White M70 speakers installed........

[mellymelsr]

I was sitting at home bored and looking for something to do when it hit me.....I have never seen an M70 with white speakers. So I did some research and found an audiophile website that showed an easy way to do it with no discernible change in sound and it actually strengthens the paper fiber of the speaker (at least they say it does). So I went to my local craft supply store and picked up the items needed (acrylic craft paint and brushes). I chose white as the main color for the speaker cone and at the last minute decided to do the royal blue trim. I took the M70 apart and went to work. The paint must be thinned with water for a thin coat and smooth finish. Believe me it takes a VERY steady hand to do this in the two-tone pattern I used!! I was just hoping that after I started I hadn't ruined my speakers, but after putting everything back together they sounded perfect and I love the new look. Hope everyone enjoys the pics.....

 

[Superduper]

Way cool, Melly! Gives that M70 a fresh unique look.

That one spells Melly all the way and you'll be able to spot it a mile away in a bunch of otherwise clone M70's

 

[skippy1969]

Looks cool Melly,I like it!

 

[Gluecifer]

Beautifully done Melly! They look flawless, certainly give the M70 a bit more character, that's for sure.

Inspired!



Rock On.

 

[bill]

good choice for colors. the cool tones of the blue and white compliment the look of the original colour scheme of the box.
one thing i am not a huge fan of is when people mix hot tones with cold ones.
for example red and silver. or bronze and blue.
for me those always look well not to well thought out and the colors fight with each other.
this tho looks great.
just enough to be different without being looking ill thought out in terms of color scheme.

 

[redbenjoe]

melly -- few of your pix are very bright//sharp//clear --
but many have that fog storm look

is that an on purpose 'effect' ??

 

[Superduper]

It's your cataracts, Ira.

Sheesh, you are a tough customer these days, aren't cha.

 

[redbenjoe]

on the contrary ol chap
trying to be helpful --

perhaps it just MY screen --
i will remove the shower curtain

 

[mellymelsr]

melly -- few of your pix are very bright//sharp//clear --
but many have that fog storm look

is that an on purpose 'effect' ??

...I'm too lazy to focus the camera myself so it's on auto.....

 

[Master Z]

It looks great but I would think an audiophile would not suggest changing the mass of an OE speaker. What site was it?

 

[oldskool69]

As the reigning king of speaker whitening (ask they'll tell you ) the M70 looks dapper in white!

 

[mellymelsr]

melly -- few of your pix are very bright//sharp//clear --
but many have that fog storm look

is that an on purpose 'effect' ??

...it turns out you were right...there was a fog over the pictures. I checked my camera and found a huge, greasy finger print on the lens....Thanks for mentioning that because I probably would not have checked otherwise....

 

[redbenjoe]

glad you found the problemo -
because about 3 of the pictures you posted are like
brilliant clear --so we know your camera is high quality

 

[Superduper]

It looks great but I would think an audiophile would not suggest changing the mass of an OE speaker. What site was it?

As good as the JVC RC-M70 sounds, it's highly doubtful that ANY boombox with total harmonic distortion levels, as exhibited by the vast vast majority (if not all) boomboxes, would qualify it (or them) as audiophile grade. HiFi Boombox would be oxymoronic. Therefore, any degradation of the sound quality is probably negligible on a portable device.

That being said, I also have read that painting the speaker can and do affect the sound quality but whether the net effect would be positive or negative is entirely subjective. The site that posted the before and after review backed up their data with instrument readings and interpretations of the reproduced audio. IMHO, any time you need instruments to measure the effect of a tonal change, I consider such change negligible. Melly said he heard no degradation of the sound and is happy with the looks. I think that's all that matters.

Now, if you are gonna paint those vintage JBL's that might be an entirely different matter.....

 

[Superduper]

melly -- few of your pix are very bright//sharp//clear --
but many have that fog storm look

is that an on purpose 'effect' ??

...it turns out you were right...there was a fog over the pictures. I checked my camera and found a huge, greasy finger print on the lens....Thanks for mentioning that because I probably would not have checked otherwise....

Either Melly's fingers are too big 'n fat or the camera is too small.
Given the trend of photographic equipment, I'd guess the latter.

 

[redbenjoe]

slightly off topic
but since the 'audiophile' term popped up here

what do you (norm et all) think are the CLOSEST boomboxes to 'audiophile'

for me its the S90, tele studio and the aiwa950 --
ALL at low volumes

 

[mellymelsr]

slightly off topic
but since the 'audiophile' term popped up here

what do you (norm et all) think are the CLOSEST boomboxes to 'audiophile'

for me its the S90, tele studio and the aiwa950 --
ALL at low volumes

...I would add the RX7700 and the M9994k to that list...at low levels...just my 2 cents

 

[redbenjoe]

about the 7700 and the 9994 --except that the first 3 -
seem to have the most detailed tweets

ooops -- forgot the pioneers
and for a 'modern day' box --the panny707 is 'audiophile'

 

[Radio raheem]

melly that m70 looks way cool certainly better than all the rest i have seen whats an rx7700 hope its not the box i had as it sounded way shiat

 

[Superduper]

Inneresting question Ira. Someday, I'm gonna actually do a distortion test to put this to bed once and for all.

Any audiophile grade amplifier would want total harmonic distortion levels to be in the .025% to .05% range or so. I don't think any would want to be above .1%. For example, my Marantz 2500 receiver rates 250wpc RMS into 8ohms @ .05% THD. My Pioneer SX-1980 rates 270wpc RMS into 8ohms @ .03% THD.

Now, the JVC RC-M70 is rated at 7.0 wpc RMC into 8ohms @ 10% total harmonic distorion. THAT'S TEN FRIGGIN PERCENT guys, compared to audiophile levels of .025% or 4000 percent higher. Yes, that is NO mistake, 4000 percent higher. The RC-M90 is even more deceptive NOT advertising it's FTC ratings. Rather, choosing to use the Music Power garbage rating. By my estimation, it's more like 9wpc into 8ohms @ 10% THD which is a dismal rating.

Now, it should be noted that even the Pioneer SX-1980 can produce significantly more distortion when powered higher than the rated power output. While it's rated at 270wpc, I have read of tests results where they can produce 300wpc before clipping. Needless to say, the distortion is rated at a particular power output so it's probably going to be higher. Nevertheless, few speakers would actually survive 270wpc and any amount of clipping at that point could just about blow the speakers to bits. In real life, we operate them at much more reasonable listening levels and anything above 10 to 20wpc (actual RMS) with efficient speakers is likely going to be painful on the ears. Literally.

If we were to listen to our boomboxes at lower listening levels, then distortion could be much lower. Which boombox will perform more like a hifi? Love to give you a single candidate answer but I really think it's going to be in the ear of the beholder. For me, what I'd like to look for in a boombox for audio quality purposes are:

(1) reasonable volume overhead at 1/2 or below on the volume dial. (higher than this often means higher distortion).
(2) responsive tonal controls for greater adjustability of tonal curve.
(3) features accessory inputs (what hifi wouldn't allow you to hook up a CD or other audio input device?)
(4) Crisp clear highs. Piezo tweeters need not apply.
(5) Good vocals. "Titanic" just wouldn't be the same without it.
(6) Decent bass. Almost too much to ask for in a small machine, but we can hope. At the very least, it shouldn't be muddy.

I'll chime in on sound quality analysis of different models at a later time. Detailed analysis at the current time would be beyond the scope of this thread and a total hijack.