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Discussion Starter #1
So I finally changed out the HK for an Aquatic AV unit. I had to change the speakers anyway since one of the MM651s quit on me. I love the Aquatic AV unit even though it is the lower end one. It works great. All I did was plug and play. I was pressed for time, so I didn't bother trying to adjust the gains or anything. I already have the JL Audio HX280/4. In the meanwhile, I got to thinking that I really need to get back in there and adjust the gains with my DMM.....on second thought, I blew one speaker using the DMM, there has to be something better. I thought about getting an oscilloscope, but damn they are high. I kept on looking and ran across a thread here where someone mentioned Steve Meade, so I Googled that name. I saw a Youtube video of him doing setups using the DD1 and figured it was going to be more expensive than an Oscope. Wow! For $150 on Amazon, I can tune my head unit and know exactly where it starts to distort, then do the same thing on my amp. I can't wait to try it out.

My question is......has anyone here actually used one of these on an Aquatic AV? If so which dB test tone should I use?

Thanks
 

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So I finally changed out the HK for an Aquatic AV unit. I had to change the speakers anyway since one of the MM651s quit on me. I love the Aquatic AV unit even though it is the lower end one. It works great. All I did was plug and play. I was pressed for time, so I didn't bother trying to adjust the gains or anything. I already have the JL Audio HX280/4. In the meanwhile, I got to thinking that I really need to get back in there and adjust the gains with my DMM.....on second thought, I blew one speaker using the DMM, there has to be something better. I thought about getting an oscilloscope, but damn they are high. I kept on looking and ran across a thread here where someone mentioned Steve Meade, so I Googled that name. I saw a Youtube video of him doing setups using the DD1 and figured it was going to be more expensive than an Oscope. Wow! For $150 on Amazon, I can tune my head unit and know exactly where it starts to distort, then do the same thing on my amp. I can't wait to try it out.

My question is......has anyone here actually used one of these on an Aquatic AV? If so which dB test tone should I use?

Thanks
I just do mine by ear. Turn the HU half way up, adjust the bass, treble, exct. the way you normally listen to it. Then adjustment HU volume up 75% . Now adjust the amps gain until it starts to distort, then back off until it's smooth . sound. You're done. It's no oscilloscope exact, But it's close enough.
 

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Remember that the DD1 simply tells you the max level that your amp CAN be at without distortion. It is still possible that that level is too much for a given speaker. Think of the DD1 as the high limit finder, you will still likely have to back off some to protect your speakers, especially if you're bridged.


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Discussion Starter #4
Remember that the DD1 simply tells you the max level that your amp CAN be at without distortion. It is still possible that that level is too much for a given speaker. Think of the DD1 as the high limit finder, you will still likely have to back off some to protect your speakers, especially if you're bridged.


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I'm not bridged. I'm running the HX280/4 which gives me 50w per channel at 4 ohms. I'm running 2xMM652s and 2xDB652s which are rated at 100w RMS at 4 ohms. High limit should not be an issue for the speakers. My concern is what dB level test tone do I use to set the gains? -5 dB? 0 dB?
 

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I'm not bridged. I'm running the HX280/4 which gives me 50w per channel at 4 ohms. I'm running 2xMM652s and 2xDB652s which are rated at 100w RMS at 4 ohms. High limit should not be an issue for the speakers. My concern is what dB level test tone do I use to set the gains? -5 dB? 0 dB?
He usually does a first pass with 1000Hz pink noise at 0 db, then if you want some additional volume, do a second pass with 1000Hz pink noise at -5 db
 

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Discussion Starter #6
Well, I figured out that it sucks using the SMD on a head unit without a CD player. I had to upload the test tones to my phone use the Bluetooth. I could use an MP3 player, but the one I have is a PoS and I don't trust it's output. I figured out that the Bluetooth connection started to distort at a little over 1/2 volume on the phone. The headphone attachment/aux was clean all the way out to Max volume on the phone, but my phone is too big to fit inside the HU and the HU doesn't have an external AUX connection. Confused? Me too.....lol. Bottom line, I ended up getting it pretty damn close and it sounds great and is very loud. I'm happy with it.

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Well, I figured out that it sucks using the SMD on a head unit without a CD player. I had to upload the test tones to my phone use the Bluetooth. I could use an MP3 player, but the one I have is a PoS and I don't trust it's output. I figured out that the Bluetooth connection started to distort at a little over 1/2 volume on the phone. The headphone attachment/aux was clean all the way out to Max volume on the phone, but my phone is too big to fit inside the HU and the HU doesn't have an external AUX connection. Confused? Me too.....lol. Bottom line, I ended up getting it pretty damn close and it sounds great and is very loud. I'm happy with it.

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I simply placed the MP3 files onto a thumb drive when I did mine. I'm glad it worked out for you. I too have the SMD DD-1, and it works great. Unfortunately, I am still stuck with the factory head unit (2015) as I like the interface and navigation. The sound quality coming out of it is garbage and starts to distort a little beyond half volume. So I set the head unit, then I set the gains in my Arc Audio PSM, then set the gains on the amplifier. Now as long as I don't go beyond the mark at which the head unit distorts , everything is crystal clear.
 
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