Bose 901 VI, havent found the right amp - Page 8 - AVS Forum | Home Theater Discussions And Reviews
Baselworld is only a few weeks away. Getting the latest news is easy, Click Here for info on how to join the Watchuseek.com newsletter list. Follow our team for updates featuring event coverage, new product unveilings, watch industry news & more!



Forum Jump: 
Reply
 
Thread Tools
post #211 of 222 Old 05-15-2015, 05:24 AM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 13,566
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked: 3858
Quote:
Originally Posted by dsrussell View Post
They have 4-inch drivers, if memory serves me, and had shocking bass response, which is based upon their "active equalizer" module.
They will go decently low, though certainly not to 30Hz, as the driver Fs is 80Hz. EQ'd or not they simply cannot go low with any authority, no matter how much power they're given. The displacement (Vd) of the 4.5 inch Bose driver is 20cc. That makes the displacement of all nine drivers 180cc. A ten inch sub driver with a modest 10mm xmax has a Vd of 350cc.

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.
Bill Fitzmaurice is offline  
Sponsored Links
Advertisement
 
post #212 of 222 Old 05-15-2015, 11:17 AM
AVS Special Member
 
dsrussell's Avatar
 
Join Date: Nov 2009
Location: Corona, CA.
Posts: 5,606
Mentioned: 66 Post(s)
Tagged: 1 Thread(s)
Quoted: 2143 Post(s)
Liked: 2896
Quote:
Originally Posted by Bill Fitzmaurice View Post
They will go decently low, though certainly not to 30Hz, as the driver Fs is 80Hz. EQ'd or not they simply cannot go low with any authority, no matter how much power they're given. The displacement (Vd) of the 4.5 inch Bose driver is 20cc. That makes the displacement of all nine drivers 180cc. A ten inch sub driver with a modest 10mm xmax has a Vd of 350cc.
Not surprisingly, I no longer have the printed frequency graphs, but I do remember them hitting somewhere in the mid 30 Hz range or a bit lower, before dropping steeply. I actually do have the purchase receipt from 1976 … go figure. But these little puppies were impressive with their bass response for such a small speaker. And I did buy these back in the day when Bose actually published specifications … to an extent (not that I would trust the veracity of those published specs). BTW, you're right again (are you ever wrong?). I just looked at my old manual (yep, still have that too), and they are 4-1/2 inch drivers.

The key to the 901s was proper setup (which was a tremendous headache) and driving them with a very powerful amplifier. When Bose offered me a 60 percent discount on their current 901s (since they couldn’t/wouldn't fix -- re-cone/re-edge -- that old of a speaker), I decided to go in a different direction. Smart move on my part .

Music area: Magnepan 3.6, McIntosh MC2205 amp & C48 preamp, SVS SB13-Ultra, Oppo BDP 95, dbx 3BX, and assorted equipment.
Movie area: EMP Tek E5Bi (were rebadged to R5Bi), RBH/EMP Tek R55Ti, PSA S3000i, Denon X2000, Oppo BDP 83.
dsrussell is offline  
post #213 of 222 Old 05-15-2015, 12:10 PM
AVS Addicted Member
 
Bill Fitzmaurice's Avatar
 
Join Date: Nov 2009
Location: New Hampshire
Posts: 13,566
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 3 Post(s)
Liked: 3858
Quote:
Originally Posted by dsrussell View Post
Not surprisingly, I no longer have the printed frequency graphs, … .
This is a Series IV, with EQ.
http://www.billfitzmaurice.info/images/Templates/charts/Bose901.jpg

Bill Fitzmaurice Loudspeaker Design

The Laws of Physics aren't swayed by opinion.

Last edited by Bill Fitzmaurice; 05-15-2015 at 12:16 PM.
Bill Fitzmaurice is offline  
post #214 of 222 Old 05-15-2015, 12:27 PM
Advanced Member
 
Peterc613's Avatar
 
Join Date: Apr 2011
Location: Van Nuys, CA
Posts: 934
Mentioned: 28 Post(s)
Tagged: 0 Thread(s)
Quoted: 410 Post(s)
Liked: 572
Pick up a pair of used Adcom GFA 555II's and run them bridged as monoblocks. They last forever and you can have them bench checked and replaced the 4 main capacitors for about $30 each if necessary. A lot of people modify them to perform as well as a Bryston and other way more expensive amps.

The ADCOM GFA-555 II is among the world's greatest audio power amplifiers of all time. It was designed by the legendary Nelson Pass, whose Pass Labs amplifiers today sell new for five figure price tags. Considering that you can get a used GFA-555 II on craigslist for about $250 - $350, it would be hard to find a better bargain for high-end amplification.


RATED POWER:

200w x 2 @ 8 ohms .04% THD
325w x 2 @ 4 ohms .04% THD
600w x 1 @ 8 ohms .09% THD (bridged)
850w x 1 @ 4 ohms .09% THD (bridged)

Stable to 2 ohm loads
No fan


TESTED POWER

While only rated for 200 watts per channel into 8 Ω, it easily put out 260 watts from each channel simultaneously at only 0.007% THD into 8 Ω. Measured with tone bursts, it easily put out an undistorted 370 watts per channel into 8 Ω.


That's about $700+ total for two mono block legendary amplifiers putting out 600w to 850w per channel


http://www.stereophile.com/content/a...-atkinson-1990

http://www.kenrockwell.com/audio/adcom/gfa-555-ii.htm

http://www.audioreview.com/cat/ampli...6_1583crx.aspx


-------------------------------------


BTW, I ised to have Bose 901's with a Phase Linear Amp and PreAmp back in the day. People on AVS like to bash the Bose 901's but I liked the big wide sound field they created. Plus frankly, I was young and hadn't heard anything better. That being said, I have to agree that they really do sound distorted and you can have the same effect AND accurate sound.

I sold my 901's once I discovered Magnaplanars and electrostats and other dipolar speakers. They easily create the same wide sound stage but without all the distortion inherent to the Bose 901 design. When you bounce sound off a wall you roll off and muddle the sound because you're basically listening to 1st and 2nd order room reflections without the direct waveform from the speakers. Yes, the Bose EQ unit tries to put back what was lost and get rid of the aberrations that were created, but it's not the same as just reproducing the original signal.

Used Magnapan speakers can be picked up on audiogon for very reasonable prices. There's a pair of MG III's listed right now for $900. Give them a listen and you's never go back to Bose ever again.

http://app.audiogon.com/listings/pla...35-milpitas-ca
Peterc613 is offline  
post #215 of 222 Old 05-15-2015, 12:36 PM
AVS Special Member
 
dsrussell's Avatar
 
Join Date: Nov 2009
Location: Corona, CA.
Posts: 5,606
Mentioned: 66 Post(s)
Tagged: 1 Thread(s)
Quoted: 2143 Post(s)
Liked: 2896
Quote:
Originally Posted by Bill Fitzmaurice View Post
This is a Series IV, with EQ.
http://www.billfitzmaurice.info/images/Templates/charts/Bose901.jpg
As usual, thanks a lot, Bill.

Music area: Magnepan 3.6, McIntosh MC2205 amp & C48 preamp, SVS SB13-Ultra, Oppo BDP 95, dbx 3BX, and assorted equipment.
Movie area: EMP Tek E5Bi (were rebadged to R5Bi), RBH/EMP Tek R55Ti, PSA S3000i, Denon X2000, Oppo BDP 83.
dsrussell is offline  
post #216 of 222 Old 05-15-2015, 12:48 PM
AVS Special Member
 
dsrussell's Avatar
 
Join Date: Nov 2009
Location: Corona, CA.
Posts: 5,606
Mentioned: 66 Post(s)
Tagged: 1 Thread(s)
Quoted: 2143 Post(s)
Liked: 2896
Quote:
Originally Posted by Peterc613 View Post
BTW, I ised to have Bose 901's with a Phase Linear Amp and PreAmp back in the day. People on AVS like to bash the Bose 901's but I liked the big wide sound field they created. Plus frankly, I was young and hadn't heard anything better. That being said, I have to agree that they really do sound distorted and you can have the same effect AND accurate sound.

I sold my 901's once I discovered Magnaplanars and electrostats and other dipolar speakers. They easily create the same wide sound stage but without all the distortion inherent to the Bose 901 design. When you bounce sound off a wall you roll off and muddle the sound because you're basically listening to 1st and 2nd order room reflections without the direct waveform from the speakers. Yes, the Bose EQ unit tries to put back what was lost and get rid of the aberrations that were created, but it's not the same as just reproducing the original signal.

Used Magnapan speakers can be picked up on audiogon for very reasonable prices. There's a pair of MG III's listed right now for $900. Give them a listen and you's never go back to Bose ever again.

http://app.audiogon.com/listings/pla...35-milpitas-ca
Ahhh, yes. Youth! Peter, you and I have a very similar story concerning speakers after the 901s . The 901s, not nearly as accurate and pristine as ESLs and Planar-magnetics (nor with the incredible high end and depth of soundstage), gave one a soundstage that spanned the entire wall, which was difficult to forget. After hearing full panel ESLs (Martin Logan) several decades ago, I knew that was the new direction I would be heading sooner or later. I guess I can thank the 901s for that .

Music area: Magnepan 3.6, McIntosh MC2205 amp & C48 preamp, SVS SB13-Ultra, Oppo BDP 95, dbx 3BX, and assorted equipment.
Movie area: EMP Tek E5Bi (were rebadged to R5Bi), RBH/EMP Tek R55Ti, PSA S3000i, Denon X2000, Oppo BDP 83.
dsrussell is offline  
post #217 of 222 Old 08-18-2015, 06:37 PM
Member
 
Join Date: Aug 2015
Posts: 20
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 8 Post(s)
Liked: 0
Hey guys so my dad had an old pair of 901s laying around (along with the equalizer he used with it). We seem to have thrown out the amplifier / receiver component for it and Im lookin to get it setup again. Im trying to stay around $300 or so if thats even possible? I got told today by some guy who knew about these that I could use a receiver with "Tape 1" and "Tape 2" RCA slots and this would work fine...If these are a thing, which do you suggest? Or what would be a better alternative for not so much $?
Thanks
eliteage is offline  
post #218 of 222 Old 08-19-2015, 11:47 AM
AVS Special Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 9,260
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 1627 Post(s)
Liked: 1153
You need a receiver with a "tape loop". There are probably some still around, but they are rare on new components simply because so few people use tape recorders any more. That feature has been de-featured on most devices. If it is a stereo system, look to a stereo receiver, or integrated amp, or get an older (used) receiver with a tape loop.

Other alternatives are a preamp, or receiver with preamp outputs, and separate power amp. That is typically more expensive but you may find deals on used components.

What is your budget?

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
post #219 of 222 Old 10-13-2015, 08:39 AM
Newbie
 
skippie17700's Avatar
 
Join Date: Sep 2011
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 0
I have my Bose 901 setup with the Bose 1800 v.2 amp, 2x200 Watt/8 Ohm and they sound AMAZING.

For all the critics around here, listen to a good combination first 901/amp before spitting out crap. They are not perfect, what speaker is in fact.
Even speakers worth thousands are not perfect, but you paid alot of money for them.

I may say that i'm glad i bought Bose 901 they give me the sound i need, and YES, there is a smooth, deep, warm base coming out of the 901. Amazingly deep.
My cousin came to visit me a few years ago and he said that he never heard such a sound.

So for the critics amount you all : First listen to them in the right combination, but i guess you never did.
skippie17700 is offline  
post #220 of 222 Old 10-13-2015, 08:40 AM
Newbie
 
skippie17700's Avatar
 
Join Date: Sep 2011
Posts: 2
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
Liked: 0
I have my Bose 901 setup with the Bose 1800 v.2 amp, 2x200 Watt/8 Ohm and they sound AMAZING.

For all the critics around here, listen to a good combination first 901/amp before spitting out crap. They are not perfect, what speaker is in fact.
Even speakers worth thousands are not perfect, but you paid alot of money for them.

I may say that i'm glad i bought Bose 901 they give me the sound i need, and YES, there is a smooth, deep, warm base coming out of the 901. Amazingly deep.
My cousin came to visit me a few years ago and he said that he never heard such a sound.

So for the critics amongst you all : First listen to them in the right combination, but i guess you never did.
skippie17700 is offline  
post #221 of 222 Old 11-20-2015, 07:27 PM
Newbie
 
Join Date: Nov 2015
Posts: 1
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Liked: 0
On the experience of 901

I've read through this entire thread. I get it, even the animosity and polarization of view. Here is a view of the 901 which hopefully transcends this and at the same time adds a bit of information to multiple comments.

I first met these guys in 1973 where I lived in a student room in the ymca at clemson university,this ymca serving as the student union. My first impression of the 901s was that I thought the beginning of the end of days was upon us. I did not know I was listening to a "stereo". I was in the room next door to a guy who was running his system. Once I realized that the end of days was only a stereo coming through my walls I visited next door ( new to the place, I had not met my neighbor). Turns out he had a pair of 901s facing the wall which joined our two rooms. He was using a phase linear amplifier for his primary amplification and another amp (dynaco?) running two advent or dyanco 35s for the back wall sound. His source was a reel to reel tape playing classical choral and organ music. The angelic choir I had heard was real...hi-fi. Later he played emerson lake and palmer's lucky man. I had never heard anything like it.

I've had a fetish for these speakers every since. He originally sold me his pair when he went off to a graduate program. I've had three or four pair since then. Almost have had these guys in various incarnations going almost forty years. I've never had audiophile amps, a few marantz and onkyos. But I have had them in more places than you can imagine. These set ups have ranged from the best acoustic environment possible to an airstream camper (which totally rocked). Currently I have a series 6 pair at a remote cabin in the virginia mountains. No neighbors and I frequently move them out onto the deck and rock an entire valley with music. At home I have an old series 1 which has a blown equalizer. Contacted Bose recently and they said they could not repair the equalizer but would accept my speakers and equalizer in return for a new series 6 for $599. Gonna do it. I'm sixty three now and no longer possess audiophile ears, if I ever did. But, the bose are like a voluptuous woman who over the years never fails to excite. Not much science in that, but there it is.
jkzappa is offline  
post #222 of 222 Old 11-20-2015, 10:25 PM
AVS Special Member
 
DonH50's Avatar
 
Join Date: Feb 2010
Location: Monument CO
Posts: 9,260
Mentioned: 22 Post(s)
Tagged: 0 Thread(s)
Quoted: 1627 Post(s)
Liked: 1153
Quote:
Originally Posted by skippie17700 View Post
I have my Bose 901 setup with the Bose 1800 v.2 amp, 2x200 Watt/8 Ohm and they sound AMAZING.

For all the critics around here, listen to a good combination first 901/amp before spitting out crap. They are not perfect, what speaker is in fact.
Even speakers worth thousands are not perfect, but you paid alot of money for them.

I may say that i'm glad i bought Bose 901 they give me the sound i need, and YES, there is a smooth, deep, warm base coming out of the 901. Amazingly deep.
My cousin came to visit me a few years ago and he said that he never heard such a sound.

So for the critics amount you all : First listen to them in the right combination, but i guess you never did.
I have heard Bose 901's driven by the 1800. And a Phase Linear 700. And by Audio Research, Krell, McIntosh, Perreaux, Levinson, etc. amps (and front ends). In many different rooms. And many iterations through the years. I do not like them but a lot of folk do. My reasons have been posted before, so I won't repeat them, but have nothing to do with what drives them. Be careful before condemning a class of people who do not agree with your preferences.

"After silence, that which best expresses the inexpressible, is music" - Aldous Huxley
DonH50 is offline  
Sponsored Links
Advertisement
 
Reply Speakers

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page


Forum Jump: 

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off