Hi fellow Do’ers. First time posting, so I thought I’d make it a good one (I hope). Here we go!
Building a quite large, technically portable, semi-active 3-way loudspeaker using 4-ohm drivers (6 in total). Amplifier is a 4-Channel class A/B rated at 50W per channel RMS. Channels 1-2 will drive the pair of 10” woofers (95dB @ 2.83V/1m) using the amp’s integrated variable LPF. Channels 3-4, using the integrated variable HPF will drive both the Mid-woofers (90.5dB @ 2.83V/1m) and Tweeters (AMT type, 92.5dB @ 2.83V/1m) passively crossed starting at 4.5k, going as high as 5k thanks to the variable integrated HPF.
Whew, that’s a lot of specs.
I did the best I could to select drivers with sensitivities that are within a couple dB of each other keeping the total budget set aside for this project in mind. Since this will not be a permanent fixture and may be used in a broad range of acoustic environments, from well damped rooms, to quite reflective rooms with lots of windows, to outdoor settings like out on the deck, I want to be able to attenuate the mids separate from the tweeters, providing detailed and accurate stereo control for each pair based on which frequencies I need more or less of.
The interface for the system needs to be as minimalist as possible, one dial for mids, one dial for tweets, one master volume (went with a digital volume control by Sure Electronics) and push button system ON/OFF.
Finding an adjustable L-Pad for a single 4-ohm driver wasn’t too difficult. I can get four of them shipped from England to Los Angeles, no biggie. I’ve read that others have had success using a stereo 8-ohm L-pad and wiring it in parallel to get the same results, voila! Sadly, placing 4 dials on a single unit just to bring up or down the mids, or the tweets uniformly right and left, is far more involved than I’d care to put someone- who isn’t a tech dweeb like so many of us are- through.
Goal: Single dial adjusts volume output for two 4-ohm drivers. 1 dial, 2 drivers. 4 ohms per driver... . Two dials total. One for tweets, one for mids.
Is what I’m describing here even attainable? Or do I just take a deep breath and put an L-pad on my goal here?
Thanks!
Confusedly,
Evan.
Building a quite large, technically portable, semi-active 3-way loudspeaker using 4-ohm drivers (6 in total). Amplifier is a 4-Channel class A/B rated at 50W per channel RMS. Channels 1-2 will drive the pair of 10” woofers (95dB @ 2.83V/1m) using the amp’s integrated variable LPF. Channels 3-4, using the integrated variable HPF will drive both the Mid-woofers (90.5dB @ 2.83V/1m) and Tweeters (AMT type, 92.5dB @ 2.83V/1m) passively crossed starting at 4.5k, going as high as 5k thanks to the variable integrated HPF.
Whew, that’s a lot of specs.
I did the best I could to select drivers with sensitivities that are within a couple dB of each other keeping the total budget set aside for this project in mind. Since this will not be a permanent fixture and may be used in a broad range of acoustic environments, from well damped rooms, to quite reflective rooms with lots of windows, to outdoor settings like out on the deck, I want to be able to attenuate the mids separate from the tweeters, providing detailed and accurate stereo control for each pair based on which frequencies I need more or less of.
The interface for the system needs to be as minimalist as possible, one dial for mids, one dial for tweets, one master volume (went with a digital volume control by Sure Electronics) and push button system ON/OFF.
Finding an adjustable L-Pad for a single 4-ohm driver wasn’t too difficult. I can get four of them shipped from England to Los Angeles, no biggie. I’ve read that others have had success using a stereo 8-ohm L-pad and wiring it in parallel to get the same results, voila! Sadly, placing 4 dials on a single unit just to bring up or down the mids, or the tweets uniformly right and left, is far more involved than I’d care to put someone- who isn’t a tech dweeb like so many of us are- through.
Goal: Single dial adjusts volume output for two 4-ohm drivers. 1 dial, 2 drivers. 4 ohms per driver... . Two dials total. One for tweets, one for mids.
Is what I’m describing here even attainable? Or do I just take a deep breath and put an L-pad on my goal here?
Thanks!
Confusedly,
Evan.
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