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Multi-Way Conventional loudspeakers with crossovers

How can I make this design more SQtastic (yes I made it up)
How can I make this design more SQtastic (yes I made it up)
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Old 31st May 2005, 04:00 PM   #21
Audiophilenoob is offline Audiophilenoob  United States
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Quote:
Originally posted by johninCR


I wouldn't. I'd use something much smaller and more economical.
why?????




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Old 31st May 2005, 04:03 PM   #22
Audiophilenoob is offline Audiophilenoob  United States
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Quote:
Originally posted by Variac
Well, one thing people mentioned was not to bother getting superhigh power amps, so thats useful information. Also, that the drivers you are interested in aren't easily available/or are unavailable. This is also usable info. Some of the other comments are opinion, and that's always a variable and shows that there isn't unaminity, so at least shows that maybe some more study is a good idea. Take your time on the design. That's also part of the fun- considering different ideas and thinking aboout them.

The rest is because of the feandil link not too clever...

I just didn't really care... people who care about the link are too immature to help with my problem anyway...

the Lambdas I already have lined up ... already talked to john.... and unless the PR17 (madisound) is hard to find I don't see what's hard to get...

also I do understand the needlessness of the high power.... but when a QSC 2450 costs around $50 more than a 1450 on egay there's no reason to not pick one up
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Old 31st May 2005, 04:52 PM   #23
johninCR is offline johninCR  United States
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Quote:
Originally posted by Audiophilenoob


why?????

Primarily because of size. A bass horn for a 15" driver takes up a lot of space. With say 8" drivers your cab can essentially be a stack of much smaller horns and get tremendous efficiency, the benefit of line array dispersion, impressive power handling, and economical drivers work because the workload is spread over many drivers. With extension needed only down to 35hz the array can be done in a very small footprint and with corner loading it can be very small spacewise.
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Old 31st May 2005, 05:35 PM   #24
Audiophilenoob is offline Audiophilenoob  United States
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Quote:
Originally posted by johninCR


Primarily because of size. A bass horn for a 15" driver takes up a lot of space. With say 8" drivers your cab can essentially be a stack of much smaller horns and get tremendous efficiency, the benefit of line array dispersion, impressive power handling, and economical drivers work because the workload is spread over many drivers. With extension needed only down to 35hz the array can be done in a very small footprint and with corner loading it can be very small spacewise.
Yes... but a horn would give you no where near the midbass output of a 4 15's especially since each driver is already 98 db efficent... plus you would have to compromise with a crappier high Q driver for the horn... correct??

you could do a very wide dispersion horn but it wouldn't sound as clean as simple ported midbasses...

this is mostly for SQ purposes... I just like concert level SPL sometimes with uber SQ .... though I would only use the SPL occasionally

also the only thing I can think that would give promising "large sweet spot" results would be an array or ESL... I personally don't like the sound of ESL's... but am still considering it
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Old 31st May 2005, 06:17 PM   #25
johninCR is offline johninCR  United States
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Quote:
Originally posted by Audiophilenoob


Yes... but a horn would give you no where near the midbass output of a 4 15's especially since each driver is already 98 db efficent... plus you would have to compromise with a crappier high Q driver for the horn... correct??

you could do a very wide dispersion horn but it wouldn't sound as clean as simple ported midbasses...

this is mostly for SQ purposes... I just like concert level SPL sometimes with uber SQ .... though I would only use the SPL occasionally

also the only thing I can think that would give promising "large sweet spot" results would be an array or ESL... I personally don't like the sound of ESL's... but am still considering it
Who said anything about high Q drivers. 8 of these (93db, Qts .26 and only $22/ea) http://www.partsexpress.com/pe/showd...number=290-063
in a corner horn array will get you a sensitivity of over 110db from 60-300hz and over 105db from 40-500hz. Your 4 15's are only going to get you 104db of sensitivity and done properly the dynamics and presence of the horn would blow away the ported box in a narrower less intrusive cab.

The only advantage the 15's would have is low end potential, but you wanted to tune to 35hz.
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Old 31st May 2005, 06:40 PM   #26
Audiophilenoob is offline Audiophilenoob  United States
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Quote:
Originally posted by johninCR


Who said anything about high Q drivers. 8 of these (93db, Qts .26 and only $22/ea) http://www.partsexpress.com/pe/showd...number=290-063
in a corner horn array will get you a sensitivity of over 110db from 60-300hz and over 105db from 40-500hz. Your 4 15's are only going to get you 104db of sensitivity and done properly the dynamics and presence of the horn would blow away the ported box in a narrower less intrusive cab.

The only advantage the 15's would have is low end potential, but you wanted to tune to 35hz.
hmmm yes I do see your point...

I was thinking about horn loading in the midbasses... but everyone has been telling me it will destroy the SQ....

High efficency is good... but SQ is far more important to me... it just happened to be that one of the best midranges and the best midbass were uber efficent

I wanted to tune to 35 or 55hz... if I go the cheaper route (dropping the lambdas) I would just get a few tumults
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Old 31st May 2005, 08:02 PM   #27
planet10 is offline planet10  Canada
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How can I make this design more SQtastic (yes I made it up)
Quote:
Originally posted by Audiophilenoob
I'm not too interested in some isoteric Class A's cause I don't know if the money justifies the benefit... I will be finding out soon as I ordered a $3000 N.E.W Class A dual channel mono design amp... Early tests show know audible difference on the test speakers between that and the QSC 2450...
Goy a link to the N.E.W? That is a pretty modest price (at least for SS class A)

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Old 31st May 2005, 08:16 PM   #28
Audiophilenoob is offline Audiophilenoob  United States
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Originally posted by planet10


Goy a link to the N.E.W? That is a pretty modest price (at least for SS class A)

dave

unfortunately the ebay auction expired that I won...

I do remember when I had the model number being able to find a review of it but can't now... the preamp from N.E.W. was $4999 and I believe it was $5499 for the N.E.W amplifier... I paid $270 for it... $3000 was just me throwing out ridiculous MSRP's, I do believe the N.E.W I have was $5499 when it came out a couple years ago...


it's 2 channels... dual mono inside...

105 watts RMS bridged with 0.09% THD at 8 ohms...

maybe it's just me and I can't tell the difference between a 0.05% THD amp at full output and 0.1% THD amp at full output

not that the QSC would ever reach full output... so the true THD should be far lower... where I did have to push the Class A slightly...

the only downside to the N.E.W. thus far is it has a fixed gain ... not that it matters with an active setup... but still it sucks
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Old 31st May 2005, 09:18 PM   #29
Audiophilenoob is offline Audiophilenoob  United States
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Well tell me what you all would recommend on a $6000 budget?

the ability to get loud is important but as long as it can reach 100 db's with little/no distortion that's enough
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Old 31st May 2005, 09:44 PM   #30
planet10 is offline planet10  Canada
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How can I make this design more SQtastic (yes I made it up)
Quote:
Originally posted by Audiophilenoob
it's 2 channels... dual mono inside...

105 watts RMS bridged with 0.09% THD at 8 ohms...
And 25 W/channel in stereo?

Quote:
maybe it's just me and I can't tell the difference between a 0.05% THD amp at full output and 0.1% THD amp at full output
Given that THD does not correlate at all to what things sound like, i wouldn't worry too much.

dave
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