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Al.M

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About Al.M

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  1. Keep an eye out for suitable used speakers and return here for comments with models.
  2. Also, many mistakes in the way people are measuring and quoting noise figures, no weighting mentioned - should generally be in dB(A) meaning A- weighted, many cheap noise meters and mob apps don’t have dB(A) so one can only measure in dB Z or linear which can be 5-15dB higher, some only looking for the highest figure like the dB max or peak when it should be the average resulting in 10dB differences, no distance to noise source mentioned, not excluding significant background noises etc.
  3. Agreed, you need to select an accurately review noise app for the particular type of noise duty. I’ve tested the SLA app against a NATA certified noise meter as well and found it to be accurate in higher noise levels particular around the commonly quoted 85dB(A) eight hour work safety standard. Around 30dB is becomes quite inaccurate, however many other cheap noise meters are also inaccurate at those levels as well. There are also other user errors like palm covering mic, covers, obstructions and positioning. External mics can be used with mob phones with better accuracy as well.
  4. Floorstander vs mid to large bookshelf is up to you but the latter with stands occupies same floor space and floorstander choices include more potential fullrange sound from 3 way driver designs and larger cabinet volume with possible lower bass extension. Bookshelves on tv unit can be too close to wall and shelf mount doesn’t sound as good, but depends on how important it is for you. $1500 used could get you lots of better quality brands over a Canton such as Monitor Audio, B&W, Krix, Dynaudio, Focal, Spendor, Proac, Kef etc, although looks like good value.
  5. Yep, though referring back to those first two graphs the average mid aged male audiophile age 50 and 60+ hearing loss is down by about 20-40dB with mild to moderate hearing loss compared to younger, needing over twice the perceived loudness (10dBA is about twice perceived loudness) and the volume control might need to go from about 9am to 11-12 to make the difference between young and older person. So what does this mean for preamp manufacturers, are they setting best sounding product volume attenuation for those of certain age in the market where most buyers are likely to be for best sales success. Also, in the male mid age group average hearing freq response rapidly drops after 3khz going from slight at -25dB loss to moderate loss at -40dB and then over 60+ years to moderately severe at -60dB loss at 8khz. The brain tries to compensate but there is only so much it can do until it has little or no effect.
  6. As mentioned, position the right side speakers away from that wall window about at least 1.5m. An AV system isn’t usually like a 2 channel stereo system where people place emphasis of having the speakers 1m or more out into the room, instead the system cabinet against the wall along with the speakers. Speakers less than 0.5m generally don’t sound as good vs further out. With 3.7m front to rear walls there is enough space to position speakers within the recommended equilateral speaker triangle (google that) with seated position against the wall, which isn’t ideal but it can still work with window curtains all round to help. I would wait until the system is installed with all furniture, large thicker floor rug and curtains and see if it sounds OK before resorting to additional treatments as these may be enough to breakup reflections and absorbency.
  7. There’s plenty more graphs if requested by popular demand, was trying to address OP mentioning he wanted 85dB listening levels and others sayin things don’t sound good until at certain higher levels and what all that may means with the way we hear things (a fair bit out of our control).
  8. With 40 year old amps the very many circuit capacitors start to dry up, loose value and or fail eventually. A good local tech should help. Compare the sound with another amp and see if there is any difference.
  9. Ear bud listening is about 7dB louder inside the ear canal than outside so that generation is affected more. Below is a likely similar hearing comparison graph by age and noise activity exposure.
  10. And let’s not forget we can be hearing things differently depending on your age, the normal A-weighted hearing of humans and in relation to the Fletcher Munson curve discussed in other forums that humans normally perceive sound differently according to the loudness. So at higher loudness the perceived sound is flatter and low level frequencies are more discernible than at low loudness levels where the normal response of the human is less able and this affects the whole listening experience at that particular time. Several graphs below. Up around 90dB+ freq perception gets flatter but it is really too loud for extended listening comfort and hearing safety. I’m middle aged and in practice I can enjoy 60-80dB(A) levels (70-90dB Z or linear levels as most people who don’t know normal quote sound levels, where no weighting is stated).
  11. You can ask Rwaves to install a volume pot on the power amp.
  12. Would go for 12dB attenuators given your observation that 9am volume is too much. If the 12dB translates to exactly that through the circuit, which I doubt, it is subjectively twice less the perceived loudness interpreted at your hears and brain, so should give at least double the affect. Try the 6dB attenuators as well to give a half way result if you find the 12dB is too much. I have used the RCA attenuators and the sound quality effect is minisculel to non-existent in my system and ears using Supratek tube preamp.
  13. It’s the gain match between your two components as both are set high at the factory, a little rare for things to happen at 9am volume so howabout 8am. Sometimes the problem is the other way around where you need it at 1pm volume to sound normal. The RCA attenuators mentioned above would fix it. If you look into to the gain value specs of the new amp it will give an idea compared to your current amp. There would likely be two factors going significantly down to a 15w amp, one being the gain setting and the other the ten times drop in power. You may not know exactly until you connect them up, it’s likely to play a lot lower volume. 90dB efficiency speakers are about average and not make big difference but the 15w amp may struggle to drive it depending on the impedance match. The speakers are rated at 8 ohm impedance so friendly enough and most low powered amps should work, likely to need about 11-1pm volume for normal listening levels. The room size will be a factor also as the speaker needs to fill it out. Also, why do you want 85dB levels as many audio room average levels can be around 70-80dB(A) although if you are measuring at 85dB with no weighting mentioned it’s likely to be closer to what I mentioned in A-weighting which is how humans hear sound and relate closer to the dB value and your quoted figure.
  14. Better speaker cables if you are using thin cheap ones. Right speaker is too close to wall, space it out although you are locked in due to TV position. Toe speakers in towards listener. Large rug on floor for sound damping.
  15. Many mob apps quite inaccurate tested to be out by up to 9dB, which is about twice the perceived loudness, see here https://www.researchgate.net/publication/289502743_Testing_the_accuracy_of_smartphones_and_sound_level_meter_applications_for_measuring_environmental_noise
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