DanielSmi
Second Unit
- Joined
- Mar 20, 2002
- Messages
- 455
Now, I don't want anyone to yell at me but I was just looking at the specs of the B&K amps and they didn't look to fast. Yes, it's true I've never heard them before but I was wondering if this was true? I'll give some examples:
Damping Factor: 450 at 50Hz
Dynamic Headroom: 1.2dB
Slew Rate: 14v/µs.
Now I'll comare it to a similiarly priced Parasound 2205at:
Damping factor : >1000 at 20Hz
Dynamic Headroom: >1.5dB
Slew rate: 130 V/µs
Now I'll give you definitions of these terms if you don't know them so you'll understand where I'm coming from. (terms from www.audiovideo101.com)
Damping- An audio system's ability to stop playing a signal after it has ended. For instance, a sharp drum thump should not drag on for too long a time. If it does, the system is exhibiting poor damping meaning that it is not properly ending the sound production associated with the drum thump. Such a system is generally muddy and not well refined making individual musical nuances difficult to make out.
The damping factor relates to how well an amplifier is able to control the movement of a speaker driver, stopping its motion after the signal has stopped. If the driver motion is not halted, the driver will continue to move creating back-EMF (voltages sent back into the amplifier from the speaker's voice coil moving in the magnetic field) and unpleasant, distorted sounds. Look for an amplifier with a high damping factor when you go to purchase audio equipment. The damping factor should be at least 300.
Dynamic Headroom- An amplifier's ability to go beyond its rated average power for a short time in order to recreate loud or explosive audio signals that rise very quickly, without distorting or clipping. In order to have high headroom (an ability to achieve loud peak levels without distorting), and amplifier must have a solid power supply with a good amount of reserve energy on which it can call. Headroom, also referred to as dynamic headroom, is measured in decibels (dB). An amplifier with a rating of 3 dB can double its output power for peaks. Look for an amplifier with a rating of 1.5 dB or higher. It is important to have an amplifier with a strong power supply.
Slew Rate- Fastest rate at which an amplifier can change the amplitude of its output signal measured in volts per microsecond with a higher figure being better (meaning that the amplifier can change more voltage in a given period of time, one microsecond). An amplifier with a good slew rate can quickly alter the amplitude, or power/volume, of a signal. This is an important characteristic for reproducing sudden, extreme changes in a signal such as those developed with an explosion or similar loud, powerful, sudden sound. Slew rate is the response rate to an increase in amplitude.
Now notice that the damping factor for the 2 are measured at different frequencies. The Parasound at 20Hz and B&K at 50Hz. I think it's safe to assume that stopping a 20Hz signal is harder than stopping a 50Hz signal. Now the B&K doesn't have the lowest damping factor I've seen in fact it is similiar to the Rotel, but the worst I've seen was actually from a McIntosh 5 channel amp my friend has and that's at like 150 or something, it's really low. Also notice that www.AudioVideo101.com says that the dynamic headroom should be at least 1.5dB and that B&K doesn't meet that, but it does have a damping factor higher than 300.
Again I'd like to say that I've never heard these amps before, but from looking at the stats it doesn't appear to have a very powerful power supply. I also don't own a Parasound. These are just observation of stats. So, whad'ya think?
Daniel Smith
Damping Factor: 450 at 50Hz
Dynamic Headroom: 1.2dB
Slew Rate: 14v/µs.
Now I'll comare it to a similiarly priced Parasound 2205at:
Damping factor : >1000 at 20Hz
Dynamic Headroom: >1.5dB
Slew rate: 130 V/µs
Now I'll give you definitions of these terms if you don't know them so you'll understand where I'm coming from. (terms from www.audiovideo101.com)
Damping- An audio system's ability to stop playing a signal after it has ended. For instance, a sharp drum thump should not drag on for too long a time. If it does, the system is exhibiting poor damping meaning that it is not properly ending the sound production associated with the drum thump. Such a system is generally muddy and not well refined making individual musical nuances difficult to make out.
The damping factor relates to how well an amplifier is able to control the movement of a speaker driver, stopping its motion after the signal has stopped. If the driver motion is not halted, the driver will continue to move creating back-EMF (voltages sent back into the amplifier from the speaker's voice coil moving in the magnetic field) and unpleasant, distorted sounds. Look for an amplifier with a high damping factor when you go to purchase audio equipment. The damping factor should be at least 300.
Dynamic Headroom- An amplifier's ability to go beyond its rated average power for a short time in order to recreate loud or explosive audio signals that rise very quickly, without distorting or clipping. In order to have high headroom (an ability to achieve loud peak levels without distorting), and amplifier must have a solid power supply with a good amount of reserve energy on which it can call. Headroom, also referred to as dynamic headroom, is measured in decibels (dB). An amplifier with a rating of 3 dB can double its output power for peaks. Look for an amplifier with a rating of 1.5 dB or higher. It is important to have an amplifier with a strong power supply.
Slew Rate- Fastest rate at which an amplifier can change the amplitude of its output signal measured in volts per microsecond with a higher figure being better (meaning that the amplifier can change more voltage in a given period of time, one microsecond). An amplifier with a good slew rate can quickly alter the amplitude, or power/volume, of a signal. This is an important characteristic for reproducing sudden, extreme changes in a signal such as those developed with an explosion or similar loud, powerful, sudden sound. Slew rate is the response rate to an increase in amplitude.
Now notice that the damping factor for the 2 are measured at different frequencies. The Parasound at 20Hz and B&K at 50Hz. I think it's safe to assume that stopping a 20Hz signal is harder than stopping a 50Hz signal. Now the B&K doesn't have the lowest damping factor I've seen in fact it is similiar to the Rotel, but the worst I've seen was actually from a McIntosh 5 channel amp my friend has and that's at like 150 or something, it's really low. Also notice that www.AudioVideo101.com says that the dynamic headroom should be at least 1.5dB and that B&K doesn't meet that, but it does have a damping factor higher than 300.
Again I'd like to say that I've never heard these amps before, but from looking at the stats it doesn't appear to have a very powerful power supply. I also don't own a Parasound. These are just observation of stats. So, whad'ya think?
Daniel Smith