Hi George,
I have experienced all 3 models: Frey, Heimdall, SPM
Altough you will hear a small difference between the Frey and the Heimdall, the Heimdall will retain all the qualities you found in the Frey but to a lesser extent.
To my ears the new models Frey and Heimdall are clearly superior to the SPM, probably explaining why there are so much SPM on the used market right now. The new models are much more full sounding and musical, conveying more bass.
As far as the Baldur goes I haven't heard them but they are using the same technology as their big brothers, except for the NextGen connectors so they should retain the same sound charateristics.
I have experienced all 3 models: Frey, Heimdall, SPM
Altough you will hear a small difference between the Frey and the Heimdall, the Heimdall will retain all the qualities you found in the Frey but to a lesser extent.
To my ears the new models Frey and Heimdall are clearly superior to the SPM, probably explaining why there are so much SPM on the used market right now. The new models are much more full sounding and musical, conveying more bass.
As far as the Baldur goes I haven't heard them but they are using the same technology as their big brothers, except for the NextGen connectors so they should retain the same sound charateristics.