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Three very different amps. Which to choose?
- Thread starter wscottdo
- Start date
That's proof?
A Revel F208 utilizes 2 pieces of SB23NBACS45-8, which have 60W rated power handling per unit, so 120W in total. I don't think you will ever need a multi-hundred Watt monster amp for this speaker.
I can be wrong of course.
I can be wrong of course.
Id pick the Apollo, the purifi amps are fantastic thd and the peak and continuous power are more than the rest. At the end of the day you want power from your amp. Especially if you are driving a full range speaker. You will hear a big difference in the low end with the extra power the Apollon provides.
Being a 3-way the power handling is better than a 2-way and more power is required for the crossover and drivers as well the efficiency is not high on this model.
The combination of 5 ohms <Z> and –50° at 25Hz means that the F208 will need to be driven by a good 4 ohm-rated amplifier. As Erick Lichte noted, the speaker worked better from his tube amplifier's 4 ohm than from its 8 ohm output.
F208 | 3-Way Floorstanding Tower Loudspeaker
Performa3 floorstanding loudspeakers are true full-range loudspeakers with small footprints and sleek design. They deliver an impressive combination of wide frequency range, uncompressed dynamic range, and low distortion across the entire audible spectrum.
www.revelspeakers.com
Revel Performa3 F208 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the Revel Performa3 F208's frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. The F208 is a large, bulky speaker, so it wasn't possible for me to raise it...
www.stereophile.com
| Low Frequency Extension | -10dB@23Hz, -6dB@27 Hz, -3dB@31Hz |
|---|---|
| Low-frequency Driver Components | Dual 8” (20 cm) Aluminum Cone, Cast-frame Woofers |
| Mid-frequency Driver Components | 5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange |
| Recommended Amplifier Power | 50-350 Watts RMS |
| Sensitivity | 88.5dB |
Proof of that? Say, against a similar low-noise power amp but just as much power as the speaker can handle safely.
Okay, the passive filtering burns some electrical energy, but the low-frequency (where the most music power lies) drivers in the speaker still rated at 60W per unit.Being a 3-way the power handling is better than a 2-way and more power is required for the crossover and drivers as well the efficiency is not high on this model.
The combination of 5 ohms <Z> and –50° at 25Hz means that the F208 will need to be driven by a good 4 ohm-rated amplifier. As Erick Lichte noted, the speaker worked better from his tube amplifier's 4 ohm than from its 8 ohm output.
F208 | 3-Way Floorstanding Tower Loudspeaker
Performa3 floorstanding loudspeakers are true full-range loudspeakers with small footprints and sleek design. They deliver an impressive combination of wide frequency range, uncompressed dynamic range, and low distortion across the entire audible spectrum.Revel Performa3 F208 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the Revel Performa3 F208's frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. The F208 is a large, bulky speaker, so it wasn't possible for me to raise it...
Low Frequency Extension -10dB@23Hz, -6dB@27 Hz, -3dB@31Hz Low-frequency Driver Components Dual 8” (20 cm) Aluminum Cone, Cast-frame Woofers Mid-frequency Driver Components 5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange Recommended Amplifier Power 50-350 Watts RMS Sensitivity 88.5dB
Doesn't the improved power output linearity of a low Z output amp improve everything bass included?
How ~much energy does the crossover burn up? This is something that I have not approached.
Come on guys, please understand, the woofers of the F208 have a combined rated power handling of 120W per speaker. If an amp can deliver this power without too much distortion, the sound doesn't improve if more amp power is available. But even with 120W (or less) from the amp, this speaker would distort and compress significantly I guess.
Why would Revel rate the power amp requirement as 50-350 Watts RMS<?>
Because some amps are false specced?
More amp power usually don't hurts if not pushed to the speakers, just makes your wallet lighter.
I would be curious what this speaker would do if 350 real, low frequency Watts would come from the amp.
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350 real low RMS Watts would eject the woofers I think.
Exactly. And I guess the frequency doesn't even need to be lower than the vent tuning frequency for that.
If Apollon Audio, my choice of amp for the F208 would be an NC122MP or a not much more expensive NC252MP. Or for even lower noise (not for its power) the NCx500ST. But the F208 is not a high sensitivity speaker, so the lower tier Hypex amps would be sufficient noise-wise I think.
DanielT
Master Contributor
This one, or two of these, should do the job, so to speak:Being a 3-way the power handling is better than a 2-way and more power is required for the crossover and drivers as well the efficiency is not high on this model.
The combination of 5 ohms <Z> and –50° at 25Hz means that the F208 will need to be driven by a good 4 ohm-rated amplifier. As Erick Lichte noted, the speaker worked better from his tube amplifier's 4 ohm than from its 8 ohm output.
F208 | 3-Way Floorstanding Tower Loudspeaker
Performa3 floorstanding loudspeakers are true full-range loudspeakers with small footprints and sleek design. They deliver an impressive combination of wide frequency range, uncompressed dynamic range, and low distortion across the entire audible spectrum.Revel Performa3 F208 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the Revel Performa3 F208's frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. The F208 is a large, bulky speaker, so it wasn't possible for me to raise it...
Low Frequency Extension -10dB@23Hz, -6dB@27 Hz, -3dB@31Hz Low-frequency Driver Components Dual 8” (20 cm) Aluminum Cone, Cast-frame Woofers Mid-frequency Driver Components 5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange Recommended Amplifier Power 50-350 Watts RMS Sensitivity 88.5dB
Amir: Amazing that this little amplifier can handle even 2 ohm load! Note that these are short term power ratings.
Fosi Audio: The V3 Mono is our first amp with PFFB implementation. During the period we sent the set to Amir for testing, our R&D team did not stop optimizing the V3 Mono, and we have now further improved its frequency response curve. Below is the chart for your reference.:
Fosi Audio V3 Mono Amplifier Review
This is a review and detailed measurements of the Fosi Audio V3 Mono class D amplifier. It was sent to me by the company. The price with the power supply I tested is US $139.99. I must say the concept of a "monoblock" amplifier in such a small size runs foul of any expectation a longtime...
audiosciencereview.com
Edit:
So you have money to spare compared to other amps suggested in this thread. Money that can then be used o buy a better listening armchair, (or partially finance one), or a better thick carpet to put in front of the speakers, maybe vinyl records (if that's your thing) and so on.
Okay, if vinyl records are used and switched with streamed music, maybe an integrated amp with two inputs, one of which is phono, might be a better choice, but still.
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Being a 3-way the power handling is better than a 2-way and more power is required for the crossover and drivers as well the efficiency is not high on this model.
The combination of 5 ohms <Z> and –50° at 25Hz means that the F208 will need to be driven by a good 4 ohm-rated amplifier. As Erick Lichte noted, the speaker worked better from his tube amplifier's 4 ohm than from its 8 ohm output.
F208 | 3-Way Floorstanding Tower Loudspeaker
Performa3 floorstanding loudspeakers are true full-range loudspeakers with small footprints and sleek design. They deliver an impressive combination of wide frequency range, uncompressed dynamic range, and low distortion across the entire audible spectrum.Revel Performa3 F208 loudspeaker Measurements
Sidebar 3: Measurements I used DRA Labs' MLSSA system and a calibrated DPA 4006 microphone to measure the Revel Performa3 F208's frequency response in the farfield, and an Earthworks QTC-40 for the nearfield responses. The F208 is a large, bulky speaker, so it wasn't possible for me to raise it...
Low Frequency Extension -10dB@23Hz, -6dB@27 Hz, -3dB@31Hz Low-frequency Driver Components Dual 8” (20 cm) Aluminum Cone, Cast-frame Woofers Mid-frequency Driver Components 5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange Recommended Amplifier Power 50-350 Watts RMS Sensitivity 88.5dB
The Fosi amp has more power at higher phase angles
Very good point.The Fosi amp has more power at higher phase angles
