature certainly offers a major convenience factor for users, but what do you see as the... | |
| Tube amps - what 3 things… My tube amps don't care if they're running 4 ohm or 8 ohm loads, have had both, and the 4 ohm loads do not cause any issues with greater loading, heating, etc, with the tube amps I think you'll find that using a thermal imaging camera that on a... | |
| CLASS A POWER RATINGS So, if I compare, say a Pass Labs XA 30.8 (30W class A) vs a Pass Labs X260.8 (1st 34W are class A assuming 8 ohm loads) at regular listening levels on efficient speakers (so, at 1-5W power at listening levels), are they two different levels of C... | |
| Matching Power and Speakers -- Much Ado about Not-that-Much? (Tube amps and speakers) If I'm understanding the upshot of what he's saying, it's that lower-power tube amps made with quality transformers (and well made generally) have a very good shot at doing an excellent job for a much wider range of speakers than is typically ass... | |
| Tube amps - what 3 things… For example: does any manufacturer use an inductor filtered power supply instead of the much cheaper (and lighter) capacitance filtered power supply? None that I know of. @xenolith As far as I’m aware, chokes are always used in tandem with capa... | |
| CLASS A POWER RATINGS but class B operation is push/pull, not? @sngreen Class B only means that the amplifier is conducting for half of the waveform. You can build a single-ended amplifier that is class B (not that you would want to listen to it). IOW Its not an ... |