• WANTED: Happy members who like to discuss audio and other topics related to our interest. Desire to learn and share knowledge of science required. There are many reviews of audio hardware and expert members to help answer your questions. Click here to have your audio equipment measured for free!

Three very different amps. Which to choose?

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
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.
 

Beershaun

Major Contributor
Forum Donor
Joined
Oct 3, 2019
Messages
1,894
Likes
1,936
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.
 

Doodski

Grand Contributor
Forum Donor
Joined
Dec 9, 2019
Messages
22,057
Likes
22,317
Location
Canada
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.
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.
Low Frequency Extension-10dB@23Hz, -6dB@27 Hz, -3dB@31Hz
Low-frequency Driver ComponentsDual 8” (20 cm) Aluminum Cone, Cast-frame Woofers
Mid-frequency Driver Components5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange
Recommended Amplifier Power50-350 Watts RMS
Sensitivity88.5dB
 

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
You will hear a big difference in the low end with the extra power the Apollon provides
Proof of that? Say, against a similar low-noise power amp but just as much power as the speaker can handle safely.
 

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
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.
Low Frequency Extension-10dB@23Hz, -6dB@27 Hz, -3dB@31Hz
Low-frequency Driver ComponentsDual 8” (20 cm) Aluminum Cone, Cast-frame Woofers
Mid-frequency Driver Components5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange
Recommended Amplifier Power50-350 Watts RMS
Sensitivity88.5dB
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.
 

Doodski

Grand Contributor
Forum Donor
Joined
Dec 9, 2019
Messages
22,057
Likes
22,317
Location
Canada
Proof of that? Say, against a similar low-noise power amp but just as much power as the speaker can handle safely.
Doesn't the improved power output linearity of a low Z output amp improve everything bass included?
 

Doodski

Grand Contributor
Forum Donor
Joined
Dec 9, 2019
Messages
22,057
Likes
22,317
Location
Canada
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.
How ~much energy does the crossover burn up? This is something that I have not approached.
 

Beershaun

Major Contributor
Forum Donor
Joined
Oct 3, 2019
Messages
1,894
Likes
1,936
Proof of that? Say, against a similar low-noise power amp but just as much power as the speaker can handle safely.
Ok. One more time...
 

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
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.
 

Doodski

Grand Contributor
Forum Donor
Joined
Dec 9, 2019
Messages
22,057
Likes
22,317
Location
Canada
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. Even with 120W (or less) from the amp, this speaker would distort and compress significantly.
Why would Revel rate the power amp requirement as 50-350 Watts RMS<?>
 

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
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.
 
Last edited:

Doodski

Grand Contributor
Forum Donor
Joined
Dec 9, 2019
Messages
22,057
Likes
22,317
Location
Canada
Because some amp 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.
350 real low RMS Watts would eject the woofers I think.
 

YSDR

Senior Member
Joined
Sep 5, 2019
Messages
304
Likes
313
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

Major Contributor
Joined
Oct 10, 2020
Messages
4,914
Likes
4,902
Location
Sweden - Слава Україні
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.
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.
Low Frequency Extension-10dB@23Hz, -6dB@27 Hz, -3dB@31Hz
Low-frequency Driver ComponentsDual 8” (20 cm) Aluminum Cone, Cast-frame Woofers
Mid-frequency Driver Components5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange
Recommended Amplifier Power50-350 Watts RMS
Sensitivity88.5dB
This one, or two of these, should do the job, so to speak:
Fosi Audio Mono V3 amplifier power 4 ohm measurement.png




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.:

IMG_5594 (1).PNG


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.
 
Last edited:

wwenze

Major Contributor
Joined
May 22, 2018
Messages
1,407
Likes
1,976
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.
Low Frequency Extension-10dB@23Hz, -6dB@27 Hz, -3dB@31Hz
Low-frequency Driver ComponentsDual 8” (20 cm) Aluminum Cone, Cast-frame Woofers
Mid-frequency Driver Components5.25” (13.3 cm) Aluminum Cone, Cast-frame Midrange
Recommended Amplifier Power50-350 Watts RMS
Sensitivity88.5dB

The Fosi amp has more power at higher phase angles

index.php
 
Top Bottom