It's all about the setup. The bass output from the outer speakers isn't needed. The super woofers provide that. So, I start off with the bass knob all the way down, and the super woofer controls at maximum. Then I turn on the loudness switch, and the radio echo switch to the top position (adds another nice red LED to the tuner on radio mode , and can make the sound a bit louder with more definition). With this setup, the 777 sounds very nice, I believe partly because the outer speakers aren't trying with the bass. Too much bass can wipe out the treble from the sound on these speakers, so I leave that to the inner woofers. Then, a bit more bass can be added with the bass knob because the super woofers are at maximum. Still, the outer woofers aren't being pushed for bass because the bass knob is only at 2 or 3...

Just a tip.

Great Retro I will try it out. Thanks man.

Cool! I'm going to try that out right now... brb.

Fantastic. I'll have to try that, though it negates most of the bonus from my recently installed side speakers.

I just replaced the tweeters in mine; pretty sure both were blown or were terribly weak, especially judging by the sound difference. Now I'm really, really pleased with the all round sound she can produce. Clean and rich with a bunch of punch!

Just got to take her apart one last time to sort out a couple of vibrations inside the case on higher volumes.


Rock on.

yes, its all about sound tuning with the 777 and you get awesome sound!!...just like a race car when you tune it you get better performance...

Also, as this model lacks in treble with the original outer woofers, I leave the treble at maximum all the time. I've been playing around with it because I want it to make the best possible sound for the car show I'm going to, mentioned in this thread.

Well whadda ya know! It does actually make a difference (at least to my ears). It doesn't sound quite as muddy as before. I don't know if I'll use the method all the time, but for some songs most definitely. Thanks, Retro!

I actually was trying that with my 919 testerday and discovered it sounded great with the super woofers at 80% and the bass dial at about 1/8th-1/4 at half volume (depending on a songs recorded volume and bass level). My iPod set at; Settings->EQ ->"Acoustic". Thanks for the tip! Much appreciated.

Kind of makes sense, I'm going to try it next chance I get.

the gf 777 really thumps in certain places and sounds like crap in others but its a hard box to to tune but the potential is there it has plenty of power just the speakers are its weakness,besides that a totally bad ass box .

Curious here if when you take this apart ... would it help any with the stereo seperation and with the bass output to put 2 thin walls ( about 1 inch thick ) of fiberglass insulation between the 2 inner woofer's to seperate them from the 2 outer woofers and do this in such a manner that the 2 inner speakers have more air space to reverberate in than the 2 outer woofers and theroecticly increase the space inside the cabinet a little bit and allow the 2 inner woofers to have more air space to get deeper bass and only allow the outer woofer's to have the tighter basss ? Wouldnt this sound a bit better ? James

quote:

Originally posted by Gluecifer:
Fantastic. I'll have to try that, though it negates most of the bonus from my recently installed side speakers. I just replaced the tweeters in mine; pretty sure both were blown or were terribly weak, especially judging by the sound difference. Now I'm really, really pleased with the all round sound she can produce. Clean and rich with a bunch of punch!
Just got to take her apart one last time to sort out a couple of vibrations inside the case on higher volumes. Rock on.

nope your just flattening out the overall sound , your best bet would be better speakers it really wakes em up i mean big time.

quote:

Originally posted by DecentMan4you:
Curious here if when you take this apart ... would it help any with the stereo seperation and with the bass output to put 2 thin walls ( about 1 inch thick ) of fiberglass insulation between the 2 inner woofer's to seperate them from the 2 outer woofers and do this in such a manner that the 2 inner speakers have more air space to reverberate in than the 2 outer woofers and theroecticly increase the space inside the cabinet a little bit and allow the 2 inner woofers to have more air space to get deeper bass and only allow the outer woofer's to have the tighter basss ? Wouldnt this sound a bit better ? James

You would reduce the volume (air space) inside the box for each speaker by doing this. I think you'd kill what bass you have. What you are attempting to achieve...I'm guessing...is a sort of pseudo acoustimass for the center woofs and a sort of sattellite effect for the outer. The design of this box seems to preclude this.

you need a certain amount of empty space to give it accousic characteristics these cabintets resonate and actually boost sound out put.

Would some Dynomat help in this situation
sound proofing Dynomat
as I have used this stuff to help with the panel's NOT Rattling. James

quote:

Originally posted by jvc floyd:
you need a certain amount of empty space to give it accousic characteristics these cabintets resonate and actually boost sound out put.

I'd love to put some of that Dyn-o-mat stuff in the case, but it's dear as poison in Australia and only sold in amounts much greater than what I need. From what I read on here in another thread you only need a small amount in the case to make it effective.

I'll ask around some mates who have ludicrous car stereos and see if they've got a small amount to sell me.

I doubt theres little more you can do to enhance the sound already being produced without a complete redesign of the speaker space and housings. Then you get into making all the sections sealed properly for tighter bass and less booming. Good fun to experiment with on other boxes though as JVCFloyd has proven with brutal results.

I think it's a miracle in itself that these battery powered portables boxed in thin and vented plastic can produce good bass at all, let alone some of the brilliant sound you can get with a bit of tinkering.


Rock on.

dynamat is great for stopping vibrations ,it will improve the sound quality as well ,but you have to be careful not to block the ventilated areas so the electronics still have plenty of air to cool them.

and in this idea of ventalation I was thimking of using those little 12 volt case fans as used in the making of computer's to cool the Electronic's from the inside since most of the bettter bbox's operate on 12 volts to begin with and this would help in that area of cooling ... attach them to blow on what look's like the amplifier heatsink inside the boombox and i would think that this would possible improve the output of the amplifier unlike what they had back then for cooling ... just add a heat sink ....

quote:

Originally posted by jvc floyd:
dynamat is great for stopping vibrations ,it will improve the sound quality as well ,but you have to be careful not to block the ventilated areas so the electronics still have plenty of air to cool them.

quote:

Originally posted by Gluecifer:
I think it's a miracle in itself that these battery powered portables boxed in thin and vented plastic can produce good bass at all, let alone some of the brilliant sound you can get with a bit of tinkering.


Rock on.

I always wondered how that was possible. However it's possible all I know is I enjoy it as much as I can.

I think it is better to turn the Woofers off (audjust woofer volume to minimum) and then adjust the volume to the loudest position you want to listen, turn the bass to the point where the full range speakers don't distort anymore, then adjust the woofer volume to the loudest point without distortion, it will sound more "full ranged" then with the woofer volumes on 10. I always got the woofer volumes at mid position, if they are louder they begin to distort very easily and at higher volumes you can't offset that with the main bass.

The Tape distorts easier then radio because of the vibration of the big speakers. The wow and flutter effect that comes from the hard bass sounds like harmonic distortion then, because the tapes are direct over the speakers, if the belt is older it distortion is higher then with new belts. The belts inside are in touch with everything, it goes to the capstan and to the reels too, when the belt begins to vibrate the vibration comes over to the capstan and then the tape begins to distort, it is impossible to stop this effect, it would only work with a direct drive capstan quartz controlled to always get the same tape speed and that would be too expensive and cost more battery power. The JVCs got a Subchassis, maybe that helps to eleminate this wow and flutter effect at higher volumes, i never heard it on the M70, it sounds totally clear at Volume on 10, but it has not such hard bass and is not so loud then the GF777, could be that this is the reason...

Cheers, Tobi

...not here to ruffle up the feathers, but what's the point??? it still ugly as sin, and if you have to do all that to "try" to make it sound better, then there has to be a sound reproduction flaw in it as well as a major design flaw!!I am ready with my armor on!!

I think it really sounds good and the look is nice. It's a beauty, the M90 looks boring... but should sound better, whatever, GF777 is a great sounding unit.

Cheers, Tobi

just a note I did a search on http://www.partstore.com/

and entered in sharp, GF-777 and they have woofers listed for sale new! for anyone that may need one or more.