I want to increase the power of the dt680. Is the first thing I should look into doing is to upgrade the amp if so how would I go about doing that? I’m looking for increased power, bass (especially low bass) and no distortion. Thank u.
From “pimp my ride†to “pimp my boxâ€
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Reli
Boomus Fidelis
Upgrading the amp is too much work, and modern class-D amps don't sound as good as the old-school stuff anyway, IMO.
I would focus on the speakers. Take them apart, put Dynamat or Rockmat on the interior walls to reduce resonance, and upgrade the speakers. What size are the woofers?
I would focus on the speakers. Take them apart, put Dynamat or Rockmat on the interior walls to reduce resonance, and upgrade the speakers. What size are the woofers?
I believe they are 5.25 inches. The dt680 sounds amazing. One of the best bass boxes out there. I just think that if I were to upgrade the amp it would sound even better at higher volume. I believe a better amp will complement the speakers ability even more.Reli said:
Yea you're right. It’s so weird though because the deep bass is truly exceptional and as the volume is turned up that deep bass utilizes all of the speaker travel to move lots of air to produce great sound. It’s the mid bass that’s the problem. At a certain volume level, the mid bass stops taking advantage of the tons of speaker travel left to use and more volume only increases distortion. It’s as if the power behind the mid bass is restricted. That seems to be a bad characteristic of dt680 in general because I’ve had several and they all do the same thing. It ruins an otherwise very impressive deep bass monster. I believe a better amp would address this or maybe a lower resistance in the circuitry of the midbass. Changing the speakers doesn’t help. It’s the amp in my humble opinion.Reli said:
Yes. I connected the speakers from my JVC-PC55 and it’s the same. Headphones is the same too. Deep bass is awesome midbass doesn’t take full advantage of speaker travel and is distorted at higher volume.Fatdog said:
Why would an amp produce the more power hungry deep bass cleanly yet distorts the midbass ( which requires a lot less power). It makes no logical sense to me. If it has the power for the lows then it’s more than equipped to handle the mid bass yet it doesn’t. Why?JVC Floyd said:
Does anyone have a pic of an open box680 showing where the amps and the pre-amp is located? Thank u!!
Radio raheem
Requiem Æternam
I find the 680 superb only not loud enough......i can't remember but i think the main drivers are only 1.5 ohms, something like that so i doubt you would find better speakers also the bass ports are tuned along with the speakers...
i wouldn't worry though as i think they sound better than the fabled m90 so that can't be bad.
if you buy the one without cd the tape gain can be adjusted (not on the 680) making it louder yet again
The rx ct990 is the one to get adjustable tape gain dolby and no cd with line in
i remember now, pretty sure the main drivers are 3 ohm.
i wouldn't worry though as i think they sound better than the fabled m90 so that can't be bad.
if you buy the one without cd the tape gain can be adjusted (not on the 680) making it louder yet again
The rx ct990 is the one to get adjustable tape gain dolby and no cd with line in
i remember now, pretty sure the main drivers are 3 ohm.
The 680 has 4 amps, one for each speaker with the drivers being fed a completely different set of frequencies. Trying to upgrade the amps is a hiding to nothing. The speakers are specifically tuned to the cabinets. Even slight adjustments here or there will destroy the sound. Ever tried removing the rubber grommets at the rear of the cabinets - completely kills the bass!!
I need to get to the bottom of why these things distort midbass. Makes ABSOLUTELY NO SENSE WHATSOEVER when the deep bass comes thru so cleanly. Clearly I’m the only one on here who seems to care enough to get to the root cause of it. It ruins what is otherwise one of the best sounding boomboxes ever built. If it wasn’t for the midbass distortion this would truly be a low powered home system. The deep bass is THAT good.
Here’s what I’ve noticed. If I play a midbass tone and slowly turn the volume up I slowly see the speaker travel increase as well. But then it comes to a point where the speaker travel reaches a limit despite the fact that there is clearly enough excursion for the speaker travel to increase but it doesn’t and continuing to turn up the volume just produces a terrible distorted sound. Yet when I play a deep bass tone the speaker travel greatly increases and produces a clean deep bass tone. Why doesn’t the midbass take advantage of all of that excursion available as I increase the volume?JVC Floyd said:
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