Identifiying Ohms of a combo amp without pulling out speaker

[BahamaDada]

Hey folks,

some time ago I got a little Blackstar HT5 combo. The first edition, that was Made In Korea, that had a G10 40 Celestion in it.

A friend from around here gave it to me for free.

I don't know the impedance on that thing and I also don't know if it is plugged into the right jack. (There are 3: 1x16, 1x8 and 2x16; or something like this).

From looking through the back grille there is just the speaker type visible. No ohms or anything.

So: Can I identify that some way without pulling out the whole speaker and hoping for a mark on the top or side?

 

[Alex Kenivel]

From looking at all the ones for sale, it looks like they're all plugged into the first speaker jack, whatever it's labeled. That's probably it?

 

[Alex Kenivel]

You can also use a multimeter

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[BahamaDada]

From looking at all the ones for sale, it looks like they're all plugged into the first speaker jack, whatever it's labeled. That's probably it?

Very good tip!

I found 2 of the old models (and many of the newer ones with Blackstar speakers) on Kleinanzeigen and it seems as you said: 1st jack after the power cord.

 

[BahamaDada]

Btw interesting (to me) info about that Celestion G10 40:
From TGP. "...the G1ON-40 was first developed with an OEM with the mindset of it being a slightly chimier (is that a word?) version of the of the G10 Greenie. They were real happy with it and gave the blessing to release it to "everyone" hence it's now a standard model. I am glad to hear you guys like it. It's a bit "under the radar" as our range goes, but word is getting out and I think it will be a big success. Best of luck!" Rick Skillman, Celestion LTD UK

I thought that G10 40 is just some horrible OEM speaker they throw into cheap combos. I mean, it is OEM, but with a rather nice twist? It definetly sounds sweet. Keeping it.

 

[Byrdman]

Ohm Meter will tell you. Keep in mind that the reading will be a little lower than the ohm of the speaker

 

[PLX]

Ohm Meter will tell you. Keep in mind that the reading will be a little lower than the ohm of the speaker

Yep.

A loudspeaker is a reactive device, so the Ω is measured as impedance (AC circuit), rather than resistance (DC circuit).

But, for this purpose a simple meter will give you a close enough reading as to the speaker's impedance.

 

[BahamaDada]

Yep.

A loudspeaker is a reactive device, so the Ω is measured as impedance (AC circuit), rather than resistance (DC circuit).

But, for this purpose a simple meter will give you a close enough reading as to the speaker's impedance.

Where do I measure this? I have a multimeter here, but next to no electric experience.

 

[gearJunkie]

You can measure directly from the speaker terminals if they are accessible. Otherwise, measure between the tip and ring of the speaker cable.