Dayton Audio DSP-408 4x8 DSP Digital Signal Processor for Home and Car Audio

Installed this in my car using the 12v power wire and ground. Works well, the software is straight forward and easy to use. I have not purchased the Bluetooth adapter, Only complaint is the noise it produces, a hum is audible as soon as the unit is powered on. I have tried changing power and ground locations but nothing will fix it. After a bit of research online, it seems like these units are hit or miss for the hum. I guess I was unlucky and got a bad one. The hum is not terrible, but can be annoying at low volume.

I bought this DSP because of the 4 inputs and the RTA capabilities. It turns out you have to use a 3 party app for the RTA, but no big deal. The sound quality is excellent, yes there is a very slight bit of electrical noise off the alternator, but I was able to minimize it with the EQ to nearly inaudible. It's easy to use, sounds great, and the price can't be beat. My biggest regret is not having one sooner!

The functionality is great - though there are a few use problems. The power on-off function via the rca inputs was a bust for me, so I switched it to the remote option on the suggestion of the manufacturer. This solved the random on-of problem. It also seems prone to an output spike shortly after being turned on. I have some delay while my units power up, so this is usually not a problem for me, but it is unpleasant if it happens.

This works kinda/sorta but the price tag is at least $70 too high. Unless you need the 4in x 8out channels, it's better to get a miniDSP 2x4 HD (2in x 4out) for about the same price.Pros:(1) Easy to use (within its functionality limitations).(2) Could be used as an active 2 way crossover for 4 audio signals(3) Attractively packaged, sturdy construction, nice connectors, nice anodized exterior.(4) Programming model is easy enough.(5) Satisfactory (IMO) arrangement of connectors.but...Cons:(1) the residual hash in the output is consistent with a 48KHz sample rate (a bit low).(2) it has relatively low available output level and can easily be driven into clipping, An input exceeding about 1.5Vrms will cause output clipping regardless of the output level. Conversely, the output will clip at anything more than about 2.5Vrms out.(3) It can't be programmed for freq's lower than 20Hz. It will pass such frequencies but you can't program e.g. a 10Hz high pass. So you can't create a 10Hz high pass to protect a sub that you don't want to drive any lower than 10Hz.(4) The users manual is terse, much of the functionality is either implicitly described or not described. Read it very carefully for clues.(5) The Windows GUI can not be resized and worse the overall EQ freq plot will not show more than /- 12dB so the plot in many cases is not fully visible. Note that the device can provide more than 12dB cut/gain but the curve goes outside the graphical box when it does so.(6) It appears that you can not use just any decent BT adapter, only the Dayton adapter. If there are no Dayton BT adapters available (such as right now) then you can't use your phone to control. Very lame.(7.a) Since the PEQ doesn't permit more than /- 12dB, per PEQ band you have to use more than one PEQ band at a given freq to get more than /- 12dB (this works but see (5)).(7.b) However doubling up eats up PEQ's and there are only 10 though perhaps you could wrap an output to an input to get the effect of 20 PEQ bands eating up an input and output (I wouldn't do this).To me, the potential for clipping is the most worrisome problem. I'm not sure I would willingly pair this with a high power subwoofer amp (e.g. SP2-8000HT). You would need to be VERY careful to never permit clipping, an 8KW square wave could fry the cone of nearly any subwoofer driver (better hope the amp clipping protection blocks it).That said if you are using this with downstream gear having balanced inputs, a workaround could be to program a pair of outputs to be the same except with one inverted (i.e. 180deg out of phase) to provide a balanced max of about 5Vrms at clipping onset (according to my 'scope it should work but it eats up outputs). You could also use a downstream signal amp (still a workaround).At least these changes are needed: the BT interface should be updated to work with any decent BT usb device, the output levels should be able to drive higher levels or implement clip protection, the Windows GUI needs to be resizable and the EQ plot needs to accommodate the actual EQ curve. Maybe a version 2. Or just get a minidsp.Mine is going back until the above issues are fixed.

The sound quality is amazing. Very satisfying.