We'll have to agree to disagree WRT most consumer/DIY apps [ignoring tube driven or high efficiency] since ideally the first thing to consider is how loud [average and/or peak SPL] at low distortion does one want/need for the intended app.
GM
Yes. The 2nd generation on MA meta; cone drivers do not fit into the stereotyped metal cone mold. There are likely others as well.
dave
After reading a lot on OB, and this in particular, Im thinking of using the A7 with open baffle and and some large MCM woofers.
The A7 would be run fullrange, with passive lowpass for woofer
How would you find the cutoff frequency for the lowpass?
Im guessing there isnt a simple way to find it and OB is where active EQ becomes even more useful, especially for beginners.
any general advice is welcomed too. Im not sure about the safety of the alpair without XO, it would produce much less audible bass in OB but the amplitude of the bass signal driving it would still be the same.
The A7 would be run fullrange, with passive lowpass for woofer
How would you find the cutoff frequency for the lowpass?
Im guessing there isnt a simple way to find it and OB is where active EQ becomes even more useful, especially for beginners.
any general advice is welcomed too. Im not sure about the safety of the alpair without XO, it would produce much less audible bass in OB but the amplitude of the bass signal driving it would still be the same.
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Have you read any of the threads here about OB using a wideband and woofer? I strongly advise you use a crossover
Have you seen this thread? Fast, fun, Inexpensive OB project You will find a lot of support. If you are looking more specifically try a google search adding "diyaudio". If you want to learn about OB and dipole speakers have a look at Linkwitz Lab site
this was the other post, the first answer was wrong and it got corrected later, as suspected no audible bass from the FR driver doesnt mean it isnt responding to those bass frequencies.
You have a choice between the distortion of a crossover cap or distortion from the unfiltered inaudible bass for the FR. either way OB kind of interferes with the premise of WAW, pushing the XO frequency higher.
You have a choice between the distortion of a crossover cap or distortion from the unfiltered inaudible bass for the FR. either way OB kind of interferes with the premise of WAW, pushing the XO frequency higher.
The 7p's are alone on some decently sized open baffles, right away the sound is very nice at low volume with no run in. Bass is scarce as expected but it is nowhere near as bad as I thought. As an openback headphone user its acceptable for now, If someone was used to speakers it might be a problem. this is at around 1-1.5m away.
How large is the baffle? Mounting them of centre, so that the distance to the edge varies, helps smooth out the dips
510x550mm, they are mounted 120mm down from top and 200mm in, this was to leave room for a woofer but it looked good in edge and I read a post that mentioned offsetting them from centre (i think it could have been your post actually)
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