No sub = no bass... true? - Page 12 - diyAudio
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Multi-Way Conventional loudspeakers with crossovers

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Old 15th December 2011, 08:04 PM   #111
Magz is offline Magz  United States
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My wife has learned to love them. When I talk about some day getting an Infinity IRS-V system (four cabinets, eight feet high each), though, the love ends...
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Old 15th December 2011, 08:12 PM   #112
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can see what you mean...
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Old 15th December 2011, 10:14 PM   #113
AllenB is online now AllenB  Australia
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Quote:
Originally Posted by canonnica View Post
I would be very interrested in measuring the freq. response of my room. Do you have affordable tools to suggest?
This is not a worthwhile pursuit in this sense. The issues that befall different parts of the spectrum (etc.) are not necessarily related, and further, some sre speaker related, some are placement related and some are just room related. So I wouldn't put much stock in a 'generic' room curve.

If you could see what your speaker looked like anechoically and compare it with your specific room/placement/listening position then you'll start getting information that you can use. You'll just need a reasonably good mic and some software.

Then deal with the modes, the reflection based cancellations etc. etc. separately.
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Old 15th December 2011, 11:51 PM   #114
tnargs is offline tnargs  Australia
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Originally Posted by mr_push_pull View Post
....I have two good (commercial) speakers that are advertised to go down to 35Hz (anechoic -3dB I'm assuming?).
If that's all it says, you can't assume anything, not even that 35Hz is the right number. It could be -6dB, or -10dB is common too.
Quote:
they are large (19l) bookshelves, bass reflex boxes. ....the in-room response of my old speakers and the bass region showed a 10dB wide (~1 octave) null centered at ~150Hz. I'm wondering if a mono sub would fix anything?
If the new speaker bass drivers are not in the same location and same height as the old ones, you cannot assume anything about the old speaker measurement applying to the new ones.
Quote:
Originally Posted by mr_push_pull View Post
so what do you then when there is practically no window for placement due to a small room and common sense considerations? I'm at the place where WAF becomes PAF (personal acceptance factor).
You need subs! The more the better.
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Old 16th December 2011, 12:08 AM   #115
pski is offline pski  United States
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Quote:
Originally Posted by tnargs View Post
If that's all it says, you can't assume anything, not even that 35Hz is the right number. It could be -6dB, or -10dB is common too.
If the new speaker bass drivers are not in the same location and same height as the old ones, you cannot assume anything about the old speaker measurement applying to the new ones.
You need subs! The more the better.
+1

Subs are easier. The more the better is subjective. The +/- dB is always in real specifications.

Read up on bi-amp.

P

How big is your space?
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Old 16th December 2011, 12:32 AM   #116
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Quote:
Originally Posted by pski View Post
+1

Subs are easier. The more the better is subjective. The +/- dB is always in real specifications.

Read up on bi-amp.

P

How big is your space?
I guess the question is addressed to me. it's a 3x4 m room.
but what's biamping got to do with it?

tomorrow I'll take one of the woofers out to measure T/S parameters and do a sim to find theoretical bass response.
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Old 16th December 2011, 02:55 AM   #117
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In my pursuit to a subwoofed (!) solution, I have some hard times to determine my options. There's 3 scenarios: a full blown DIY project -but it's winter here and I don't have space for woodworking-, a subwoofer kit -These are not very diversified and I really don't know what the result would be- and of course a ready made product.

I'm tempted by the latter; I just can't wait, I'm more interred at listening mysic that building it.

People suggested many brands but no one mentionned about the Martin Logans? The Dynamo 700 seems pretty neat. Any thoughts about it?

Thanks,
Martin.
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Old 16th December 2011, 04:46 AM   #118
AllenB is online now AllenB  Australia
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Originally Posted by canonnica View Post
I just can't wait, I'm more interred at listening mysic that building it.
Then get yourself a reasonable woofer or three (size and cost are not the only concerns and you'd be surprised how far you can push those and still get reasonable results). Put it in any half reasonable sized closed box from another project and connect it/them to a stereo amp that you may have lying around. Now come up with a way to cut the highs, preferrably something you can adjust.

Then set about finding the right location/level/phase and crossover frequency for it.
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Old 19th December 2011, 03:44 PM   #119
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Originally Posted by RockLeeEV View Post
CSS Trio 12 sealed and linkwitz transform is probably all we need for music and no high pass filter is necessary - because music wouldn't likely bottom the driver.
That's interresting... Does the usage of a Linkwitz transform circuit eliminates the need for an active crossover (like in the typical plate-amps) or is it to compliment it?

I'm tempted in building my own simple sealed 2cu.ft. with their 12" driver and a matched Linkwitz circuit to extend its response I just wonder how that circuit will integrate with a plate-amp. And they're in Canada too...

Regards,
Martin.
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Old 19th December 2011, 03:56 PM   #120
AndrewT is offline AndrewT  Scotland
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The Linkwitz transform is an adjustment method to enable a designer/builder to obtain the desired low frequency performance.
It is a specialised high pass filter with adjustable F & Q. It has nothing to do with crossovers.

BTW,
the LF performance of a midrange driver could just as easily be adjusted.
Then you could incorporate a crossover using that adjusted F&Q to perform well with a simpler crossover.
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