12v linear power supply

Pretty much rule of thumb on average only 25% of monies spent actually goes into theProduct ,this includes case and packaging  the rest R&D overhead and markup.

that’s why intruth you cannot get anything good for that money 

the best LPS and made in U.S.A is Linear Tube Audio ,in MD .

for around $700. You get a well built unit using worlds best Belleson Regulators 

and exact voltage you need and DC  connector type . The finest sounding LPS  

under  $1k  ,save your money and buy this LPS,you will be glad you did !

@audioman58  Is not wrong.  For speakers the driver to speaker cost is at least 10:1, a major reason why some turn to in-house drivers. It's not just engineering but cost.

I've seen some brands like Rega pump up the ratio of the electronics even higher, say 20 or 30 to 1.  I'm thinking of a headphone amp I took apart once.  Ugh.

This linear power supply has got some traction on The Audio Standard

https://www.aliexpress.com/item/4001288349011.html?spm=a2g0o.order_list.0.0.55c218024DJ8dl