GMCtrk Posted August 14, 2018 Report Share Posted August 14, 2018 Can't find the SMD DD-1 anywhere in stock. Currently running the Punch amps with the CLEAN system, essentially a built in DD-1. Anyone compare the LED outputs on the T2500 to distortion point on the DD-1 or clipping on an O scope? The RF manual says the Red bar (+2) dB indicates clipping. Thinking of just setting the gains to the orange bar with a -5 dB test tune. Link to comment Share on other sites More sharing options...
Joshdashef Posted August 14, 2018 Report Share Posted August 14, 2018 I've used my DD-1 even when I set my RF Punch 600x4 and I found the DD-1 picks up on distortion slightly before the Rockford amp does. I'm not sure if that can be applied towards the power series of amps but I think following the manual is a good idea regardless. SMD Tool Map (2022): https://www.stevemeadedesigns.com/board/topic/220267-smd-tool-map-2022/ My Port Size Calculator (in progress): https://www.stevemeadedesigns.com/board/topic/217087-port-size-calculator-in-progress/ Common Port Walls for a Slot Port: https://www.stevemeadedesigns.com/board/topic/217076-common-port-walls-why-it-matters-to-your-box/?tab=comments#comment-3240313 Link to comment Share on other sites More sharing options...
BassMunky Posted August 14, 2018 Report Share Posted August 14, 2018 Borrow from someone close by. Shakin not Stirred....my buildhttp://www.stevemead...ngle-cab-build/412 CVX And put a sealed enclosure in your trunk cut a hole in your deck and call it ported Link to comment Share on other sites More sharing options...
GMCtrk Posted August 15, 2018 Author Report Share Posted August 15, 2018 1 hour ago, Joshdashef said: I've used my DD-1 even when I set my RF Punch 600x4 and I found the DD-1 picks up on distortion slightly before the Rockford amp does. I'm not sure if that can be applied towards the power series of amps but I think following the manual is a good idea regardless. Well, the DD-1 and CLEAN measure different things. The dd-1 identifies 1% THD whereas the RF detects clipping.Just happens that the Punch amps hit 1% THD just prior to clipping. I'd imagine using the output meter on the T2500 should be fairly safe. I did come across a 17 second youtube vid showing a DD-1 on a t2500 and the DD-1 was both positive and negative with the red bar lit up. Link to comment Share on other sites More sharing options...
GMCtrk Posted August 19, 2018 Author Report Share Posted August 19, 2018 Well, to my surprise a 0 dB 40 Hz test tone at 49/50 on my HU (max unclipped) maxed out the T2500 output meter with the gains all the way down. Guess I shouldn't be too surprised as the input sensitivity on the amp is listed as up to 4v. My HU has 5v preouts. Link to comment Share on other sites More sharing options...
GMCtrk Posted September 20, 2018 Author Report Share Posted September 20, 2018 Just wanted to put a little update for you guys since I now have a DD-1. Based on the DD-1, the RF manual is incorrect. The red output bar does NOT indicate clipping. The 1% THD distortion light does not come on from the DD-1 when the bar first hits red. In fact, there is a fairly good amount of gain adjustment still there once the output bar hits red (+2). An interesting tidbit, all of my RF amps seem to make a very faint buzzing sound right before the DD-1 indicates clipping. Link to comment Share on other sites More sharing options...
audiofanaticz Posted September 20, 2018 Report Share Posted September 20, 2018 8 hours ago, GMCtrk said: An interesting tidbit, all of my RF amps seem to make a very faint buzzing sound right before the DD-1 indicates clipping. This is the same for a lot of Korean built amps as well, though its more of a whine or a squeal when the amp starts clipping (granted you only hear it when the amp is unloaded, so no speakers connected). Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.