|
Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
|
|
|
Bottlehead Forum Welcome! Need support, you got it. Or share you ideas and experiences. |
|
In Reply to: Another Forplay enters the world posted by Carl F on May 8, 2003 at 14:49:54:
The best place to put attenuation is often the amplifier's input, especially if very sensitive speakers are used. Since you built the amplifier yourself, you won't risk any warranties by adding a couple resistors to the input of each channel.A good target is to set up the amp/speaker so that 0.316vRMS (-10dBV) will produce 82dB SPL from the speaker. Google tells me the DH220 puts out 115 watts with 1.55vrms input, so 0.316 volts should make 4.78 watts.
The KG4 was rated 94dB at 1 watt, 1 meter. To get 82dB would take 12dB less power, or 1/16 watt.
The ratio is 4.78/.063, or 76.48. The voltage ratio is the square root of the power ratio, so a ratio of 8.75 or 19dB would be about right. Round it to 20dB if you like - what's a few dB among friends, after all?! As others have mentioned, a simple L-pad at the input will do the job.
If further attenuation is needed (and it may well be needed) than it should go at the Foreplay input. There is lots of information on that part.
This post is made possible by the generous support of people like you and our sponsors:
Follow Ups
- Attenuation - Paul Joppa 16:57:47 05/09/03 (1)
- Re: Attenuation - Carl F 06:24:17 05/14/03 (0)
Top of Page ]
[ Contact Us ]
[ Support/Wish List ]
[ Copyright © 2025, Audio Asylum, all rights reserved ]
