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Old 10-28-2013, 11:33 AM   #1
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Any reviews on JVC KD-R840BT head unit?

I replaced my speakers this past weekend with some 5-1/4" Kickers. While the sound is clearer, it isn't really any louder (I also put the soft top on this weekend, and realized I need more radio volume!). Has anyone bought and tried out this head unit:

JVC KD-R840BT CD receiver at Crutchfield.com

It has everything I think I am looking for.

-CD's without flipping the face down (don't know why but that annoys me, haha), but still has a detachable face
-Streaming Pandora wirelessly from my Android
-USB and audio jack on the back (so I can run extensions into my center console, to lock up the ipod)
-20w RMS/50w max seems decent on the output for my new speakers
-Close enough to my $150 ballpark price (easy to replace if/when someone steals it, haha)
-Pre amp outputs, so I can add more sound if I need to later on.

With that said, does anyone have any other suggestions for some other units to look for?

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Old 10-28-2013, 08:44 PM   #2
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None of those HU's are going to give you louder sound. For louder sound, you need an external amp. Then, the problem is that your Kickers really can't handle more wattage. If you have the Kicker DS525, they are only 35watts RMS.

Most of these HU's have a built in amplifier, which you access by pressing the Loudness Button. The problem is that they add a lot of distortion too.

Therefore the solution isn't the HU, because the loudness button will blow out your already limited Kickers with all the distortion.

You really need better capacity speakers, and a amp, if you want more volume.

The problem with someone stealing it, isn't just the loss of the stereo. They also smash your dash and likely the window to get into the vehicle and to get out the stereo. Therefore, you have to replace your window, dash, and the stereo.

The solution is to get a removable face(Which your current choice has), and take it with you always. Thieves won't waste their time with a stereo with a removable face. That is, if you take it with you.

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Old 10-29-2013, 11:44 AM   #3
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Well, I made an impulse purchase went ahead and bought the JVC Arsenal KDAHD75BT, since they had an open box one on sale for $160.

The speakers I already bought are the Kicker 40CS54, which are rated for 2-75w RMS with a max of 225w. They sound clear as can be but the stock radio volume maxes out at 38. I am sure the speakers can handle more without any distortion.

That was why I was thinking a new head unit that can put out a little more power per channel, would give me some more volume. Did I make a lousy assumption here? Worst comes to worst, I now have the RCA outputs to add an external amp.

The getting it stolen thing was more of a joke. I plan on removing the face every time!
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Old 10-29-2013, 08:04 PM   #4
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Ignore the max volume. That number means nothing in regards to speaker handling capacity. Always use the RMS value. The digital volume readout means nothing too. If you dial up to 19, then you are using half the power, or 10 watts.

Yes, the assumption regarding the HU providing more power is an error. The HU provides 20watts RMS. This is the value that you should reference when looking at the HU's Power. The loudness button should not be used for more power. The loudness button is used for adding fidelity at low volume. At high volumes, the loudness button adds a lot of distortion and could blow out the speakers.

This is why you need an amp for more volume above the 20watts, and then you won't risk blowing out your speakers, using the loudness button on your HU.

If you must use the loudness button for more volume, until you get an amp, just be careful to avoid putting too much distortion into your speakers. If you crank up the stereo with the loudness button pressed, you could still blow out your Kicker's with all the distortion. Distortion is one of the main cause for blown speakers.
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Old 10-29-2013, 10:09 PM   #5
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Quote:
Originally Posted by ChasUGC View Post
Ignore the max volume. That number means nothing in regards to speaker handling capacity. Always use the RMS value. The digital volume readout means nothing too. If you dial up to 19, then you are using half the power, or 10 watts.

Yes, the assumption regarding the HU providing more power is an error. The HU provides 20watts RMS. This is the value that you should reference when looking at the HU's Power. The loudness button should not be used for more power. The loudness button is used for adding fidelity at low volume. At high volumes, the loudness button adds a lot of distortion and could blow out the speakers.

This is why you need an amp for more volume above the 20watts, and then you won't risk blowing out your speakers, using the loudness button on your HU.

If you must use the loudness button for more volume, until you get an amp, just be careful to avoid putting too much distortion into your speakers. If you crank up the stereo with the loudness button pressed, you could still blow out your Kicker's with all the distortion. Distortion is one of the main cause for blown speakers.
Okay, thanks for all the info. Looks like an amp is next on the list!
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