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Old 5th January 2017, 03:15 AM   #21
chrisb is offline chrisb
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Originally Posted by davesbimmer View Post
Okay, the reason I am not continuing to discuss the single driver is because I have a solid state amp. Others have advised me that that is problematic because of high output impedance.....
Let me call BS to that - I've heard drivers such as the Alpairs, TangBands and several models of Fostex work just fine with SS amps ranging from Nelson Pass's ACA, through at least half a dozen models of class D, chip amps such as TomC's wonderful LM 3886DR and Modulus86, and Denon, Marantz and Onkyo surround receivers. Really, there are too many candidates to list - that's just a few that I've heard over the past 5 yrs or so that stand out.

Do all of these combinations sound identical- no
Is there a single absolute, objective, double blind test champion best for any particular choice of driver and aesthetically acceptable enclosure? Probably not

That said, for all that a smaller FR driver such as the A7.3 can do very well, there are valid concerns if trying to use any of them beyond their SOA - hence the recommendations for high-passing them and using supporting mid-woofers. In other words, a 2-way system, albeit crossed over lower (circa 200 - 300) than when using a 3/4" dome or ribbon . Absent dogma, all are valid approaches when well executed.

Last edited by chrisb; 5th January 2017 at 03:19 AM.
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Old 5th January 2017, 06:41 PM   #22
silverhairbp is offline silverhairbp  United States
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I've got to agree with Chrisb. Mostly (haven't heard a Class D I really like., yet.). I use all Herron Audio electronics. The solid state M1 amps work great on single driver speakers. Their price tag is a bit high for the pure DIY hobbiest market (~ $7,000US a pair), but their performance is, IMO, as good as there is. Teamed with A7.3 Pensils and good front-end equipment, it's hard to find a better single-driver full-range system. But that's just my opinion. YMMV.

I strongly agree with the suggestion of lf filtering on the A7.3. For a couple of reasons. First, regardless of which side of the debate you're on, there is a potential modulation issue with single fr drivers. Second, why jeopardize the driver by feeding it too much accidental bass?
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Old 5th January 2017, 07:14 PM   #23
chrisb is offline chrisb
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whew, great to have my musings seconded by another grey-haired (what's left of it) DIY wacko

and I say that with the utmost of affection, bp
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Old 6th January 2017, 01:16 AM   #24
davesbimmer is offline davesbimmer  Canada
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Nothing like stimulating conversation, especially for me who has been following these conversations without being able to decide if those that are talking really know what they are talking about. A7.3 and mid w for me in the biggest prettiest wood box I can make. Might have to have dead space just to make me feel better.

Thank you guys. now back to the IIHF junior final....Go Canada!!
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Old 6th January 2017, 02:21 AM   #25
chrisb is offline chrisb
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I think the community here could jointly compile a short list for your consideration. Who knows, there might even be some agreement as to methodology and candidates for the mid-bass drivers
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Old 6th January 2017, 03:20 AM   #26
silverhairbp is offline silverhairbp  United States
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Got plenty of silver hair. The important point, at my age, is there there is plenty of hair. I think that was also my moniker way back in the 90s on the basslist.

Still hoping to get up to Victoriaberg while I still can. Need to renew my passport.
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Old 6th January 2017, 03:44 AM   #27
silverhairbp is offline silverhairbp  United States
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Originally Posted by chrisb View Post
I think the community here could jointly compile a short list for your consideration. Who knows, there might even be some agreement as to methodology and candidates for the mid-bass drivers
I will share some of the experience I've had with bass and midbass drivers. But before this gets out of control, would you like to suggest some criteria? Maybe some price points?

And before we get too far along do you think we should check with Dave when he's available and up to it to see if this is consistent with the intent of this forum and working with Dave's approval.
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Old 6th January 2017, 06:17 AM   #28
chrisb is offline chrisb
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Dave will not be in any position to be near a keyboard anytime in the near future - i.e. several months yet, so having been the no longer silent partner in Planet10 for the past 15 yrs, I'll have to suffice as its surrogate official voice in the interim.

That self aggrandizement aside, I'm sure that any suggestions or personal observations on systems / combinations of mid / midbass drivers with the Alpair 7.3 that seem to be currently in discussion would be appreciated by DaveS * , the OP on this particular thread.

I, of course have my own opinions on the matter, on which Dave* & I have not always necessarily been in agreement.

* way too many Daves - in addition to davesbimmer, one of mr D's longtime personal friends has the same surname, as does one of my brothers in law, a well accomplished forum member, and the gentleman who signs the paycheck at my full time day job - it's enough to get a old guy like me all confused.
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Old 6th January 2017, 01:31 PM   #29
silverhairbp is offline silverhairbp  United States
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Chrisb - Thanks for the clarification. I didn't think Dave* (DD) was in his business venture alone, but didn't know the details.

If that's the case, where do we start the list of drivers? Do you want to start another thread and begin the discussion by suggesting some criteria? Maybe some parameters including cost, potential freq range of operation, required box size, blah, blah, blah?

Last edited by silverhairbp; 6th January 2017 at 01:36 PM.
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Old 6th January 2017, 04:52 PM   #30
chrisb is offline chrisb
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Well, if davesbimmer is still interested in the subject, I'd be inclined to say this is as good a place as any to continue, but migrating to the general FR section could be fine as well.

Note from the time stamp on my prior post above that I'm burning a bit at both ends, and apologize for the tone of recent weeks' rambling / OT posts.

Back to topic - if we can agree that this has evolved into discussion of a "FAST" type 2-way , I very much like the idea of the A7.3 with supporting 6 - 8" mid-woofers. The big A12PW /7.3 MTM is certainly a costlier way to go than most might want, but to be honest I've been using a very narrow range of mid-woofers for at least 10yrs now, that the floor should be opened up to conversations as to which size / brands/ models might be most suitable for this particular system.

I don't want to seem to have an "axe to grind" here - there's gonna be more than one approach that could work very well - however, as this thread is still within the commercial sector, I'd be remiss to not make suggestions from "our" own library and inventory
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