This Is a Brand New Aftermarket CARVIN Diaphragm For DH-HT151-16 Screw-On 16 ohm Driver The DH-HT151-16 is a replacement diaphragm used in several Carvin loudspeakers listed below. This part was also known as DH1000 and HFDD20. This is a replacement diaphragm for the HT-151-16 HF assembly. Here are some Carvin loudspeakers that use the DH-HT151-16 replacement diaphragm: