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Old 15th July 2008, 03:01 AM   #31
Jaanos is offline Jaanos  Australia
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Default Usher 8945P 7" / Peerless HDS 1" MTM

Hi,

So has anyone built the MTM version as of yet? I ask this as I am also very interested in a MTM or similar with a budget of around 1k.......
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Old 15th July 2008, 06:26 AM   #32
Jay_WJ is offline Jay_WJ  United States
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Location: Indiana
Default Re: Usher 8945P 7" / Peerless HDS 1" MTM

Quote:
Originally posted by Jaanos
Hi,

So has anyone built the MTM version as of yet? I ask this as I am also very interested in a MTM or similar with a budget of around 1k.......
A person is in the process of building this design as I said here:

http://www.diyaudio.com/forums/showt...98#post1524298
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Old 15th July 2008, 09:51 AM   #33
Jaanos is offline Jaanos  Australia
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Ok great, the design looks pretty much exactly what I am after!! but I am just a little sceptical building something that has never actually been 'heard' before if you know what I mean....

Do you think the MTM design will eliminate the need for a subwoofer when listening to music? Or am I beter off going with the TM design coupled with a seperate sub? I only say this as the above link refers to the TM slightly lacking in bass when compared to B&W's 802D's - at approx $12,000 a pair tho!!

Thanks in advance for any advice and please forgive my lack of knowledge......

CHEERS!!
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Old 15th July 2008, 10:39 AM   #34
sreten is offline sreten  United Kingdom
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Hi,

An MTM gives no more bass extension than an MT, it simply plays
louder and is more sensistive (albeit 4 ohms) in a x2 size box.

MT (sealed) + active subwoofer is the way to go for deep bass.
(Properly designing the sub will always give more extension
and more SPL capability in the low bass. If not done properly
this is not guaranteed, one can make a sub that goes too
loud (and this is hardly ever needed) but not deep enough.)

Having said that there are alignments for the MTM in a bigger box
(1.5 to 1.8 cuft) than can be tuned low (28Hz to 22Hz), and with
optimal placement to use room gain (i.e. well away from, and
unequal distance to, walls) surprising bass extension can be
available. This is also true of the MT but at lower levels.

Bass loudness curves indicate the louder it is the deeper it appears
to go, with the proviso it goes deep in the first place, but at modest
levels that bass extension is not easily heard.

TBH most people have no idea what they really need in terms of
maximum levels, bass extension, whatever. An MT is in all respects
better than an MTM except for annoying the neighbours. The extra
volume capability of an MTM may not be needed most of the time.

FWIW the extended bass alignments can sound too "light" to some
depending on the room match. a modicum of adjustable passive
line level bass boost in the low bass region can work very well.
(when combined with an overdamped alignment)

/sreten.
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Old 15th July 2008, 11:51 AM   #35
Jay_WJ is offline Jay_WJ  United States
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Good advice, sreten.
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Old 15th July 2008, 07:34 PM   #36
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Location: Wellington, New Zealand
Quote:
FWIW the extended bass alignments can sound too "light" to some
In my case, my speakers sound much more satisfying to me with the loudness switch on. Obviously something wrong in my setup in the 60 - 160Hz range I'm guessing. This has generally been the case in various rooms I've listened to the speakers. Room nodes, or just my hearing insensitvity down low could be the reason. Without the loudness, speakers tend to sound thin.... All I want is a bass guitar to not come "in or out" depending on the frequency being played

Well - something to address with the new speakers & placement.

David.
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