A tiny three way with a twist

[Kruger]

Ah now I see how this works. I was wondering how you got the signal out. You basically create a new set of tinsel leads and terminals through the cone and on the basket.

Yes. It was quite a tedious job. The TangBand W5-1138SMF basket and cone are close together, and the magnet is relatively big. No space to put the connectors. No space for the coax wires and no space for anything. 🙄

 

[5th element]

But you managed is the important thing!

 

[andy19191]

Everyone is telling me, that tiny 5" driver and MFB cannot go together.

As you likely know, this company markets a small 2 way speaker with MFB on a 5" Scan-Speak midwoofer for €1500 a pair. Don't know how successful it is commercially but they are around. A slightly larger 3 way offering a bit more performance for a bit more money looks reasonable to me.

Voltage amplifier will be used. At least for start. They are available everywhere. If there is something working I may try with current amp.

Likely wise. A working first prototype and a well optimised developed speaker (e.g. Philips) are different things.

I am not good with speakers and was asking the same question myself about the added mass. At that time I used an online calculator.
The sensor is not 63 grams (7.5 grams actually). An extreme case was checked. Sadly the site is not available anymore. (mh-audio).

Added mass often isn't much of an issue for woofers/subs but it will lower the sensitivity a bit and require more power to restore the SPL.

Against rocking ... the sensor is positioned at the top of the voice coli. At the cylinder axis. Don't know if it is enough.

The longer the stroke, the less is required to deviate from moving in and out in a straight line. My comment was prompted by Boden's comment that Philips stiffened their suspension. However the 70s was in the days of floppy suspensions for acoustic suspension cabinets. A stiffer modern suspension may not have an issue. @Boden do you have a link to help clarify?

 

[Boden]

Unfortunately I do not have a link, but I vaguely recall one of the Dutch MFB builders was having this problem with the Reckhorn 6.5"/17cm midwoofer, which -BTW- otherwise is an excellent MFB candidate for very little money.

 

[Boden]

Andy, keep in mind that because of the large bandwith, the woofer is making large excursions in a small enclosure, leading to high pressures on cone and surround.

The Philips 86xx and 76xx series were never true acoustic suspension woofers like e.g. the Braun 20cm units (L/LB500 system) or AR 3/3a/4 etc. woofers, but had nonetheless rather soft rubber surrounds.