sentences:  Some felt that the sound quality actually improved, due to the purer vinyl used, and better processes for removing impurities in the vinyl compounds; others felt that Dynaflex pressings were noisier and lacked bass frequencies compared to conventional records, and also had more "rumble" (low frequency noise) than conventional thick pressings.While RCA claimed that Dynaflex records were less noisy and less susceptible to warpage and would last longer than conventional vinyl records, some consumers (particularly classical listeners) deridedly referred to the new product as 'Dynawarp' because of evidence that Dynaflex records were prone to warp on dealers' shelves, just from the pressure of the shrinkwrap on the album jacket.Some critics charged that Dynaflex was nothing more than a ploy devised by RCA to save money by using less vinyl material than in traditional, thicker records.