diy WMTMW SEMI OPEN BAFFLE

[joz]

I WOULD LIKE to hear some serious thoughts about a big full range WMTMWdiy loudspeaker,with top hi-end drivers,using a compination of two worlds,the bottom woofer and midrange will be in a sealed box,and the upper mid and woofer will be in open baffle,i never saw a design like that i am thinking to build.Any strong recomentations for a woofer (12" or more) ,an excellent mid and a fine tweeter?

[dcathro]

I am about to build a 3 way with the bass driver in a box and the mid and top in an OB.

I will be using the Seas Exotic W8 and T35 (not OB) and JBL 15" bass drivers.

[tinitus]

Originally Posted by joz

using a compination of two worlds,the bottom woofer and midrange will be in a sealed box,and the upper mid and woofer will be in open baffle

may I ask why

[joz]

We well know that a woofer driver sealed in a box delivers stronger bass than a woofer in an open baffle,but the later operates in a more natural free way that eliminates the boxiness,the same occurs for the midrange drivers,so why not make a compination of both worlds?

[tinitus]

Yeah, but you still have the supposed boxiness using closed bass and mid

Are you suggesting that additional non boxed drivers will elliminate the boxiness on hand

Well, there might be some out phasing going on, but I have no idea about what will happen exactly

[eccentric]

You could build a U or H frame for the woofer section, that may partially help the boxiness. then go OB for the rest?

[LineSource]

SB29RDC tweeter ~ $50
compromise: it's not a dipole like some ribbons

Tang Band W6-1721 ~ $80 DIPOLE MIDRANGE
compromise: some rear dipole block from large motor

AE Speakers IB15 ~$125 DIPOLE WOOFER
compromise: 85db efficiency - need to parallel and boost with separate amp

[tinitus]

Those look nice

[HiFiNutNut]

If I need to choose OB and sealed between high and low frequencies, I would go OB at low and sealed at high. The Best is all OB except below the room fundamentals where sealed is good.

There is no loss of bass with a correctly designed OB bass.

[LineSource]

Tang Band W6-1721 with 0.5 Qts is suited for dipole midbass.

AE Speakers IB15 appears capable of low frequency dipole bass with a tall WMTMW baffle. Two in parallel ~ 92db/watt

Fs: 16Hz
Qms: 6.8
Vas: 439L
Cms: .45mm/N
Mms: 220g
Rms: 3.239
Xmax: 18.5mm
Xmech: 25mm
Sd: 830sqcm
Vd: 3.07L (p-p)
Qes: .78
Re: 5.5ohm
Le: .33mH
Bl:12.49
Pe: 500W
Qts: .7
1WSPL: 86dB
2.83V: 87.3dB

I do not know of a dipole tweeter that sounds as good as the SB29 dome.