Reply to thread

Message: <blockquote data-quote="Peter Morris" data-source="post: 138511" data-attributes="member: 652">Re: New DIY Mid HighA couple of points I should mention again;· The whole idea of this project was to put as much power and quality on a stick as I could.· It was initially designed to work with our existing racks, all of which include Lake processing and Powersoft K6 & K10 amplifiers. However a simpler version with a passive HF+VHF and IIR processing will still work quite well. · I would have liked to get down to 80 Hz at full power, but horn loading the 12" drivers down to that frequency made the box too big.· If I was prepared to compromise at 100 Hz, it all worked. It does go lower but the output is is limited.· To minimize the box size and weight, there had to be virtually no unused space within the box.· To minimize the box size I also had to fold the LF horn. It’s about 2 feet long which load the horn down to about 130Hz - 150Hz, below that it’s assisted by the port. If you don’t fold the horn and use an approach like Danley’s synergy horns, the box ends up being about 3 or more feet deep.· The LF horn will only work up to about 800Hz. If you want to go higher the volume between the speaker cone and the mouth of the horn needs to be reduced. I suspect a phase plug like Fulcrum uses will be needed. In addition a driver with a lighter cone would be needed. It may even be necessary to use 10” driver. In either case the LF performance will be compromised.· For the best pattern control the box needed to be roughly twice as high as it is wide. · If the crossover frequency was around 700Hz and the width of the box kept down to about 15 inches, then the sides of the horn could be parallel and not cause horizontal directivity problems. · If the width of the HF horn was similar to the width of the box, the pattern of the LF and HF would integrate well (in this case only).· The maximum height of the HF horn was limited to about 1 ft.; more than that would cause vertical pattern and cancellation issues.The things I don’t like about the design;· At 34 Kgs it’s a little difficult to lift onto the “stick”· Having the horn located in the middle of the box solves a lot of acoustic problems but you need to lift the box a little higher. The things I like;· It sounds great; it’s clean, clear, smooth with no harshness. · The separation between the instruments in the mix is exceptional.· It goes loud effortlessly and fills the whole room evenly with sound.· Although it’s not rider spec the initial reaction to the box locally has been so positive I starting to win work because of it. </blockquote>

Verification

Top Bottom