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Build a closed speaker box about two feet deep and big enough to house whatever sepaker you choose. THis box will be totally enclosed. IN the end that the speaker is facing, install a port with a fitting over which the tubing for a stethoscope will fit. Voila! There's your practice speaker for your Blues Jr. You can get a used stethoscope...mechanics use them so a parts/tool supply will have them at a reasonable price.
Have I ever tried this? NO. Has it ever been done? YEs. Some people use such a device as an isolation box when recording. IF you try this, let us know how it goes.
The truth is, there is nothing that sounds like a tube amp that has the power tubes cooking and the air moving. There is no substitute. Every option has its drawbacks. A load reactive attenuator would be the best of the thing discussed so far.
This speaker isolation thing has always intrigued me. Someone was marketing them back in the late '90's, IIRC. THe plan for one could get very complex if one thought about it long enough. IF the box is totally sealed, then the reaction of the speaker is damped. That leads one to consider how to baffle the thing so that it could be ported. This might do away with the need to use the stethoscope/ariphones??? STay tuned...I might build one up out of curiousity. The drawback might be that it could be much bigger than the amp! LOL....just to contain the muflling aspect!
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