Wednesday, May 4, 2016

New Folded Corner Bass Horns With New Straight Midrange Horns

The New Straight Midrange Horns are now fitted with small two inch drivers originally taken out of Boston Acoustics Unity enclosures.  The back chambers, recycled from the New Folded Corner Midrange Horn, are made from short lengths of PVC pipe.  Here are pictures of the left and right horns.

New Folded Corner Bass And Straight Midrange Horns - Left Channel
New Folded Corner Bass And Straight Midrange Horns - Left Channel


New Folded Corner Bass And Straight Midrange Horns - Right Channel
New Folded Corner Bass And Straight Midrange Horns - Right Channel
I tried making passive crossovers for each channel.  However, the midrange horns are even more efficient than the bass horns and I would have had to pad them down to get a good balance between the bass and midrange.  Instead of padding, I made a couple of line level crossover networks and now the horns are bi-amped.  RC low pass networks for the bass horns and RC high pass networks for the midrange horn allow independent control of the bass and midrange/treble amplifier gains.  Once a balance is achieved, the overall gain adjustment on the preamplifier allows the levels to "track" and stay in balance at any volume level.

Midrange and treble networks are plugged into a Lepai LP-2020A+ Amplifier.

High Pass Networks For Midrange And Treble - Lepai LP-2020A+ Amplifier
High Pass Networks For Midrange And Treble - Lepai LP-2020A+ Amplifier
Bass networks are plugged into the AUX input on a Pioneer SX-1280 receiver.



Low Pass Networks For Bass - Pioneer SX1280 Receiver
Low Pass Networks For Bass - Pioneer SX1280 Receiver
The bi-amp arrangement is also pretty handy when you want to raise or lower bass output relative to midrange and treble.  I have found that the bass level on some recent recordings is way too high so it is great to be able to adjust the bass level without altering phase as a result of the adjustment. 

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