Budget bookshelf system for acoustic bass

Thanks for all your responses. As per Gmeuller I am really loking at monitors with 6.5" drivers not mini monitors. Cabinets in this range, either sealed or front ported are small enough for my bookshelves.

Also, I'm a bit confused about frequency response. I suppose there must be quite a difference between specs, measured response and room response. For instance the NHT SB3 is quoted to go down to 39hz and was measured at -3db at 40hz by Stereophile. The PSB B25 is quoted to go down to 45hz and measured about -5db at 40hz by Stereophile. Would Pabelson argue that -3 to 5- dB will be perceived as a major dorp off and that the response needs to be near flat at the desired frequency?
Thanks much, PDenni

And another thing I was wondering - The Classik is rated at 75 watts into 4 ohms. I know small sealed enclosures are less effeicient than larger ported enclsures but I don't play music loud. What kind of sensitivity would a speaker need to acheive modest volumes in a medium sized room with the Classik?
Thanks again, PDenni

The Classik is rated at 75W into 4 ohms and half that into 8 ohms. Linn doesn't make a point of mentioning that, perhaps because all their speakers are 4 ohm rated. But a great many good speakers are rated at 8.

35 watts into 8 ohms is not a bad figure really if the amp is high-current, but you need a lot of juice for the kind of bass you would like. ( Especially if you're driving a monitor, because the cabinet's volume plays a big role in reinforcing low-frequency output. ) In your case I would want a speaker with at least an 89 dB/watt efficiency rating.

About ratings, though: there are specs, and then there is the real world. Room factors are generally compensated out ( or eliminated, as in an anechoic setting ) when specs are derived, in an attempt to give figures which can be compared across different models. However we then have to use the unit in an actual room, and each room has its own characteristics. Every room , depending on its size, shape and decoration, will cancel or reinforce different parts of the audio spectrum. These cancellations and reinforcements will vary again according to where you place the speaker in the room. ( C heck out the info I linked in my post above. )

Practically speaking ( ouch ), a speaker with measured frequency response of say -3 dB at 50 Hz may actually start to drop off noticeably below middle C, at 250 Hz, when it is played in a system. The bass notes may well be there, but at very low volume.

Linn deal with this by proposing extra amplification and active crossovers. This kind of setup can produce surprisingly loud, clean bass from a smaller speaker but clearly the additional gear is costly.

An efficient, solidly-built monitor with a simple crossover using high-quality parts, with your amp and for the price you want to pay... will take a little finding and may still not give you all you want, but careful placement will certainly help.

My musician brother has Paradigm Titans--inexpensive small monitors. One of his sons plays double bass and when he wants to learn a bass line he twists up the bass control on the HK505 integrated. This is fine for the purpose but musicians are rarely audiophiles. Perhaps I should mention that the apparent bass output of the Titans is boosted by having one of them on the floor against the wall...

Peter (I presume):

A speaker that really is 3-5 dB down at 40 Hz is going to give you very good bass performance. That's not the point. Speaker measurements depend very much on who's doing the measuring and how they're doing it. Manufacturers will always try to put their products in the best light. John Atkinson's measurements tend to be pretty generous, as well. If you look at the NRC measurements at http://www.soundstage.com, you'll see they're a bit more conservative. Tom Nousaine's measurements in Sound & Vision are even more conservative. None of them are wrong. But none of them really tell you what you will hear in your room. (And, obviously, they aren't comparable.)

I'm not anti-measurement, far from it. I'm just saying that what you want to know can't be known based on the information you have. What you want to know is, will I miss the bass with these monitors? And the only way to know that is to try one or two out.

Full size acoustic 4 string basses share the same low/open E string primary with that of full size electric basses (a bit higher than 41 HZ).

A full size 5 string bass (low/open string tuned to B) goes down to 31-32 Hz.

Other bass designs exist (a sub/concert bass to name one), but I doubt they come up often.