M90 first time

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cableguy

Member (SA)
I recently unpacked this M90 I bought and plugged it in, fired in a tape and let her rip. For anyone who has never heard one, it really is quite a HiFi blaster, nice low frequency, more than I expected anyways. Glad I have it.... good luck to those still looking, don't give up :-)
 

Superduper

Moderator
Staff member
:agree:

Agreed. There is a reason why it's so highly regarded and collectible. You just discovered first hand. Enjoy your M90!

BTW, there are many more boomboxes out there that sound great as well. For 1 piecers, you can't do much better than the M90. But the 3-piecers have many formidable contendors out there that'll give the M90 a run for it's money, if not flat out blowing it out of the water. The M90 is only 8.5wpc RMS.
 

Eddy

Member (SA)
cableguy said:
I recently unpacked this M90 I bought and plugged it in, fired in a tape and let her rip. For anyone who has never heard one, it really is quite a HiFi blaster, nice low frequency, more than I expected anyways. Glad I have it.... good luck to those still looking, don't give up :-)
I know this feeling. I remember receiving my M 90 . I don't think i unpacked something so fast like that M 90 :w00t:
I couldn't hear the sound of it fast enough :hmmm:
 

Fatdog

Well-Known Member
Staff member
One of these days I hope to know that same feeling. :yes: Congratulations on getting an M90! :-)
 

Fatdog

Well-Known Member
Staff member
MasterBlaster84 said:
Fatdog said:
One of these days I hope to know that same feeling. :yes: Congratulations on getting an M90! :-)
No M90 bobby? I thought for sure you must have an M90 by now. :hmmm: |-)
I'm not prepared to shell out the big bucks for it just yet. :-/
 

Radio raheem

Requiem Æternam
Superduper said:
:agree:

Agreed. There is a reason why it's so highly regarded and collectible. You just discovered first hand. Enjoy your M90!

BTW, there are many more boomboxes out there that sound great as well. For 1 piecers, you can't do much better than the M90. But the 3-piecers have many formidable contendors out there that'll give the M90 a run for it's money, if not flat out blowing it out of the water. The M90 is only 8.5wpc RMS.

Please reveill all as i havn't found any yet
 

Superduper

Moderator
Staff member
OK, I finally found it and the specs are 8.5wpc into 6 ohms @ 10% THD. Those are NOT great numbers and many boomboxes have much greater specs. The loudness (SPL) unquestionably is at least partially attributable to the 8 inch woofers since most of the large heavy hitters use small speakers. Previously, I expected that the RMS for the M90 to be approximately 9wpc. This is quite nearly in line with the specs I had in mind. The M70's 7.0wpc is not far behind but is pumped into 8 ohms. I guess that if put into 6 or even 4 ohms, would have similar or even better numbers but the amp could be overtaxed since that amp module is not rated for 4 ohm operation at 15vdc.

2r59khu.jpg
 

Radio raheem

Requiem Æternam
I guess you had better fly over then norm cuz boxes like the sharp 939 my m90 leavs for dust, i had a friend over a couple of days ago i ran the head to head test and he basically said there was no comparo and that my m90 was louder hands down just like he has heard all my other boxes and he agrees the m90 is the loudest no compertition and btw that spec sheat says 8.5w min, my dc33l is rated higher than that and we all know the m90 totally blows away the dc33l.
 

Gluecifer

Member (SA)
I discovered recently too that hearing an M90 for the first time is a truly magical and awe inspiring experience for any blast-afficionado, and then the genuine rapture of hearing all your favourite music on it becomes a daily pleasure one can't easily beat!



Rock On.
 

redbenjoe

I Am Legend
Gluecifer said:
I discovered recently too that hearing an M90 for the first time is a truly magical and awe inspiring experience

thats so true -- :-O :angelic: :angelic:
too bad there can only be ONE first time :-) :-)
 

oldskool69

Moderator
Staff member
cableguy said:
I recently unpacked this M90 I bought and plugged it in, fired in a tape and let her rip. For anyone who has never heard one, it really is quite a HiFi blaster, nice low frequency, more than I expected anyways. Glad I have it.... good luck to those still looking, don't give up :-)


Welcome to the site and congratulatins on getting an M90! :thumbsup: Though I wouldn't pass one they aren't the end all be all for me though by appearing on LL Cool J's album cover has cemented it as sort of the quentissential box to have.

They are wonderful sounding but as Superduper (a kindred spirit if you will) has stated, there are many out there, not necessarily in the same design concept, that will lay out an M90 sound wise and absolutely power wise. And I know it's a fact as I own some of the very boxes that will crush it.

That being said, whatever your reason for having one you are one of the lucky few that do. And the only thing to remember is that you have it for "your" reasons. If you just wanted this one...great! If you are collecting and sound is a major factor, keep an eye out for component sets. As you cruise the site, you'll see what I mean. See this thread for some examples of what Superduper says. :-D

http://www.boomboxery.com/forum/viewtopic.php?f=16&t=2774
 

Superduper

Moderator
Staff member
Rimmer36 said:
I guess you had better fly over then norm cuz boxes like the sharp 939 my m90 leavs for dust, i had a friend over a couple of days ago i ran the head to head test and he basically said there was no comparo and that my m90 was louder hands down just like he has heard all my other boxes and he agrees the m90 is the loudest no compertition and btw that spec sheat says 8.5w min, my dc33l is rated higher than that and we all know the m90 totally blows away the dc33l.

Tim, the specs are what they say it is, and they don't lie. BTW, all power ratings when advertised in true RMS rating fashion says minimum rms. The MAX rating is the deceptive one. The MIN rating is the reliable one. You need to understand The ad you see above was distributed by JVC and clearly shows the RMS ratings to be 8.5wpc. The RMS ratings are FTC specs, meaning standardized testing results meeting very strict testing guidelines. You cranked up the tape playback adjustment on the tape sections on your M90's so the output modules are getting a stronger input signal, which will make them play louder -- sort of like a boombox with all the bands of the graphic equalizer cranked all the way up. If you want even more power, then go ahead and swap out the speakers for a set of 4 ohm jobs. That'll really make your amps work hard. But look at 8.5wpc, it's already at 10% THD. Sure, maybe you can get it louder than that, but at what, 20%, maybe 50% THD? I don't consider any of these figures to be listenable levels, to be truthful. In my opinion, any audible distortion is unacceptable and the volume should be turned down so a level where distortion is not audibly perceptible. I don't care if you can measure it -- I just don't want to hear the distortion. On my home stereo, I can listen to 10 wpc even though it's rocking the house. On a boombox, 5wpc is too much and painful to listen to. No, no, not physically painful. You either know what I'm saying or you don't. Clean power is a pleasure to listen to. Distortion laden audio, no matter how soft or loud, makes me want to shut it down, pronto. To get the distortion levels below say, 1% or 2%, the power would probably have to be reduced to 5wpc or so. But speakers have a lot to do with it and 10 wpc into large home speakers will literally rock the house.

But I'm not going to get into another one of those M90's against the world arguments with you because I know how much you like the M90 and it'll be like trying to win an argument with a zebra on whether spots or stripes are better. The M90 is a good box. I'm just saying it's not the end all, be all.
 

alvinm

Member (SA)
I have sold a few boxes in an effort to maybe land an M90 one day...I'll pass up 3 piecers all day long for one...don't care how good they sound.

Awesome choice! :thumbsup:
 

oldskool69

Moderator
Staff member
Superduper said:
...But I'm not going to get into another one of those M90's against the world arguments with you because I know how much you like the M90 and it'll be like trying to win an argument with a zebra on whether spots or stripes are better. The M90 is a good box. I'm just saying it's not the end all, be all....


Norm, when I can get to California you and I are going to have a beer. :thumbsup: I am in FULL agreement with what you are speaking and have stated exactly the same thing eleswhere on the web and a few places here as well. :-D

It's one thing to see how loud a box can screech...it's another when it comes to quality of sound. And as far as power goes, I'll say it again, the useful range is what matters. When you start affecting the input levels you are not only driving the amp beyond design specifications, but the other circuits before it. So your distortion will come long before it reaches the amp chip itself. So what really happens is you double up your problems.

Now that being said I have two boxes that have different speakers than the originals, my PC-55 because the original woofers couldn't deal with the power as old as they were and gave up the ghost, and my Sanyo C9 whose speakers were so sorry related to the power it had someone at Sanyo should have been shot for installing them. But, here's the caveat...the resistance is the same as factory originals, so the amps are working like they always have. The materials are better and efficiency might be better. But there are no adjustments to the audio input or output stages whatsoever. :-D
 

Superduper

Moderator
Staff member
oldskool69 said:
...................But, here's the caveat...the resistance is the same as factory originals, so the amps are working like they always have. The materials are better and efficiency might be better. But there are no adjustments to the audio input or output stages whatsoever. :-D

Better speakers definitely makes a difference. The AN7145K(M) and AN7156N chips between the M70 and M90 are so similar that it's almost negligible. The M70 apparently uses 8 ohm speakers while the M90 uses 6 ohm speakers. The difference between these two boomboxes could well be in the speakers and the more complex tape assembly of the M90. Otherwise, both uses very similar amp structures in a BTL arrangement. 7wpc for the M70@8ohms vs 8.5wpc for the M90@6ohms: seems the power difference could easily be attributable to differences in speaker impedance.

I think it was Ira who said he hooked up his M70 to home speakers and drove those to very loud levels. The 3 piece boomboxes typically uses comparatively small speakers. Otherwise, from a power perspective, many 3 piecers have it over the M90 and with better drivers, it would be game over, check-mate.

But tell you what Oldskool69: There is one thing though where we differ on, and that is that I don't drink so if you are gonna come out, we are gonna have to make it a coca cola -- I mean, diet cola.. :lol: :lol:
 

Alf

Member (SA)
Gosh, I could read Norms posts all day! I agree though, not about the M90 because I have never heard one so I'll stay neutral there, but about distortion. The second I hear it I get sickened. Silence > distortion. That's my new sig... SWEET!
 

oldskool69

Moderator
Staff member
Superduper said:
...But tell you what Oldskool69: There is one thing though where we differ on, and that is that I don't drink so if you are gonna come out, we are gonna have to make it a coca cola -- I mean, diet cola.. :lol: :lol:

Works for me too!!! (I would have offered sweet tea but when I was stationed in Seattle-Tacoma Washington I was told sugar in tea is a crime out west. :lol: :lol: :lol: )
 
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