Do Bose 901 series 1 speakers have crossovers?

[Klappco]

As Audioraven indicates, there is no crossover Haydn in the Series 1.

In have a pair, and I strongly suggest considering a recap of the EQ, as the electrolytic caps used in the EQ have likely drifted way out of spec.

Recapping the unit will bring it Bach into spec.

This made my tough day better. Thanks![emoji3]


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[Tom Bombadil]

Personally, I'd consider 6db pretty bloody tight given the output at 1w is roughly 80db+ (closer to 90 based on my personal measurements).

Perhaps.

But this +-6dB is not measured from "flat" but rather from the normal, expected output. If the 4.5" driver was expected to be down -6dB at 15KHz, then a driver was approved as long as it measured between 0dB to -12dB at 15KHz.

 

[toxcrusadr]

All right, we've discussed the price Liszt for drivers, but we're still waiting for the other Schubert to drop. I'm getting a little Straussed out.

 

[onwardjames]

As Audioraven indicates, there is no crossover Haydn in the Series 1.

In have a pair, and I strongly suggest considering a recap of the EQ, as the electrolytic caps used in the EQ have likely drifted way out of spec.

Recapping the unit will bring it Bach into spec.

I see what you did there. :thmbsp:

All right, we've discussed the price Liszt for drivers, but we're still waiting for the other Schubert to drop. I'm getting a little Straussed out.

Well, I have a fine set of Vandersteens at home, and once I leave work, I'll Rachman, in off I go to bed.

Phew, that stunk.

 

[Pio1980]

I see what you did there. :thmbsp:




Well, I have a fine set of Vandersteens at home, and once I leave work, I'll Rachman, in off I go to bed.

Phew, that stunk.

2/3 of a pun, what can you expect.

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[jdmccall]

I would think that if you are only using one driver, in multiples, in a loudspeaker system's design, that you could get by with a relaxed quality spec per driver as they will all tend to average out. And the more drivers, the merrier! Another example of Dr. Bose' wisdom and forsight! Same principle applied to the 901 regarding their alledged high distortion in the bass. The individual drivers are distorting at slightly different frequencies and so, will tend to cancel out to a degree. In a nutshell, there is a lot of upside to single driver designs, and also to single drivers "in multiples".

 

[kirk57]

2/3 of a pun, what can you expect.

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Agree that one was slightly Orff.

 

[kaplang]

Are the Bose 901 series 1 crossovers internal to the speakers or does the equalizer Handel the frequency separation for the speakers?

Thanks

Ask a aimple question and get a complicated answer. Several of them.

 

[nexus]

No crossover, but a rather drastic equalizer which could be argued was worse.

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agreed.

 

[nexus]

i know Bose made a deal out of the concept that small drivers in multiples cancel out their distortions and frequency dips and peaks.

i'm not sure i buy that really. in fact this goes to the old adage that if it was that great everybody would be doing it (and then there would be no need for Vandersteens or Wilsons and the like).

OTH, i do rather like the phasiness that comes from a few small drivers in an array (if done well).

 

[toxcrusadr]

i'm not sure i buy that really. in fact this goes to the old adage that if it was that great everybody would be doing it (and then there would be no need for Vandersteens or Wilsons and the like).

OTH, i do rather like the phasiness that comes from a few small drivers in an array (if done well).

You have a point...if all the drivers met a tighter spec (any given spec, take your pick) the overall sound should be higher quality, at least whatever portion of it relates to the spec. Distortion for example.

 

[Copa1934]

i know Bose made a deal out of the concept that small drivers in multiples cancel out their distortions and frequency dips and peaks.

i'm not sure i buy that really. in fact this goes to the old adage that if it was that great everybody would be doing it (and then there would be no need for Vandersteens or Wilsons and the like).

OTH, i do rather like the phasiness that comes from a few small drivers in an array (if done well).

So companies like Polk got it wrong too, using multiples of the same drivers to cover as broad a range of frequencies possible? Oh, and throwing in a passive radiator for good measure as well.

There are several companies that have used multiple drivers, heck look at line arrays, they have in excess of 20 or more drivers in a stack. They too have very specialized networks that adjust, among other things, the level of DB output for each speaker based on it's relative position in the array.

How many used only one driver in multiples, and 9 at that, I don't know. But there are speakers systems with fewer multiples and more. I'm sure that if someone sat down with a program like DATS they'd find drivers that were off spec from the others. Maybe more than some people would tolerate.

Let's face it, Bose was a Ravel (rebel). I tried. Sorry.

 

[nclh77]

All the Bose hate, all these years. Some of it, admittedly, self inflicted. "Best speaker in the world, regardless of price." Talk like this gets the gander of many, including myself. Funny, last man standing of the huge group of speaker sellers from the 60's, 70's and 80's is Bose. Everyone else has been bought out or folded. Bose no longer makes most of their money in consumer electronics. They have moved on.

 

[Copa1934]

All the Bose hate, all these years. Some of it, admittedly, self inflicted. "Best speaker in the world, regardless of price." Talk like this gets the gander of many, including myself. Funny, last man standing of the huge group of speaker sellers from the 60's, 70's and 80's is Bose. Everyone else has been bought out or folded. Bose no longer makes most of their money in consumer electronics. They have moved on.

Kind of like Harmon Kardon. They weren't the best liked company, yet today they OWN most of those well regarded companies. Funny how that works out.

 

[toxcrusadr]

Same way McDonalds got to be so big. Lowest common denominator + high volume + marketing and advertising.

But you know, the thread was about crossover networks. I'm not a Bose hater, it's more like apathy with slight disdain. I don't know why we can't resist flogging it. I hate myself. :sigh:

 

[nexus]

So companies like Polk got it wrong too, using multiples of the same drivers to cover as broad a range of frequencies possible? Oh, and throwing in a passive radiator for good measure as well.

There are several companies that have used multiple drivers, heck look at line arrays, they have in excess of 20 or more drivers in a stack. They too have very specialized networks that adjust, among other things, the level of DB output for each speaker based on it's relative position in the array.

How many used only one driver in multiples, and 9 at that, I don't know. But there are speakers systems with fewer multiples and more. I'm sure that if someone sat down with a program like DATS they'd find drivers that were off spec from the others. Maybe more than some people would tolerate.

Let's face it, Bose was a Ravel (rebel). I tried. Sorry.

actually Polk would be something of an exception as their drivers were tighter spec'd, but i see what you mean.

and for the record i'm not a Bose hater (at least of the 901).

i agree that too much has been made for too long of the Bose bashing etc. time to just accept them and move on....

 

[sregor]

A friend of mine was once employed by Bose to test drivers. They were shipped in by the truckload. Said he saw an invoice which stated that the 901 drivers cost $4 each. This was back in the 90s. The testing procedure was to test the output at 4 frequencies. As long as it measured to within + or - 6dB of the desired output level, it passed. He asked someone about why the criteria was so forgiving and was told that once they were in a box with 9 drivers and driven through the EQ, it really didn't make much difference unless they were far out of spec.

This is BS. Bose always (since the 70's) used computer testing for the drivers. And +/- 6 db is an absurd number. If nothing else, Bose's QC is extremely good.