kevemaher
Responses from kevemaher
| Phono Cartridge IMD Measurements, Observations and a Question @atmasphere I've read the Hagerman write-up and understand it. How does this relate to the IMD test I'm reporting on? The sideband peaks at 4KHz are from the 60Hz component. How does RF cause these peaks? How do I test whether my phono stages are... | |
| Phono Cartridge IMD Measurements, Observations and a Question @atmasphere Thanks for the insight. My system (up to and including the preamp): Cartridge (901 mik III or Hana ML), Micro Seiki MA-505L tonearm on a pod, Technics SL-1200G table, A/B switch, SUT, Parasound Zphono XRM phono preamp , Levinson no 3... | |
| Phono Cartridge IMD Measurements, Observations and a Question I've done some more measurements. I created an CD IMD test file and played it via my Oppo player through to the preamp out. There is no measurable IMD (probably below the noise floor) except at max gain where the preamp is overloaded. So there's ... | |
| Phono Cartridge IMD Measurements, Observations and a Question @lewm I'm measuring stereo. Left and right chs for each cartridge have the same IMD. Azimuth was optimzed prior to the measurements. I've not swapped cartridges.. | |
| What Power Amplifier Should I Buy? @lynn_olson I've dragged my Levinson no 27 Power Amp out of storage. It is now 30+ years old. I have had it for 20 years. A few months ago, I replaced all the big power supply caps (8 of 'em) with brand new ones and thoroughly cleaned it up. I b... | |
| What Power Amplifier Should I Buy? @lynn_olson I forget if I had posted previously that I am running a single 15" HSU sub right now, 800W plate amp. I xover at 120 Hz using a K231 from Sublime Acoustic. The two channels are combined in the sub.That value is higher than most recom... | |
| What Power Amplifier Should I Buy? @lynn_olson I will probably buy the Buckeye Hypex NC502MP 2-Channel amp. Spec is 500W in to 4 ohms at 1% THD. I'm not happy with that way of specifying, but the power should be far more than the Bryston and should allow me to discover what more ... | |
| What Power Amplifier Should I Buy? @lynn_olson @atmasphere I've enjoyed this discussion. I have built my own full range speakers in the past. I understand how difficult a task it is. I can get one of the Hypex modules and check it out. Past that I really can't afford even one... | |
| What Power Amplifier Should I Buy? @lynn_olson Thanks for the recommendation. Gee, those are some expensive speakers. My budget is $5K. I need to stay near that price. What is your opinion of the Revel f208 speakers? I bought them mostly because I liked the small bookshelf spea... | |
| What Power Amplifier Should I Buy? @lynn_olson @atmasphere My thanks to both of you. I agree with all that was said. I agree my speakers are mostly 4 ohms. My previous measurement indicated that even for the 4 ohm load, the voltage I measured at the speaker input terminals (pin... | |
| What Power Amplifier Should I Buy? @erik_squires Thanks for the suggestions. I use REW to characterize and help me improve my sound system. I have extensive traps from a company called "Real Traps". I know where the resonances are. I understand that dips in FR are hard to compen... | |
| What Power Amplifier Should I Buy? @lynn_olson I agree that another sub would help. I'm confused by your statement about power requirements. Did you mean to say that any amp over 100 W will push the drivers into compression (does this mean non-linear?). Therefore any amp over 1... | |
| What Power Amplifier Should I Buy? @erik_squires Moving the EQ to the sub path is a good idea. I do however, make adjustments to frequencies higher than the 120 Hz I now use as XO. What kind of measurements are you referring to? | |
| What Power Amplifier Should I Buy? @kennyc Just looked at Bryston's published spec. It is rated at 180 W into 4 ohms. So it is rated at 4 ohms. However, I was cautioned that if the impedance was below 4 ohms for a large part of the spectrum, especially in the midrange, there coul... | |
| What Power Amplifier Should I Buy? @kennyc Thanks for reminding me about this. I've seen the impedance plot on ASR. There is a dip to 3.7 ohms at about 100 Hz and 3 KHz. I also measured the voltage into the speakers while I had the SPL at the listening position using pink noise.... |