JefDC
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Posts posted by JefDC
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15 minutes ago, Klipschtastic said:
My RF3s are really good but my KLF20s are a step up. I’d recommend those if you can find them. But then again if you really like your RF3s, buying a newer version of those isn’t a bad way to go.
The 'if I can find them' is key here, the same applies for all the older types. I live in Europe so the options are even more limited.
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42 minutes ago, Oniiz86 said:
The RF-82s (Ref IV) were actually 2000Hz & the RF-82 IIs (Ref V) were 1400Hz
Correct, I have edited it in the original text.
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Thank you for the reply and the (for me) interesting picture with the size difference.
I'm afraid RF-7's will be too big.
The RF-82's are interesting, I will try to find some to audition.
What type of woofers did you install in the RF-3's ?
Something that surprises me is the radical different cross-over frequencies in the speakers:
RF-3 : 1975 Hz
RF-5 : 2500 Hz
RF-35 : 2600 Hz
RF-82 II : 1400 Hz
RF-7 : 2200 Hz
RF-7 III: 1300 Hz
I imagine that must have a considerable impact on the sound.
Best regards ... Jef
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Hello,
Last week I was able to listen to my 20 year old RF-3's again and I really like their sound but they are visually beaten up.
I have presently RP-8060 FA's but they sound too refined, the RF-3's give me goosebumps the RP-8060's don't.
What would be a good replacement for the RF-3's that have a similar dynamic sound signature ?
Would Heresy's or Forte's be a good choice ? Or do I have to look to second hand RF-3's or RF-5's in good condition ?
Best regards ... Jef
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45 minutes ago, Flevoman said:
They are sitting in there own corner now 😉
Eating all those delicious low and some mid frequencies 😁
You can actually check this, play some loud music and touch the cones of the not-playing speakers and feel them vbrate. Some of the vibration is absorbed and others re-emitted.
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On 6/11/2023 at 6:40 PM, Flevoman said:
Just a small update:
......
The cool thing is that I can compare the CW4 vs the lascala AL-5 side by side in my own livingroom.
In the end one pair of speakers will leave, but for now I just enjoy the situation to be able to compare both speakers 😁
Hello,
as you are listening very critically I hope you are aware that speakers close together will influence each other.
Some frequencies are absorbed, depending on the size of the speaker - a kind of a 'bass trap'.
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21 hours ago, MicroMara said:
I´m not your math teacher 😂 I´m just a silly german guy ..and I don´t know wether you´ll understand this 🤔
The general formula of electric power is
The following formulas apply to ohmic resistors in a DC circuit:
What is the unit of electric power? The unit of electrical power is watts:
What does electrical power say? The electrical power makes a statement about how much electrical energy per time an energy converter ("consumtion") converts into other forms of energy.
The greater the power, the more energy is converted or transformed in a shorter time.
Got it 🤣
No need to be condescending.
When the resistance halves the power should double (using the formulas you quoted: P= U.I etc etc)
Not all amplifiers are able to do this, those that can will advertise this clearly in the Specifications of their amplifier.
As an example:
Got it ?
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On 4/17/2023 at 10:33 PM, MicroMara said:
The RB-1582 MK II has 200W/8Ohm per channel, purely mathematically that should be about 275 watts at 4 ohms.
What are the mathematics to arrive at 275 watts at 4 Ohm ?
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I had the RF-3's and R-26FA's.
The RF-3's where much better in all respects.
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Off course.
My RP8060FA's are put in the corner, for music I plug them for HT no plug.
You won't damage the speakers, you change the frequency response; with a plug there is less bass volume but the frequency response goes a little bit deeper (I don' use a sub).
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Part 5 en 6
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Part 3 and 4
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An article on the Tractrix horn by Roy Delgado, Kerry Geist and Jim Hunter
Part 1 and 2
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In France you can buy them (occasionally) new for 300€, normally 450€ - so 300$ seems OK.
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It is absolutely beautiful.
There is no need to change IMO, but an idea 😈 would be to give every wire its own hole (except the diodes if you decide keep them after the remarks above) that way all the wires exit perpendicular from their source like the capacitors
But again, it is absolutely beautiful.
Best regards ... jef
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Experiment with different (higher) cross-over frequencies.
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Exact the info I needed, thanks !!!
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Hello,
I'm looking at a set of second hand Palladium P-17B's, these speakers have a mid range horn with a passband of (500Hz) 600hz - 3.4kHz
This is even lower than the midrange horn of a Heresy (850Hz - 5000Hz)
Is the Palladium midrange sound comparable to the Heresy ?
Thanks ... Jef
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In that case, get rid of the expensive ones and allow your ear and associated psycho acoustics to get used to the speakers you own.
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On 6/9/2021 at 11:38 PM, Bubo said:
Where is here ?
Belgium
But that price is representative for a large part of Europe.
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2 hours ago, Bubo said:
Where is here ?
Belgium, but that price is representative for a large part of Europe.
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5 hours ago, Bubo said:
Filled up my car yesterday
Regular up from $2 now $3.45
Hi test aka super now at $4 Gal
Fuel cost effects every other price, since everything requires transport inc workers.
Inflation is just begining
Like a snowball rolling down hill, it will gather size and strength
Premium here is $7.37 per American Gallon (3.785 liters)
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Hello,
Are you sure? All my sources connected to Netflix allow to select a stereo stream in the Netlix app itself, you can find it where the different languages are available.
Hope this helps.
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Chris,
if I read your graph correctly you measured with a sound volume of 100dB but the distance is not mentioned. As the sensitivity of the Jubilee is around 105db it is reasonable to assume your input power was around 1 Watt maybe a little more.
If one is to inject a sine wave of 12Vrms to measure the THD over the frequency range of the R-51M speaker this corresponds to an input power between 18 and 36 Watts (8 to 4 ohm) I'm quite sure that poor tweeter will have a short life in the course of that test. 🙂
RF-3 replacement
in 2-Channel Home Audio
Posted
I wonder about the RF-62 and RF-62 II as they are almost the same physical size as the RF-3's and I could buy a RF-62 II
The Bandwidth and Sensitivity specs are comparable as well:
RF-3 Bandwidth: 37Hz–20kHz±3dB Sensitivity: 98dB @ 1 watt / 1 meter
RF-62 II Bandwidth: 35Hz-24KHz ± 3dB Sensitivity: 97dB @ 2.83V / 1m
But here again a considerable difference in cross-over frequency:
RF-62 : 1800 Hz
RF-62 II : 1500 Hz
and I can't imagine what difference that makes.