Micro battery system

thanks very much, will have another fiddle and measure Thumbs Up

Ok - LR24 should give the best phase response already. Try what I said and see what happens. Smile

Earplugs Are For Wimps!

Then it definitely looks like some phase/group delay issue around the crossover point. Try what I said and see if it makes any difference. Can you change the crossover points, etc. on the ADAU1701 you have?

Earplugs Are For Wimps!

It might seem counter intuitive but there's a chance you've got a diffraction issue by recessing the HF driver, or a reflection coming back off the protruding box sides for mounting the grill. Have you tried measuring the HF driver in free air?

carlosdelondres wrote:

Earplug wrote:

Very neat. The peak at 200Hz obviously doesn´t matter if you cross over below. The dip is more difficult. It looks like the speaker rolls off very rapidly from 4kHz and the tweeter doesn´t reach there either, so apart from trying a different tweeter, or 3", it will be down to eq.

But if it sounds ok to you, don´t worry about it - I´ve seen worse on some commercial cabs! Dead

Thanks very much - the 200Hz peak is somewhat audible, but getting the mid tops to go lower isn't really possible. Central plenum needs to be shallower to push it higher, and the inner port lengthened to compensate (I think)...live and learn.

The 5.5kHz drop off is more mysterious - the 3" drivers are monacor sph30x and the tweeter is a Dayton ND20, both should be farily flat through the range used. With the 3" I guess they might be at the uppper range in which they will couple, the tweeter, dunno - something to do with the baffle size/layout...? Just wanted to keep the frontal area low and the drivers as closely spaced as possible...

Ok - a bit of a long-shot, but have you tried flipping the polarity of the tweeter? Might help.

Earplugs Are For Wimps!

Earplug wrote:

Very neat. The peak at 200Hz obviously doesn´t matter if you cross over below. The dip is more difficult. It looks like the speaker rolls off very rapidly from 4kHz and the tweeter doesn´t reach there either, so apart from trying a different tweeter, or 3", it will be down to eq.

But if it sounds ok to you, don´t worry about it - I´ve seen worse on some commercial cabs! Dead

Thanks very much - the 200Hz peak is somewhat audible, but getting the mid tops to go lower isn't really possible. Central plenum needs to be shallower to push it higher, and the inner port lengthened to compensate (I think)...live and learn.

The 5.5kHz drop off is more mysterious - the 3" drivers are monacor sph30x and the tweeter is a Dayton ND20, both should be farily flat through the range used. With the 3" I guess they might be at the uppper range in which they will couple, the tweeter, dunno - something to do with the baffle size/layout...? Just wanted to keep the frontal area low and the drivers as closely spaced as possible...