N4004 Sound Box Speaker Replacement

Hi everyone,

I have an old sound box with a speaker that has deteriorated - the rubber bit around the cone has perished. I see that there are lots of different 90mm x 50mm speakers available which would fit, but I'm wondering if anyone would know the spec for the speaker - how many watts and ohms?

Thanks!

By the way, I measured the resistance with my multimeter and it shows 29 Ohms which seems pretty crazy, could this be a 32 Ohm impedance speaker?

Its a Sony 1-503-258-22 8ohm, 5w speaker

Thanks. That part number appears to be vintage so what do you think about using this in its place?

https://www.ebay.com/itm/SoundTraxx-810090-50-x-90mm-Oval-Speaker-5-Watt-8-Ohms-New/254439147941?epid=1453394093&hash=item3b3dc149a5:g:uv4AAOSwBXld4yhO (https://www.ebay.com/itm/SoundTraxx-810090-50-x-90mm-Oval-Speaker-5-Watt-8-Ohms-New/254439147941?epid=1453394093&hash=item3b3dc149a5:g:uv4AAOSwBXld4yhO)

Hello Hawk: That looks like it should work :) I bought one to try out, I guess we will find out. Best regards Rob Blessin

I think electrically it will be fine. I've used one that looks exactly like it. I remember it being cheaper though. You will find that the physical depth is shallower so you'll need to use something to secure it in place. The current rubber backing will likely be too stretched out.

I found a cheaper option: https://www.parts-express.com/visaton-sc-59-2-x-35-shielded-full-range-driver-8-ohm--292-551#lblProductDetails

The US-centric site shows it as "2x3.5" but the linked spec is 50x90mm. As you say though, it's only 40mm deep whereas the original is 50mm so some creativity is going to be needed for installation.

Separately, it's really interesting to look at how the sound box is put together. NeXT must have planned to manufacture these things in serious quantity - it appears to be put together in a way that makes assembly very quick, using techniques of the time and a USA manufacturing facility. The board seems designed to be used in many applications; the sound box leaves a number of connectors unused.

It's like looking at an alternate history of computing that almost never happened.

The soundboard inside is identical to what is used in the megapixel monitor. That connector is for the video signal. You can read a bit more about some of the hardware details here but in a different context:


http://www.asterontech.com/Asterontech/next_adb_conversion.html

That's pretty cool. Regarding that mono video connector, if I connected a monitor to that, I'd get a monochrome composite video signal?

I received the speaker from here https://www.parts-express.com/visaton-sc-59-2-x-35-shielded-full-range-driver-8-ohm--292-551#lblProductDetails and it seems to be a pretty good replacement.

The only thing I needed to do is to add a bit of spacing to the back of it, which was conveniently the size of the folded receipt... a little soldering of the connector and it fit perfectly.

So I would recommend this as a replacement.

**EDIT**

I've tested this on my turbo color slab and it's VERY quiet. Any suggestions what might be wrong?

@hawkman Did you manage to get the Visaton speaker to work?