{"product_id":"grado-hp-1-headphone-amp-high-performance-can-jammer","title":"Grado HP-1 Headphone Amp - High Performance Can-Jammer!","description":"\u003cp\u003eWith revisions in place by Grado, we were interested in hearing the RA-1, with a large outboard transformer and new sexier knob and pot... with lovely wood frame. This model may also run on batteries or be attached to the beefy five pin plug umbilical on the rear side.\u003c\/p\u003e\n\u003cp\u003eAll cans, Grado made or otherwise, play more authoritative and dynamic with the AC version of the Grado. All cans! For the first time, non-Grado headphones were also maximized in the Grado AC edition. Fabulous! Plus, the musical\/definition differences between the 13 times more expensive HP-4 and the Grado AC was never more than about 20% max. Also, the AC was much more dynamic and open sounding than the older battery-only RA-1.\u003c\/p\u003e\n\u003cp\u003eThe Grado RA-1 AC is a killer compact design and has layers of musical elegance with all cans I used. Nothing bright, edgy, or lumpy about this design. You will look for the tubes, but find none. You get a huge helping of the sophistication and elegance of the all-tube E.A.R. HP-4 with the Grado AC, and that in just a 12 ounce, five-inch-long package!\u003c\/p\u003e\n\u003cp\u003eMade of mahogany and fitted with beefy connectors, the latest RA-1 AC from Grado is a giant killer. It works well with any cans, and maximizes Grado cans in particular to a tee. With batteries it is a very good unit, but plugged into the large transformer with an audiophile AC cable, get ready for extreme performance, and the best I have heard under $1000-$1500, ever.\u003c\/p\u003e\n\u003cp\u003eMost highly recommended for the headphone enthusiast looking for maximum bang for the buck, and an elegant solution to powering their favorite cans. In excellent overall condition - another instant classic. BOOM!\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eGrado RA-1\/AC: $299.00 plus shipping and sales tax when applicable\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Holt Hill Audio","offers":[{"title":"Default Title","offer_id":43231956205635,"sku":null,"price":299.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/2197\/6387\/files\/PhotoMay082026_104739AM.jpg?v=1778252975","url":"https:\/\/holthill.com\/products\/grado-hp-1-headphone-amp-high-performance-can-jammer","provider":"Holt Hill Audio","version":"1.0","type":"link"}